With the appropriate adapter, 28 pin AT27256 to 24 pin socket on the A6
board and some wires coming from the other sockets to the adapter, it

work.

However, my preference is to try to maintain 'originality' and if there is

pin compatible EPROM, I would tend to do that first.



I'm interested in why yours has only 3 chips. What options do you have
installed? Mine has 001 (high stability frequency reference) and 002 (high
voltage output). I wonder if that makes a difference. I did not spend any
time with the manual looking at the issue of what chips were installed

what options. I don't think 001 would require a different firmware but I
suspect 002 might. However, I didn't see any mention of that in the parts
list.

Also, what is the serial number of your 3325A and the part number of your

board? I notice in the manual, several changes happened in the midst of
serial numbers having a 1748A prefix.



Joe



From: hp_agilent_equipment@...

[mailto:hp_agilent_equipment@...

Sent: Sunday, May 19, 2013 11:24 AM
To: hp_agilent_equipment@...

Subject: Re: [hp_agilent_equipment] Re: 3325A ROMS





Joe, Ron,

I've been following this thread for a while and took a look at my own
3325A, which as it turns out has 3 NEC 2332 ROMs. Only U1, U3, and U4
locations are populated.

Looking at the CS signal encoding table on the schematic, it looks to me
as though one could use a single device to replace all four by
connecting the CS1 and CS2 lines to the A12 and A13 pins, respectively,
of a 256K or 512K device, installed in the U1 position. For example,
the Atmel AT27C256R or AT27C542R are widely available under $2 and most
modern programmers can program them.

Do you see any reason why this would not work?

Dave

On 5/19/2013 8:01 AM, J. L. Trantham wrote:

Ron,



For the 3325A, since you are hoping to restore the unit and leave the

chips

in place permanently, I would think that you could get four TMS2532

since it is listed as a pin compatible EPROM, program the data from my

chips into those four chips and give that a shot.



The TMS2532 is available on theBay for under $3 ea (in quantity). I'd

to look at the data sheet to see if there are any other 'pin compatible'
chips for the TMS2532 (or TMS2532A). The TMSxxxx chips are a bit of a
problem to find a programmer that will program them. The BP Micro
programmers will do the job.



If you are not too far away, and I have some TMS2532's, maybe I could

divide

the data and program a set for you. Would love to find out if it worked.



Joe



From: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

[mailto:hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com> ] On Behalf Of ron_ck722

Sent: Saturday, May 18, 2013 11:38 PM
To: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

Subject: [hp_agilent_equipment] Re: 3325A ROMS





Hi Joe,

While specifically looking for long retention parallel I/O EEPROMs (most

at

the major distributers are 10 year serial I/O, I2C or SPI Atmels), I

two 100 year Greenliant EEPROMs at Mouser:

the $1.88 ea., 64 x 8, GLS29EE512 and

the $2.16 ea., 128k x 8, GLS29EE010,

both in the 32 pin TSOP that isn't too hard to wire to a larger header.
Probably best done carefully after they're programmed.

At that price, I'll buy 3 ea and some 28 pin headers, after I look for

Data

Sheet Gotchas.

Regards,

Ron

--- In hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com> , "ron_ck722"<anfra@...>
wrote:

Hi Joe,

Thanks. I've downloaded the file from Didier's website as a .txt.

I've visited the burner website you'd suggested. I should have received

sign-on link email from them.

I'll find a parallel I/O EEPROM and let you know what looks good before

do anything to it, like mounting it on a 24 pin header. If I can't find a
way to burn it inexpensively myself, I may accept your generous offer to
mail it and have you burn it.

That procedure I'd mentioned about picking an individual A6 ROM and

the CPU to step through each of its Addresses and observe its 8 Outputs
actually works. I was able to use the System Clock and even substitute an
external generator by cutting the SA CLK jumper. I even clocked it as

as 100 Hertz and watched it take 41 seconds for the bit pattern to

I could clock it at 1/2 Hertz and write the bit patterns down manually.

It

would only take 18 hours to write them down. Otherwise, I could use a PC
Parallel Printer Port if I could only find a PC with one.

I do appreciate your help.

My Best,

Ron




--- In hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com> , "J. L.

Trantham"<jltran@>

wrote:

I just uploaded the ROM images from my HP 3325A to Didier's site.



Hope this helps someone.



Joe

------------------------------------

Yahoo! Groups Links

------------------------------------

Yahoo! Groups Links

Dave,

When I read the SY2316A's coming from my 3335A, there were three chip select
lines and CS was 'active low' for all the lines on all the chips. I think
you have 2332 chips, if the manual is correct, and the two CS lines can be
'programmed' in any state you want. Therefore, you would need to make them
extra 'address' lines for the 28 pin chip. I guess the only thing you would
have to do is to make sure the data shows up in the right 'quadrant' based
on the CS lines, as you said. That would make the 'modification' much more
palatable, with no modification to the A6 board.

I'm still curious why U3 is empty on your A6 board. Have you tried to read
the contents of your ROM's and compare it to the contents of mine?

Also, according to the change sheets, there are several changes at several
locations in the midst of the 1748A serial numbers. I didn't notice
anything when I glanced through it to explain why one ROM would be missing.

I guess you could explain it if, indeed, U1 was an 8Kx8 such as the
MCM68764. I note yours is Rev. D. Mine is Rev.O. Otherwise, the part
number is the same. Perhaps either you or I misread the Rev. number. I
used a magnifying glass to look at mine.

How easy is it for you to pull yours out and recheck? Mine is mounted in
a rack and getting to the back is a chore but I have done it.

Also, if you look at the pin out of a MCM68764, it looks 'almost' pin
compatible with a 2332. with pin 21 being A12 and pin 20 being the (not)
chip enable (i.e. active low).

Therefore, I suspect your U1 is, in fact, an MCM68764. I had to lift the
label to see the part number on mine.

If true, then dividing the data in the 68764 into two equal parts should
allow someone to 'resurrect' their unit, assuming you could figure out which
half went where.

Joe



-----Original Message-----
From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...] On Behalf Of Dave Hills
Sent: Sunday, May 19, 2013 6:31 PM
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] Re: 3325A ROMS






On 5/19/2013 10:03 AM, J. L. Trantham wrote:

With the appropriate adapter, 28 pin AT27256 to 24 pin socket on the A6
board and some wires coming from the other sockets to the adapter, it

should

work.

I don't' think any wires from the other ROMs are required. It appears
that since the 2332's have "programmable" CS pins, each ROM is mask
programmed with different CS active states. That is, U1 is enabled with
CS=0 and CS2=0, U2 with CS1=1 and CS2=0, and so on according to the
schematic truth table, which is just to the left of the ROMs on the
drawing. My thinking is that connecting U1 Pin 20 and U1 Pin 21 to A12
and A13, respectively on a 27C256 EPROM, (or a 27C128, for that matter,)
will sequentially address 4K blocks without any connections to U2, U3,
or U4.

However, my preference is to try to maintain 'originality' and if there is

a

pin compatible EPROM, I would tend to do that first.



I'm interested in why yours has only 3 chips. What options do you have
installed? Mine has 001 (high stability frequency reference) and 002 (high
voltage output). I wonder if that makes a difference. I did not spend any
time with the manual looking at the issue of what chips were installed

with

what options. I don't think 001 would require a different firmware but I
suspect 002 might. However, I didn't see any mention of that in the parts
list.

First, a correction, U3 is empty, not U2 as I originally stated. S/N is
1748A, Opt. 1, Opt.2, A6 assembly is P/N 3325-66506, Rev.C.
Parts are date code 1984.

U1 has a label:
Rev. D 011
03325-19401

It is a ceramic part and appears to be an EPROM, not a ROM as U2 and
U4. My guess would be it is an 8Kx8, (64K,) which addresses both U1 and
U3's 4K memory blocks. This works out perfectly for U1 being a MCM68764
or compatible EPROM.

The PC business was exploding in 1984, and memory shortages were
common. They may have just used whatever they could acquire at the
time, rather than being related to specific hardware options. I know
that's what we did back then.

Also, what is the serial number of your 3325A and the part number of your

A6

board? I notice in the manual, several changes happened in the midst of
serial numbers having a 1748A prefix.



Joe



From: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

[mailto:hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com> ] On Behalf Of Dave Hills

Sent: Sunday, May 19, 2013 11:24 AM
To: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

Subject: Re: [hp_agilent_equipment] Re: 3325A ROMS





Joe, Ron,

I've been following this thread for a while and took a look at my own
3325A, which as it turns out has 3 NEC 2332 ROMs. Only U1, U3, and U4
locations are populated.

Looking at the CS signal encoding table on the schematic, it looks to me
as though one could use a single device to replace all four by
connecting the CS1 and CS2 lines to the A12 and A13 pins, respectively,
of a 256K or 512K device, installed in the U1 position. For example,
the Atmel AT27C256R or AT27C542R are widely available under $2 and most
modern programmers can program them.

Do you see any reason why this would not work?

Dave

On 5/19/2013 8:01 AM, J. L. Trantham wrote:

Ron,



For the 3325A, since you are hoping to restore the unit and leave the

chips

in place permanently, I would think that you could get four TMS2532

chips,

since it is listed as a pin compatible EPROM, program the data from my

two

chips into those four chips and give that a shot.



The TMS2532 is available on theBay for under $3 ea (in quantity). I'd

have

to look at the data sheet to see if there are any other 'pin compatible'
chips for the TMS2532 (or TMS2532A). The TMSxxxx chips are a bit of a
problem to find a programmer that will program them. The BP Micro
programmers will do the job.



If you are not too far away, and I have some TMS2532's, maybe I could

divide

the data and program a set for you. Would love to find out if it worked.



Joe



From: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

[mailto:hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com> ] On Behalf Of ron_ck722

Sent: Saturday, May 18, 2013 11:38 PM
To: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

Subject: [hp_agilent_equipment] Re: 3325A ROMS





Hi Joe,

While specifically looking for long retention parallel I/O EEPROMs (most

at

the major distributers are 10 year serial I/O, I2C or SPI Atmels), I

found

two 100 year Greenliant EEPROMs at Mouser:

the $1.88 ea., 64 x 8, GLS29EE512 and

the $2.16 ea., 128k x 8, GLS29EE010,

both in the 32 pin TSOP that isn't too hard to wire to a larger header.
Probably best done carefully after they're programmed.

At that price, I'll buy 3 ea and some 28 pin headers, after I look for

Data

Sheet Gotchas.

Regards,

Ron

--- In hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com> , "ron_ck722"<anfra@>
wrote:

Hi Joe,

Thanks. I've downloaded the file from Didier's website as a .txt.

I've visited the burner website you'd suggested. I should have received

a

sign-on link email from them.

I'll find a parallel I/O EEPROM and let you know what looks good before

I

do anything to it, like mounting it on a 24 pin header. If I can't find a
way to burn it inexpensively myself, I may accept your generous offer to
mail it and have you burn it.

That procedure I'd mentioned about picking an individual A6 ROM and

using

the CPU to step through each of its Addresses and observe its 8 Outputs
actually works. I was able to use the System Clock and even substitute an
external generator by cutting the SA CLK jumper. I even clocked it as

slow

as 100 Hertz and watched it take 41 seconds for the bit pattern to

repeat.

I could clock it at 1/2 Hertz and write the bit patterns down manually.

It

would only take 18 hours to write them down. Otherwise, I could use a PC
Parallel Printer Port if I could only find a PC with one.

I do appreciate your help.

My Best,

Ron




--- In hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com> , "J. L.

Trantham"<jltran@>

wrote:

I just uploaded the ROM images from my HP 3325A to Didier's site.



Hope this helps someone.



Joe



[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]



------------------------------------

Yahoo! Groups Links

------------------------------------

Yahoo! Groups Links

[Non-text portions of this message have been removed]

Ron,



I think placing a socket is almost required to be a 'member of the group' J.



I have placed sockets for the EPROM and all three Dallas chips in my 3458A.
Sure makes it easier to read and archive the cal constants when it gets back
from calibration and to upgrade the firmware when those are available. I
think of it as 'completing the design HP started but the bean counters got
in the way' J. Reliability is increased with chips soldered in but
serviceability is greatly improved with sockets.



However, if you subscribe to the 'leave no trace' theory, then, I guess, I
understand J.



The only time I've been tempted to disguise a modification is when replacing
the old board mounted aluminum can electrolytics that have 'interconnects'
between some of their multiple terminals to provide ground paths. However,
I've just mounted the replacement radial cap and added wires between
appropriate pads to account for the internal interconnects of the replaced
cap.



I still drive my 'first car', a 1970 Camaro that I bought new in 1970. It's
been through several 'renovations, most recently a 'frame off' restoration
with an entirely new engine and drive train. I couldn't resist the
performance upgrade. Passes everything except the gas station.



Can you give me any details of you ASCII to HEX converter? I'm a 'newbie'
when it comes to computer aided data manipulation.



I think that my U1 has the data from your U1 and U3 and my U2 probably has
the data from your U2 and U4, based on the truth table on the A6 schematic.




I'm not going to be in the shop for about a week but when I get back in
there, I'll see if I can find two TMS2532's, divide the data, and program
the two chips. I think you noted the part numbers of your four chips in an
earlier post and I'll label them accordingly.



Another option is to program two MCM68764's. However, I've not been able to
find them. It would appear that the MCM68766 would be a pin compatible
substitute and I can find them at just under $5 per chip.



Also, where are you? You may have told me but if so, I've forgotten.



Joe







From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...] On Behalf Of ron_ck722
Sent: Tuesday, May 21, 2013 12:18 AM
To: hp_agilent_equipment@...
Subject: [hp_agilent_equipment] Re: 3325A ROMS





Hi Joe,

That would be wonderful if you could program two 2532s and I can try them.
I'd found several NOS new ones on ebay for $4.50 each. I could
use yours, buy 2 or 3 for me or, better yet, send you money on PayPal to buy
2 plus spares, program 2 of them and mail them to me. I may
(sinfully) socket the board if that's allowed (see below).

I've used an ASCII to Hex converter to get the data you sent me in
nice orderly arrays. It's much more understandable, but I'd still need a
burner.

If I'd used an EEPROM, in a moment of insanity, I could always cut the top
off my bad 2332 and hide the new SOIC EEPROM inside. People have done
crazier things.

Since years ago, when I was into antique cars and was body-on restoring a 38
Packard, I became an OEM nut. I always prefer to restore any hardware to
original or near-original condition, even as far as ordering perfect
replacement running board treads, brake hoses or junction-free brake lines.
Try finding 15 feet of continuous steel brake line. Truck repair depots
still have them.

Regards,

Ron

--- In hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com> , "J. L. Trantham"
<jltran@> wrote:

Dave,

When I read the SY2316A's coming from my 3335A, there were three chip

select

lines and CS was 'active low' for all the lines on all the chips. I think
you have 2332 chips, if the manual is correct, and the two CS lines can be
'programmed' in any state you want. Therefore, you would need to make them
extra 'address' lines for the 28 pin chip. I guess the only thing you

would

have to do is to make sure the data shows up in the right 'quadrant' based
on the CS lines, as you said. That would make the 'modification' much more
palatable, with no modification to the A6 board.

I'm still curious why U3 is empty on your A6 board. Have you tried to read
the contents of your ROM's and compare it to the contents of mine?

Also, according to the change sheets, there are several changes at several
locations in the midst of the 1748A serial numbers. I didn't notice
anything when I glanced through it to explain why one ROM would be

missing.

I guess you could explain it if, indeed, U1 was an 8Kx8 such as the
MCM68764. I note yours is Rev. D. Mine is Rev.O. Otherwise, the part
number is the same. Perhaps either you or I misread the Rev. number. I
used a magnifying glass to look at mine.

How easy is it for you to pull yours out and recheck? Mine is mounted in
a rack and getting to the back is a chore but I have done it.

Also, if you look at the pin out of a MCM68764, it looks 'almost' pin
compatible with a 2332. with pin 21 being A12 and pin 20 being the (not)
chip enable (i.e. active low).

Therefore, I suspect your U1 is, in fact, an MCM68764. I had to lift the
label to see the part number on mine.

If true, then dividing the data in the 68764 into two equal parts should
allow someone to 'resurrect' their unit, assuming you could figure out

which

half went where.

Joe



-----Original Message-----
From: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

[mailto:hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com> ] On Behalf Of Dave Hills

Sent: Sunday, May 19, 2013 6:31 PM
To: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

Subject: Re: [hp_agilent_equipment] Re: 3325A ROMS






On 5/19/2013 10:03 AM, J. L. Trantham wrote:

With the appropriate adapter, 28 pin AT27256 to 24 pin socket on the A6
board and some wires coming from the other sockets to the adapter, it

should

work.

I don't' think any wires from the other ROMs are required. It appears
that since the 2332's have "programmable" CS pins, each ROM is mask
programmed with different CS active states. That is, U1 is enabled with
CS=0 and CS2=0, U2 with CS1=1 and CS2=0, and so on according to the
schematic truth table, which is just to the left of the ROMs on the
drawing. My thinking is that connecting U1 Pin 20 and U1 Pin 21 to A12
and A13, respectively on a 27C256 EPROM, (or a 27C128, for that matter,)
will sequentially address 4K blocks without any connections to U2, U3,
or U4.

However, my preference is to try to maintain 'originality' and if there

is

a

pin compatible EPROM, I would tend to do that first.



I'm interested in why yours has only 3 chips. What options do you have
installed? Mine has 001 (high stability frequency reference) and 002

(high

voltage output). I wonder if that makes a difference. I did not spend

any

time with the manual looking at the issue of what chips were installed

with

what options. I don't think 001 would require a different firmware but I
suspect 002 might. However, I didn't see any mention of that in the

parts

list.

First, a correction, U3 is empty, not U2 as I originally stated. S/N is
1748A, Opt. 1, Opt.2, A6 assembly is P/N 3325-66506, Rev.C.
Parts are date code 1984.

U1 has a label:
Rev. D 011
03325-19401

It is a ceramic part and appears to be an EPROM, not a ROM as U2 and
U4. My guess would be it is an 8Kx8, (64K,) which addresses both U1 and
U3's 4K memory blocks. This works out perfectly for U1 being a MCM68764
or compatible EPROM.

The PC business was exploding in 1984, and memory shortages were
common. They may have just used whatever they could acquire at the
time, rather than being related to specific hardware options. I know
that's what we did back then.

Also, what is the serial number of your 3325A and the part number of

your

A6

board? I notice in the manual, several changes happened in the midst of
serial numbers having a 1748A prefix.



Joe



From: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

[mailto:hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com> ] On Behalf Of Dave Hills

Sent: Sunday, May 19, 2013 11:24 AM
To: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

Subject: Re: [hp_agilent_equipment] Re: 3325A ROMS





Joe, Ron,

I've been following this thread for a while and took a look at my own
3325A, which as it turns out has 3 NEC 2332 ROMs. Only U1, U3, and U4
locations are populated.

Looking at the CS signal encoding table on the schematic, it looks to me
as though one could use a single device to replace all four by
connecting the CS1 and CS2 lines to the A12 and A13 pins, respectively,
of a 256K or 512K device, installed in the U1 position. For example,
the Atmel AT27C256R or AT27C542R are widely available under $2 and most
modern programmers can program them.

Do you see any reason why this would not work?

Dave

On 5/19/2013 8:01 AM, J. L. Trantham wrote:

Ron,



For the 3325A, since you are hoping to restore the unit and leave the

chips

in place permanently, I would think that you could get four TMS2532

chips,

since it is listed as a pin compatible EPROM, program the data from my

two

chips into those four chips and give that a shot.



The TMS2532 is available on theBay for under $3 ea (in quantity). I'd

have

to look at the data sheet to see if there are any other 'pin

compatible'

chips for the TMS2532 (or TMS2532A). The TMSxxxx chips are a bit of a
problem to find a programmer that will program them. The BP Micro
programmers will do the job.



If you are not too far away, and I have some TMS2532's, maybe I could

divide

the data and program a set for you. Would love to find out if it

worked.

Joe



From: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

[mailto:hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com> ] On Behalf Of ron_ck722

Sent: Saturday, May 18, 2013 11:38 PM
To: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

Subject: [hp_agilent_equipment] Re: 3325A ROMS





Hi Joe,

While specifically looking for long retention parallel I/O EEPROMs

(most

at

the major distributers are 10 year serial I/O, I2C or SPI Atmels), I

found

two 100 year Greenliant EEPROMs at Mouser:

the $1.88 ea., 64 x 8, GLS29EE512 and

the $2.16 ea., 128k x 8, GLS29EE010,

both in the 32 pin TSOP that isn't too hard to wire to a larger header.
Probably best done carefully after they're programmed.

At that price, I'll buy 3 ea and some 28 pin headers, after I look for

Data

Sheet Gotchas.

Regards,

Ron

--- In hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com> , "ron_ck722"<anfra@>
wrote:

Hi Joe,

Thanks. I've downloaded the file from Didier's website as a .txt.

I've visited the burner website you'd suggested. I should have

received

a

sign-on link email from them.

I'll find a parallel I/O EEPROM and let you know what looks good

before

I

do anything to it, like mounting it on a 24 pin header. If I can't find

a

way to burn it inexpensively myself, I may accept your generous offer

to

mail it and have you burn it.

That procedure I'd mentioned about picking an individual A6 ROM and

using

the CPU to step through each of its Addresses and observe its 8 Outputs
actually works. I was able to use the System Clock and even substitute

an

external generator by cutting the SA CLK jumper. I even clocked it as

slow

as 100 Hertz and watched it take 41 seconds for the bit pattern to

repeat.

I could clock it at 1/2 Hertz and write the bit patterns down

manually.

It

would only take 18 hours to write them down. Otherwise, I could use a

PC

Parallel Printer Port if I could only find a PC with one.

I do appreciate your help.

My Best,

Ron




--- In hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com> , "J. L.

Trantham"<jltran@>

wrote:

I just uploaded the ROM images from my HP 3325A to Didier's site.



Hope this helps someone.



Joe



[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]



------------------------------------

Yahoo! Groups Links

[Non-text portions of this message have been removed]



------------------------------------

Yahoo! Groups Links

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

Hi Joe,

No problem.

The new CPU is nicely socketed, just in case I ever want to try the old CPU, which may be only slightly boogered from my removing it. I'm so used to modern PCBs that don't take a lot of amateur rework without lifting pads. These old HP boards are pretty durable. As I was removing the CPU and 1 kHz keyboard clock 555 the hard way, with wick and a solder sucker, a couple of pins stayed behind and I had a devil of a time clearing the holes.

In 45 years with IC's I'm one of the few who'd never used a 555.

Sockets would seem at least a temporary requirement with any programmable device like an EPROM.

I also did the capacitor trick. I used to hide T0-3 oscillators inside old 12V vacuum tube car radio metal vibrator cans when vibrators weren't handy or available.

I tried unsuccessfully to download HEXED from one of the ROM hacker websites. I may be more newbie than you. They say a good translator should display HEX and the original ASCII characters together.

What I have now is a safe download, HxD from CNET. It puts everything in a nice table. I wanted to dump it onto an Excel spreadsheet but I'm having problems transferring more than 256 characters at a time. Lotta work. Takes 256 laborious passes.

I didn't tell you - I'm in Lacey WA. There aren't enough electronic distributors here. New habit of mail orders. Did you say you were in Florida?

If we start talking about $$$ we probably shouldn't do it in this forum. I'm trying unsuccessfully to migrate from anfra@... to ron.ck722@... Either is fine to trade details. I haven't tried my Yahoo mail yet.

I don't know how Google and Yahoo keep their trade secrets apart. When I worked a block away, their headquarters were across the street from each other. Couldn't tell them apart. I was reading an IEEE Spectrum article about Yahoo's up and coming first female Engineer, Marissa Meyer. Sent the article to our granddaughter. Next thing I know, Marissa's the CEO.

Had a 79 Camaro and a 79 DeVille at the same time. Big problem - spark plug #1 was inaccessible in both V8's, hidden behind the air conditioner heat exchanger until I figured out from the Packard - if I removed the right front plastic wheel well liner, a 5 minute job, it was absolutely a straight shot with an ordinary socket. No universal joint extender.

Same trick worked putting Amber front turn signal LED replacement bulbs in my 2009 Camry Hybrid.

I'll look at and for the MCMs.

Thanks for all your work and sage advice,

Ron



--- In hp_agilent_equipment@..., "J. L. Trantham" <jltran@> wrote:

Ron,



I think placing a socket is almost required to be a 'member of the group' J.



I have placed sockets for the EPROM and all three Dallas chips in my 3458A.
Sure makes it easier to read and archive the cal constants when it gets back
from calibration and to upgrade the firmware when those are available. I
think of it as 'completing the design HP started but the bean counters got
in the way' J. Reliability is increased with chips soldered in but
serviceability is greatly improved with sockets.



However, if you subscribe to the 'leave no trace' theory, then, I guess, I
understand J.



The only time I've been tempted to disguise a modification is when replacing
the old board mounted aluminum can electrolytics that have 'interconnects'
between some of their multiple terminals to provide ground paths. However,
I've just mounted the replacement radial cap and added wires between
appropriate pads to account for the internal interconnects of the replaced
cap.



I still drive my 'first car', a 1970 Camaro that I bought new in 1970. It's
been through several 'renovations, most recently a 'frame off' restoration
with an entirely new engine and drive train. I couldn't resist the
performance upgrade. Passes everything except the gas station.



Can you give me any details of you ASCII to HEX converter? I'm a 'newbie'
when it comes to computer aided data manipulation.



I think that my U1 has the data from your U1 and U3 and my U2 probably has
the data from your U2 and U4, based on the truth table on the A6 schematic.




I'm not going to be in the shop for about a week but when I get back in
there, I'll see if I can find two TMS2532's, divide the data, and program
the two chips. I think you noted the part numbers of your four chips in an
earlier post and I'll label them accordingly.



Another option is to program two MCM68764's. However, I've not been able to
find them. It would appear that the MCM68766 would be a pin compatible
substitute and I can find them at just under $5 per chip.



Also, where are you? You may have told me but if so, I've forgotten.



Joe







From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...] On Behalf Of ron_ck722
Sent: Tuesday, May 21, 2013 12:18 AM
To: hp_agilent_equipment@...
Subject: [hp_agilent_equipment] Re: 3325A ROMS





Hi Joe,

That would be wonderful if you could program two 2532s and I can try them.
I'd found several NOS new ones on ebay for $4.50 each. I could
use yours, buy 2 or 3 for me or, better yet, send you money on PayPal to buy
2 plus spares, program 2 of them and mail them to me. I may
(sinfully) socket the board if that's allowed (see below).

I've used an ASCII to Hex converter to get the data you sent me in
nice orderly arrays. It's much more understandable, but I'd still need a
burner.

If I'd used an EEPROM, in a moment of insanity, I could always cut the top
off my bad 2332 and hide the new SOIC EEPROM inside. People have done
crazier things.

Since years ago, when I was into antique cars and was body-on restoring a 38
Packard, I became an OEM nut. I always prefer to restore any hardware to
original or near-original condition, even as far as ordering perfect
replacement running board treads, brake hoses or junction-free brake lines.
Try finding 15 feet of continuous steel brake line. Truck repair depots
still have them.

Regards,

Ron

--- In hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com> , "J. L. Trantham"
<jltran@> wrote:

Dave,

When I read the SY2316A's coming from my 3335A, there were three chip

select

lines and CS was 'active low' for all the lines on all the chips. I think
you have 2332 chips, if the manual is correct, and the two CS lines can be
'programmed' in any state you want. Therefore, you would need to make them
extra 'address' lines for the 28 pin chip. I guess the only thing you

would

have to do is to make sure the data shows up in the right 'quadrant' based
on the CS lines, as you said. That would make the 'modification' much more
palatable, with no modification to the A6 board.

I'm still curious why U3 is empty on your A6 board. Have you tried to read
the contents of your ROM's and compare it to the contents of mine?

Also, according to the change sheets, there are several changes at several
locations in the midst of the 1748A serial numbers. I didn't notice
anything when I glanced through it to explain why one ROM would be

missing.

I guess you could explain it if, indeed, U1 was an 8Kx8 such as the
MCM68764. I note yours is Rev. D. Mine is Rev.O. Otherwise, the part
number is the same. Perhaps either you or I misread the Rev. number. I
used a magnifying glass to look at mine.

How easy is it for you to pull yours out and recheck? Mine is mounted in
a rack and getting to the back is a chore but I have done it.

Also, if you look at the pin out of a MCM68764, it looks 'almost' pin
compatible with a 2332. with pin 21 being A12 and pin 20 being the (not)
chip enable (i.e. active low).

Therefore, I suspect your U1 is, in fact, an MCM68764. I had to lift the
label to see the part number on mine.

If true, then dividing the data in the 68764 into two equal parts should
allow someone to 'resurrect' their unit, assuming you could figure out

which

half went where.

Joe



-----Original Message-----
From: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

[mailto:hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com> ] On Behalf Of Dave Hills

Sent: Sunday, May 19, 2013 6:31 PM
To: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

Subject: Re: [hp_agilent_equipment] Re: 3325A ROMS






On 5/19/2013 10:03 AM, J. L. Trantham wrote:

With the appropriate adapter, 28 pin AT27256 to 24 pin socket on the A6
board and some wires coming from the other sockets to the adapter, it

should

work.

I don't' think any wires from the other ROMs are required. It appears
that since the 2332's have "programmable" CS pins, each ROM is mask
programmed with different CS active states. That is, U1 is enabled with
CS=0 and CS2=0, U2 with CS1=1 and CS2=0, and so on according to the
schematic truth table, which is just to the left of the ROMs on the
drawing. My thinking is that connecting U1 Pin 20 and U1 Pin 21 to A12
and A13, respectively on a 27C256 EPROM, (or a 27C128, for that matter,)
will sequentially address 4K blocks without any connections to U2, U3,
or U4.

However, my preference is to try to maintain 'originality' and if there

is

a

pin compatible EPROM, I would tend to do that first.



I'm interested in why yours has only 3 chips. What options do you have
installed? Mine has 001 (high stability frequency reference) and 002

(high

voltage output). I wonder if that makes a difference. I did not spend

any

time with the manual looking at the issue of what chips were installed

with

what options. I don't think 001 would require a different firmware but I
suspect 002 might. However, I didn't see any mention of that in the

parts

list.

First, a correction, U3 is empty, not U2 as I originally stated. S/N is
1748A, Opt. 1, Opt.2, A6 assembly is P/N 3325-66506, Rev.C.
Parts are date code 1984.

U1 has a label:
Rev. D 011
03325-19401

It is a ceramic part and appears to be an EPROM, not a ROM as U2 and
U4. My guess would be it is an 8Kx8, (64K,) which addresses both U1 and
U3's 4K memory blocks. This works out perfectly for U1 being a MCM68764
or compatible EPROM.

The PC business was exploding in 1984, and memory shortages were
common. They may have just used whatever they could acquire at the
time, rather than being related to specific hardware options. I know
that's what we did back then.

Also, what is the serial number of your 3325A and the part number of

your

A6

board? I notice in the manual, several changes happened in the midst of
serial numbers having a 1748A prefix.



Joe



From: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

[mailto:hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com> ] On Behalf Of Dave Hills

Sent: Sunday, May 19, 2013 11:24 AM
To: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

Subject: Re: [hp_agilent_equipment] Re: 3325A ROMS





Joe, Ron,

I've been following this thread for a while and took a look at my own
3325A, which as it turns out has 3 NEC 2332 ROMs. Only U1, U3, and U4
locations are populated.

Looking at the CS signal encoding table on the schematic, it looks to me
as though one could use a single device to replace all four by
connecting the CS1 and CS2 lines to the A12 and A13 pins, respectively,
of a 256K or 512K device, installed in the U1 position. For example,
the Atmel AT27C256R or AT27C542R are widely available under $2 and most
modern programmers can program them.

Do you see any reason why this would not work?

Dave

On 5/19/2013 8:01 AM, J. L. Trantham wrote:

Ron,



For the 3325A, since you are hoping to restore the unit and leave the

chips

in place permanently, I would think that you could get four TMS2532

chips,

since it is listed as a pin compatible EPROM, program the data from my

two

chips into those four chips and give that a shot.



The TMS2532 is available on theBay for under $3 ea (in quantity). I'd

have

to look at the data sheet to see if there are any other 'pin

compatible'

chips for the TMS2532 (or TMS2532A). The TMSxxxx chips are a bit of a
problem to find a programmer that will program them. The BP Micro
programmers will do the job.



If you are not too far away, and I have some TMS2532's, maybe I could

divide

the data and program a set for you. Would love to find out if it

worked.

Joe



From: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

[mailto:hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com> ] On Behalf Of ron_ck722

Sent: Saturday, May 18, 2013 11:38 PM
To: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

Subject: [hp_agilent_equipment] Re: 3325A ROMS





Hi Joe,

While specifically looking for long retention parallel I/O EEPROMs

(most

at

the major distributers are 10 year serial I/O, I2C or SPI Atmels), I

found

two 100 year Greenliant EEPROMs at Mouser:

the $1.88 ea., 64 x 8, GLS29EE512 and

the $2.16 ea., 128k x 8, GLS29EE010,

both in the 32 pin TSOP that isn't too hard to wire to a larger header.
Probably best done carefully after they're programmed.

At that price, I'll buy 3 ea and some 28 pin headers, after I look for

Data

Sheet Gotchas.

Regards,

Ron

--- In hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com> , "ron_ck722"<anfra@>
wrote:

Hi Joe,

Thanks. I've downloaded the file from Didier's website as a .txt.

I've visited the burner website you'd suggested. I should have

received

a

sign-on link email from them.

I'll find a parallel I/O EEPROM and let you know what looks good

before

I

do anything to it, like mounting it on a 24 pin header. If I can't find

a

way to burn it inexpensively myself, I may accept your generous offer

to

mail it and have you burn it.

That procedure I'd mentioned about picking an individual A6 ROM and

using

the CPU to step through each of its Addresses and observe its 8 Outputs
actually works. I was able to use the System Clock and even substitute

an

external generator by cutting the SA CLK jumper. I even clocked it as

slow

as 100 Hertz and watched it take 41 seconds for the bit pattern to

repeat.

I could clock it at 1/2 Hertz and write the bit patterns down

manually.

It

would only take 18 hours to write them down. Otherwise, I could use a

PC

Parallel Printer Port if I could only find a PC with one.

I do appreciate your help.

My Best,

Ron




--- In hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com> , "J. L.

Trantham"<jltran@>

wrote:

I just uploaded the ROM images from my HP 3325A to Didier's site.



Hope this helps someone.



Joe



[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]



------------------------------------

Yahoo! Groups Links

------------------------------------

Yahoo! Groups Links

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

Looks like Yahoo hides our full email addresses. I'm anfra(at)aol(dotcom) and ron(dot)ck722(at)gmail(dotcom). See if that gets hidden

--- In hp_agilent_equipment@..., "ron_ck722" <anfra@> wrote:

Hi Joe,

No problem.

The new CPU is nicely socketed, just in case I ever want to try the old CPU, which may be only slightly boogered from my removing it. I'm so used to modern PCBs that don't take a lot of amateur rework without lifting pads. These old HP boards are pretty durable. As I was removing the CPU and 1 kHz keyboard clock 555 the hard way, with wick and a solder sucker, a couple of pins stayed behind and I had a devil of a time clearing the holes.

In 45 years with IC's I'm one of the few who'd never used a 555.

Sockets would seem at least a temporary requirement with any programmable device like an EPROM.

I also did the capacitor trick. I used to hide T0-3 oscillators inside old 12V vacuum tube car radio metal vibrator cans when vibrators weren't handy or available.

I tried unsuccessfully to download HEXED from one of the ROM hacker websites. I may be more newbie than you. They say a good translator should display HEX and the original ASCII characters together.

What I have now is a safe download, HxD from CNET. It puts everything in a nice table. I wanted to dump it onto an Excel spreadsheet but I'm having problems transferring more than 256 characters at a time. Lotta work. Takes 256 laborious passes.

I didn't tell you - I'm in Lacey WA. There aren't enough electronic distributors here. New habit of mail orders. Did you say you were in Florida?

If we start talking about $$$ we probably shouldn't do it in this forum. I'm trying unsuccessfully to migrate from anfra@ to ron.ck722@ Either is fine to trade details. I haven't tried my Yahoo mail yet.

I don't know how Google and Yahoo keep their trade secrets apart. When I worked a block away, their headquarters were across the street from each other. Couldn't tell them apart. I was reading an IEEE Spectrum article about Yahoo's up and coming first female Engineer, Marissa Meyer. Sent the article to our granddaughter. Next thing I know, Marissa's the CEO.

Had a 79 Camaro and a 79 DeVille at the same time. Big problem - spark plug #1 was inaccessible in both V8's, hidden behind the air conditioner heat exchanger until I figured out from the Packard - if I removed the right front plastic wheel well liner, a 5 minute job, it was absolutely a straight shot with an ordinary socket. No universal joint extender.

Same trick worked putting Amber front turn signal LED replacement bulbs in my 2009 Camry Hybrid.

I'll look at and for the MCMs.

Thanks for all your work and sage advice,

Ron



--- In hp_agilent_equipment@..., "J. L. Trantham" <jltran@> wrote:

Ron,



I think placing a socket is almost required to be a 'member of the group' J.



I have placed sockets for the EPROM and all three Dallas chips in my 3458A.
Sure makes it easier to read and archive the cal constants when it gets back
from calibration and to upgrade the firmware when those are available. I
think of it as 'completing the design HP started but the bean counters got
in the way' J. Reliability is increased with chips soldered in but
serviceability is greatly improved with sockets.



However, if you subscribe to the 'leave no trace' theory, then, I guess, I
understand J.



The only time I've been tempted to disguise a modification is when replacing
the old board mounted aluminum can electrolytics that have 'interconnects'
between some of their multiple terminals to provide ground paths. However,
I've just mounted the replacement radial cap and added wires between
appropriate pads to account for the internal interconnects of the replaced
cap.



I still drive my 'first car', a 1970 Camaro that I bought new in 1970. It's
been through several 'renovations, most recently a 'frame off' restoration
with an entirely new engine and drive train. I couldn't resist the
performance upgrade. Passes everything except the gas station.



Can you give me any details of you ASCII to HEX converter? I'm a 'newbie'
when it comes to computer aided data manipulation.



I think that my U1 has the data from your U1 and U3 and my U2 probably has
the data from your U2 and U4, based on the truth table on the A6 schematic.




I'm not going to be in the shop for about a week but when I get back in
there, I'll see if I can find two TMS2532's, divide the data, and program
the two chips. I think you noted the part numbers of your four chips in an
earlier post and I'll label them accordingly.



Another option is to program two MCM68764's. However, I've not been able to
find them. It would appear that the MCM68766 would be a pin compatible
substitute and I can find them at just under $5 per chip.



Also, where are you? You may have told me but if so, I've forgotten.



Joe







From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...] On Behalf Of ron_ck722
Sent: Tuesday, May 21, 2013 12:18 AM
To: hp_agilent_equipment@...
Subject: [hp_agilent_equipment] Re: 3325A ROMS





Hi Joe,

That would be wonderful if you could program two 2532s and I can try them.
I'd found several NOS new ones on ebay for $4.50 each. I could
use yours, buy 2 or 3 for me or, better yet, send you money on PayPal to buy
2 plus spares, program 2 of them and mail them to me. I may
(sinfully) socket the board if that's allowed (see below).

I've used an ASCII to Hex converter to get the data you sent me in
nice orderly arrays. It's much more understandable, but I'd still need a
burner.

If I'd used an EEPROM, in a moment of insanity, I could always cut the top
off my bad 2332 and hide the new SOIC EEPROM inside. People have done
crazier things.

Since years ago, when I was into antique cars and was body-on restoring a 38
Packard, I became an OEM nut. I always prefer to restore any hardware to
original or near-original condition, even as far as ordering perfect
replacement running board treads, brake hoses or junction-free brake lines.
Try finding 15 feet of continuous steel brake line. Truck repair depots
still have them.

Regards,

Ron

--- In hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com> , "J. L. Trantham"
<jltran@> wrote:

Dave,

When I read the SY2316A's coming from my 3335A, there were three chip

select

lines and CS was 'active low' for all the lines on all the chips. I think
you have 2332 chips, if the manual is correct, and the two CS lines can be
'programmed' in any state you want. Therefore, you would need to make them
extra 'address' lines for the 28 pin chip. I guess the only thing you

would

have to do is to make sure the data shows up in the right 'quadrant' based
on the CS lines, as you said. That would make the 'modification' much more
palatable, with no modification to the A6 board.

I'm still curious why U3 is empty on your A6 board. Have you tried to read
the contents of your ROM's and compare it to the contents of mine?

Also, according to the change sheets, there are several changes at several
locations in the midst of the 1748A serial numbers. I didn't notice
anything when I glanced through it to explain why one ROM would be

missing.

I guess you could explain it if, indeed, U1 was an 8Kx8 such as the
MCM68764. I note yours is Rev. D. Mine is Rev.O. Otherwise, the part
number is the same. Perhaps either you or I misread the Rev. number. I
used a magnifying glass to look at mine.

How easy is it for you to pull yours out and recheck? Mine is mounted in
a rack and getting to the back is a chore but I have done it.

Also, if you look at the pin out of a MCM68764, it looks 'almost' pin
compatible with a 2332. with pin 21 being A12 and pin 20 being the (not)
chip enable (i.e. active low).

Therefore, I suspect your U1 is, in fact, an MCM68764. I had to lift the
label to see the part number on mine.

If true, then dividing the data in the 68764 into two equal parts should
allow someone to 'resurrect' their unit, assuming you could figure out

which

half went where.

Joe



-----Original Message-----
From: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

[mailto:hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com> ] On Behalf Of Dave Hills

Sent: Sunday, May 19, 2013 6:31 PM
To: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

Subject: Re: [hp_agilent_equipment] Re: 3325A ROMS






On 5/19/2013 10:03 AM, J. L. Trantham wrote:

With the appropriate adapter, 28 pin AT27256 to 24 pin socket on the A6
board and some wires coming from the other sockets to the adapter, it

should

work.

I don't' think any wires from the other ROMs are required. It appears
that since the 2332's have "programmable" CS pins, each ROM is mask
programmed with different CS active states. That is, U1 is enabled with
CS=0 and CS2=0, U2 with CS1=1 and CS2=0, and so on according to the
schematic truth table, which is just to the left of the ROMs on the
drawing. My thinking is that connecting U1 Pin 20 and U1 Pin 21 to A12
and A13, respectively on a 27C256 EPROM, (or a 27C128, for that matter,)
will sequentially address 4K blocks without any connections to U2, U3,
or U4.

However, my preference is to try to maintain 'originality' and if there

is

a

pin compatible EPROM, I would tend to do that first.



I'm interested in why yours has only 3 chips. What options do you have
installed? Mine has 001 (high stability frequency reference) and 002

(high

voltage output). I wonder if that makes a difference. I did not spend

any

time with the manual looking at the issue of what chips were installed

with

what options. I don't think 001 would require a different firmware but I
suspect 002 might. However, I didn't see any mention of that in the

parts

list.

First, a correction, U3 is empty, not U2 as I originally stated. S/N is
1748A, Opt. 1, Opt.2, A6 assembly is P/N 3325-66506, Rev.C.
Parts are date code 1984.

U1 has a label:
Rev. D 011
03325-19401

It is a ceramic part and appears to be an EPROM, not a ROM as U2 and
U4. My guess would be it is an 8Kx8, (64K,) which addresses both U1 and
U3's 4K memory blocks. This works out perfectly for U1 being a MCM68764
or compatible EPROM.

The PC business was exploding in 1984, and memory shortages were
common. They may have just used whatever they could acquire at the
time, rather than being related to specific hardware options. I know
that's what we did back then.

Also, what is the serial number of your 3325A and the part number of

your

A6

board? I notice in the manual, several changes happened in the midst of
serial numbers having a 1748A prefix.



Joe



From: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

[mailto:hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com> ] On Behalf Of Dave Hills

Sent: Sunday, May 19, 2013 11:24 AM
To: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

Subject: Re: [hp_agilent_equipment] Re: 3325A ROMS





Joe, Ron,

I've been following this thread for a while and took a look at my own
3325A, which as it turns out has 3 NEC 2332 ROMs. Only U1, U3, and U4
locations are populated.

Looking at the CS signal encoding table on the schematic, it looks to me
as though one could use a single device to replace all four by
connecting the CS1 and CS2 lines to the A12 and A13 pins, respectively,
of a 256K or 512K device, installed in the U1 position. For example,
the Atmel AT27C256R or AT27C542R are widely available under $2 and most
modern programmers can program them.

Do you see any reason why this would not work?

Dave

On 5/19/2013 8:01 AM, J. L. Trantham wrote:

Ron,



For the 3325A, since you are hoping to restore the unit and leave the

chips

in place permanently, I would think that you could get four TMS2532

chips,

since it is listed as a pin compatible EPROM, program the data from my

two

chips into those four chips and give that a shot.



The TMS2532 is available on theBay for under $3 ea (in quantity). I'd

have

to look at the data sheet to see if there are any other 'pin

compatible'

chips for the TMS2532 (or TMS2532A). The TMSxxxx chips are a bit of a
problem to find a programmer that will program them. The BP Micro
programmers will do the job.



If you are not too far away, and I have some TMS2532's, maybe I could

divide

the data and program a set for you. Would love to find out if it

worked.

Joe



From: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

[mailto:hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com> ] On Behalf Of ron_ck722

Sent: Saturday, May 18, 2013 11:38 PM
To: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

Subject: [hp_agilent_equipment] Re: 3325A ROMS





Hi Joe,

While specifically looking for long retention parallel I/O EEPROMs

(most

at

the major distributers are 10 year serial I/O, I2C or SPI Atmels), I

found

two 100 year Greenliant EEPROMs at Mouser:

the $1.88 ea., 64 x 8, GLS29EE512 and

the $2.16 ea., 128k x 8, GLS29EE010,

both in the 32 pin TSOP that isn't too hard to wire to a larger header.
Probably best done carefully after they're programmed.

At that price, I'll buy 3 ea and some 28 pin headers, after I look for

Data

Sheet Gotchas.

Regards,

Ron

--- In hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com> , "ron_ck722"<anfra@>
wrote:

Hi Joe,

Thanks. I've downloaded the file from Didier's website as a .txt.

I've visited the burner website you'd suggested. I should have

received

a

sign-on link email from them.

I'll find a parallel I/O EEPROM and let you know what looks good

before

I

do anything to it, like mounting it on a 24 pin header. If I can't find

a

way to burn it inexpensively myself, I may accept your generous offer

to

mail it and have you burn it.

That procedure I'd mentioned about picking an individual A6 ROM and

using

the CPU to step through each of its Addresses and observe its 8 Outputs
actually works. I was able to use the System Clock and even substitute

an

external generator by cutting the SA CLK jumper. I even clocked it as

slow

as 100 Hertz and watched it take 41 seconds for the bit pattern to

repeat.

I could clock it at 1/2 Hertz and write the bit patterns down

manually.

It

would only take 18 hours to write them down. Otherwise, I could use a

PC

Parallel Printer Port if I could only find a PC with one.

I do appreciate your help.

My Best,

Ron




--- In hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com> , "J. L.

Trantham"<jltran@>

wrote:

I just uploaded the ROM images from my HP 3325A to Didier's site.



Hope this helps someone.



Joe



[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]



------------------------------------

Yahoo! Groups Links

[Non-text portions of this message have been removed]



------------------------------------

Yahoo! Groups Links

[Non-text portions of this message have been removed]

On 5/21/2013 7:08 PM, ron_ck722 wrote:

Hi Joe,

<snip>

Had a 79 Camaro and a 79 DeVille at the same time. Big problem - spark
plug #1 was inaccessible in both V8's, hidden behind the air conditioner
heat exchanger until I figured out from the Packard - if I removed the
right front plastic wheel well liner, a 5 minute job, it was absolutely
a straight shot with an ordinary socket. No universal joint extender.

Hello, Ron and the group--

Supposedly, the only way to reach one of the spark plugs in certain
1970s models of the Jaguar involved having the mechanic's wrist broken
and reset at an odd angle so that the mechanic could reach the spark
plug. This led to long delays in obtaining a tune-up while the wrist
healed, and a high turnover in mechanics<g>.

An analogous test instrument would be HP's 6827A bipolar power
supply/amplifier, which requires displacement of the power transformer
(which has too-short leads and must be balanced at an awkward angle to
access the the main PC board). That instrument has a few additional
flaws that make it my all-time least-favorite Hp product.

73--

Brad AA1IP

Ron,



I'd be happy to burn chips for you. Where are you?



I am in NW FL, USA.



Joe



From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...] On Behalf Of ron_ck722
Sent: Saturday, May 18, 2013 8:49 PM
To: hp_agilent_equipment@...
Subject: [hp_agilent_equipment] Re: 3325A ROMS





Hi Joe,

Thanks. I've downloaded the file from Didier's website as a .txt.

I've visited the burner website you'd suggested. I should have received a
sign-on link email from them.

I'll find a parallel I/O EEPROM and let you know what looks good before I do
anything to it, like mounting it on a 24 pin header. If I can't find a way
to burn it inexpensively myself, I may accept your generous offer to mail it
and have you burn it.

That procedure I'd mentioned about picking an individual A6 ROM and using
the CPU to step through each of its Addresses and observe its 8 Outputs
actually works. I was able to use the System Clock and even substitute an
external generator by cutting the SA CLK jumper. I even clocked it as slow
as 100 Hertz and watched it take 41 seconds for the bit pattern to repeat.

I could clock it at 1/2 Hertz and write the bit patterns down manually. It
would only take 18 hours to write them down. Otherwise, I could use a PC
Parallel Printer Port if I could only find a PC with one.

I do appreciate your help.

My Best,

Ron

--- In hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com> , "J. L. Trantham"
<jltran@> wrote:

I just uploaded the ROM images from my HP 3325A to Didier's site.



Hope this helps someone.



Joe

Hi John,

My full address is:

Ron Bax
2401 Sleater Kinney Rd SE
Lacey, WA 98503

(cell) 650-380-1569
(home) 360-438-5641

While I haven't yet used it, you can always email me with any details you'd rather not Post:

ron_ck722@...

That email address should show on this Post, maybe not.

Ron




--- In hp_agilent_equipment@..., "J. L. Trantham" <jltran@> wrote:

Ron,



I'd be happy to burn chips for you. Where are you?



I am in NW FL, USA.



Joe



From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...] On Behalf Of ron_ck722
Sent: Saturday, May 18, 2013 8:49 PM
To: hp_agilent_equipment@...
Subject: [hp_agilent_equipment] Re: 3325A ROMS





Hi Joe,

Thanks. I've downloaded the file from Didier's website as a .txt.

I've visited the burner website you'd suggested. I should have received a
sign-on link email from them.

I'll find a parallel I/O EEPROM and let you know what looks good before I do
anything to it, like mounting it on a 24 pin header. If I can't find a way
to burn it inexpensively myself, I may accept your generous offer to mail it
and have you burn it.

That procedure I'd mentioned about picking an individual A6 ROM and using
the CPU to step through each of its Addresses and observe its 8 Outputs
actually works. I was able to use the System Clock and even substitute an
external generator by cutting the SA CLK jumper. I even clocked it as slow
as 100 Hertz and watched it take 41 seconds for the bit pattern to repeat.

I could clock it at 1/2 Hertz and write the bit patterns down manually. It
would only take 18 hours to write them down. Otherwise, I could use a PC
Parallel Printer Port if I could only find a PC with one.

I do appreciate your help.

My Best,

Ron

--- In hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com> , "J. L. Trantham"
<jltran@> wrote:

I just uploaded the ROM images from my HP 3325A to Didier's site.



Hope this helps someone.



Joe

[Non-text portions of this message have been removed]

Ron,



I have sent a couple of PM's with no response.



I have divided up my two 64K EPROM's into four 32K EPROM's. If still
interested, I can send them.



Joe



From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...] On Behalf Of ron_ck722
Sent: Wednesday, May 22, 2013 4:51 PM
To: hp_agilent_equipment@...
Subject: [hp_agilent_equipment] Re: 3325A ROMS





Hi John,

My full address is:

Ron Bax
2401 Sleater Kinney Rd SE
Lacey, WA 98503

(cell) 650-380-1569
(home) 360-438-5641

While I haven't yet used it, you can always email me with any details you'd
rather not Post:

ron_ck722@... <mailto:ron_ck722%40yahoo.com>

That email address should show on this Post, maybe not.

Ron

--- In hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com> , "J. L. Trantham"
<jltran@> wrote:

Ron,



I'd be happy to burn chips for you. Where are you?



I am in NW FL, USA.



Joe



From: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

[mailto:hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com> ] On Behalf Of ron_ck722

Sent: Saturday, May 18, 2013 8:49 PM
To: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

Subject: [hp_agilent_equipment] Re: 3325A ROMS





Hi Joe,

Thanks. I've downloaded the file from Didier's website as a .txt.

I've visited the burner website you'd suggested. I should have received a
sign-on link email from them.

I'll find a parallel I/O EEPROM and let you know what looks good before I

do

anything to it, like mounting it on a 24 pin header. If I can't find a way
to burn it inexpensively myself, I may accept your generous offer to mail

it

and have you burn it.

That procedure I'd mentioned about picking an individual A6 ROM and using
the CPU to step through each of its Addresses and observe its 8 Outputs
actually works. I was able to use the System Clock and even substitute an
external generator by cutting the SA CLK jumper. I even clocked it as slow
as 100 Hertz and watched it take 41 seconds for the bit pattern to repeat.

I could clock it at 1/2 Hertz and write the bit patterns down manually. It
would only take 18 hours to write them down. Otherwise, I could use a PC
Parallel Printer Port if I could only find a PC with one.

I do appreciate your help.

My Best,

Ron

--- In hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com> , "J. L. Trantham"
<jltran@> wrote:

I just uploaded the ROM images from my HP 3325A to Didier's site.



Hope this helps someone.



Joe



[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

Ron,



I have sent a couple of PM's with no response.



I have divided up my two 64K EPROM's into four 32K EPROM's. If still
interested, I can send them.



Joe



From: hp_agilent_equipment@...

[mailto:hp_agilent_equipment@...

Sent: Wednesday, May 22, 2013 4:51 PM
To: hp_agilent_equipment@...

Subject: [hp_agilent_equipment] Re: 3325A ROMS





Hi John,

My full address is:

Ron Bax
2401 Sleater Kinney Rd SE
Lacey, WA 98503

(cell) 650-380-1569
(home) 360-438-5641

While I haven't yet used it, you can always email me with any details

rather not Post:

ron_ck722@... <mailto:ron_ck722%40yahoo.com>;

That email address should show on this Post, maybe not.

Ron

--- In hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>; , "J. L. Trantham"
<jltran@> wrote:

Ron,



I'd be happy to burn chips for you. Where are you?



I am in NW FL, USA.



Joe



From: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>;

[mailto:hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>; ] On Behalf Of ron_ck722

Sent: Saturday, May 18, 2013 8:49 PM
To: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>;

Subject: [hp_agilent_equipment] Re: 3325A ROMS





Hi Joe,

Thanks. I've downloaded the file from Didier's website as a .txt.

I've visited the burner website you'd suggested. I should have received

sign-on link email from them.

I'll find a parallel I/O EEPROM and let you know what looks good before

do

anything to it, like mounting it on a 24 pin header. If I can't find a

to burn it inexpensively myself, I may accept your generous offer to

it

and have you burn it.

That procedure I'd mentioned about picking an individual A6 ROM and

the CPU to step through each of its Addresses and observe its 8 Outputs
actually works. I was able to use the System Clock and even substitute

external generator by cutting the SA CLK jumper. I even clocked it as

as 100 Hertz and watched it take 41 seconds for the bit pattern to

I could clock it at 1/2 Hertz and write the bit patterns down manually.

would only take 18 hours to write them down. Otherwise, I could use a PC
Parallel Printer Port if I could only find a PC with one.

I do appreciate your help.

My Best,

Ron

--- In hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>;

<mailto:hp_agilent_equipment%40yahoogroups.com>; , "J. L. Trantham"
<jltran@> wrote:

I just uploaded the ROM images from my HP 3325A to Didier's site.



Hope this helps someone.



Joe



[Non-text portions of this message have been removed]

Hello Ron & Joe,

Ron, I am  Jon that has been in discussion about the 3325A with you on the phone for the last couple of mornings.  I finally got to map out the select configuration with those four 2332 roms on your 3325A, I felt compelled to give you my input on what I have found.  If you will notice how the CS1 is wired to both U1 and U3 in parallel as well as through inversion logic(Nand Gate U46) U2 and U4.  HP employed the 4 parallel 2332 rom selection scheme (programmed active high / active low chip selection) without using complex address decoding as the Synertek data sheets imply. Through custom mask programming of CS1  & CS2 (selected High or Low) this allows you to select 4 parts with a minimal amount of logic. I'm thinking that if you simply burn or copy code into a U3 part without considering the possible inverted pin 20 chip selection (possibly programmed in the mask at time of production) it could be come selected when it shouldn't be.  You may have
to use some inverters where needed on pins 20(CS1) and pin 21(CS2) according to your part selection requirements.  Just a thought & Best of luck to you!


Regards,

JLMoon 




________________________________
From: "anfra@..." <anfra@...>
To: hp_agilent_equipment@...
Sent: Wednesday, June 5, 2013 12:00 AM
Subject: Re: [hp_agilent_equipment] Re: 3325A ROMS



 

Hi Joe,

It was great talking to you. I did already have a copy of the Synertek catalog.
Interesting that they were just down the road from my employer, National
Semiconductor, now part of Texas Instruments.

When Synertek closed down in 1985(?), their main building was declared a
Superfund site.

I'll verify the pinout and functionality as soon as I get them. If they work,
they'll be a great benefit to a number of users, since you'll have a 2
chip solution, a 4 chip solution and a potential 1 chip solution.

I'll keep in touch.

Thanks again.

Ron

-----Original Message-----
From: J. L. Trantham <jltran@...>
To: hp_agilent_equipment <hp_agilent_equipment@...>
Sent: Tue, Jun 4, 2013 8:20 pm
Subject: RE: [hp_agilent_equipment] Re: 3325A ROMS

Ron,

When you get the TMS2532's, it would be good to compare the pin out's with
that of the SY2332's.

Have you found the Synertek data book yet?

If not, it can be found here:

http://archive.6502.org/datasheets/synertek_1981_1982_data_catalog.pdf

It has the data sheet on the ROM's for the 3325A as well as the 3335A.

The Synertek 2332 data sheet states that the 2332 is a pin for pin
replacement of the 2532. However, it would be good to make sure before
plugging them in.

Also, if you can verify that the four 2532 chips work in your 3325A, I can
post them on Didier's site as a solution for others needing EPROM's for
their 'four chip' A6 boards. They are just the 'two chip' version divided
into four chips.

Joe

From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...] On Behalf Of ron_ck722
Sent: Monday, June 03, 2013 12:09 AM
To: hp_agilent_equipment@...
Subject: [hp_agilent_equipment] Re: 3325A ROMS

Hi Joe,

I'm absolutely interested and excited. If you've called my cell, I didn't
turn it on this morning. Shame on me.

I'm also getting lots of Agilent Equipment group emails - they (and yours)
have gone into my spam folder.

I'd like to talk to you whenever you can. 650-380-1569. I'm on Pacific Time.

Pardon my ignorance - I've not done this before - how do you tell if the
data boundaries are correct, i.e. when my system addresses the first 8 bit
word of ROM2 that it isn't the last 8 bit word of ROM1?

Is it sufficient to know each ROM has 4096 eight bit words?

Once we've talked, I'll start by carefully removing and socketing ROM3.

It'll be good to see if the Signature Analyzer pinned it to ROM3.

Thanks again,

Ron

I haven't turned the 3325A on for almost 2 weeks. I started visiting some of
my other Yahoo techie groups. The Agilent Equipment Group is inhabited by
real humans. Some of the others are just too closed-minded for me.

--- In hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>; , "J. L. Trantham"
<jltran@> wrote:

Ron,



I have sent a couple of PM's with no response.



I have divided up my two 64K EPROM's into four 32K EPROM's. If still
interested, I can send them.



Joe



From: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>;

[mailto:hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>; ] On Behalf Of ron_ck722

Sent: Wednesday, May 22, 2013 4:51 PM
To: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>;

Subject: [hp_agilent_equipment] Re: 3325A ROMS





Hi John,

My full address is:

Ron Bax
2401 Sleater Kinney Rd SE
Lacey, WA 98503

(cell) 650-380-1569
(home) 360-438-5641

While I haven't yet used it, you can always email me with any details

you'd

rather not Post:

ron_ck722@ <mailto:ron_ck722%40yahoo.com>;

That email address should show on this Post, maybe not.

Ron

--- In hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>;

<mailto:hp_agilent_equipment%40yahoogroups.com>; , "J. L. Trantham"
<jltran@> wrote:

Ron,



I'd be happy to burn chips for you. Where are you?



I am in NW FL, USA.



Joe



From: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>;

<mailto:hp_agilent_equipment%40yahoogroups.com>;

[mailto:hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>;

<mailto:hp_agilent_equipment%40yahoogroups.com>; ] On Behalf Of ron_ck722

Sent: Saturday, May 18, 2013 8:49 PM
To: hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>;

<mailto:hp_agilent_equipment%40yahoogroups.com>;

Subject: [hp_agilent_equipment] Re: 3325A ROMS





Hi Joe,

Thanks. I've downloaded the file from Didier's website as a .txt.

I've visited the burner website you'd suggested. I should have received

a

sign-on link email from them.

I'll find a parallel I/O EEPROM and let you know what looks good before

I

do

anything to it, like mounting it on a 24 pin header. If I can't find a

way

to burn it inexpensively myself, I may accept your generous offer to

mail

it

and have you burn it.

That procedure I'd mentioned about picking an individual A6 ROM and

using

the CPU to step through each of its Addresses and observe its 8 Outputs
actually works. I was able to use the System Clock and even substitute

an

external generator by cutting the SA CLK jumper. I even clocked it as

slow

as 100 Hertz and watched it take 41 seconds for the bit pattern to

repeat.

I could clock it at 1/2 Hertz and write the bit patterns down manually.

It

would only take 18 hours to write them down. Otherwise, I could use a PC
Parallel Printer Port if I could only find a PC with one.

I do appreciate your help.

My Best,

Ron

--- In hp_agilent_equipment@...

<mailto:hp_agilent_equipment%40yahoogroups.com>;

<mailto:hp_agilent_equipment%40yahoogroups.com>;

<mailto:hp_agilent_equipment%40yahoogroups.com>; , "J. L. Trantham"
<jltran@> wrote:

I just uploaded the ROM images from my HP 3325A to Didier's site.



Hope this helps someone.



Joe



[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]




[Non-text portions of this message have been removed]

Jon and Ron,



That will be very important information for the folks that will want to replace their Synertek chips with the TI TMS2532 chips. The TMS2532A is the same chip but with a different programming voltage.



Ron, once you solve that puzzle, we need to make sure that we create a ‘ReadMe’ that properly explains the conversion from the SY2332 to the TMS2532.



I was looking at the schematic of the A6 board and it looks like pretty much any combination you would want would be available on the board, just by moving some jumpers. Ron, you’ll be in the best position to answer that question. If so, some specific instructions will be all that is needed. Otherwise, an ‘adapter board’ would be needed to make that happen.



I read some SY2316A’s from a 3335A that were ‘chip select LOW active’. Jon, your description of the variability of the ‘chip select’ line as ‘active low’ or ‘active high’ is correct when it comes to the MASKED ROM’s. They could be had in any configuration you wanted if I understand the data book correctly.



Look forward to hearing if the EPROM’s work or not.



Joe



From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] On Behalf Of J
Sent: Wednesday, June 05, 2013 8:56 AM
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] Re: 3325A ROMS





Hello Ron & Joe,

Ron, I am Jon that has been in discussion about the 3325A with you on the phone for the last couple of mornings. I finally got to map out the select configuration with those four 2332 roms on your 3325A, I felt compelled to give you my input on what I have found. If you will notice how the CS1 is wired to both U1 and U3 in parallel as well as through inversion logic(Nand Gate U46) U2 and U4. HP employed the 4 parallel 2332 rom selection scheme (programmed active high / active low chip selection) without using complex address decoding as the Synertek data sheets imply. Through custom mask programming of CS1 & CS2 (selected High or Low) this allows you to select 4 parts with a minimal amount of logic. I'm thinking that if you simply burn or copy code into a U3 part without considering the possible inverted pin 20 chip selection (possibly programmed in the mask at time of production) it could be come selected when it shouldn't be. You may have
to use some inverters where needed on pins 20(CS1) and pin 21(CS2) according to your part selection requirements. Just a thought & Best of luck to you!

Regards,

JLMoon

________________________________
From: "anfra@... <mailto:anfra%40aol.com> " <anfra@... <mailto:anfra%40aol.com> >
To: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>
Sent: Wednesday, June 5, 2013 12:00 AM
Subject: Re: [hp_agilent_equipment] Re: 3325A ROMS




Hi Joe,

It was great talking to you. I did already have a copy of the Synertek catalog.
Interesting that they were just down the road from my employer, National
Semiconductor, now part of Texas Instruments.

When Synertek closed down in 1985(?), their main building was declared a
Superfund site.

I'll verify the pinout and functionality as soon as I get them. If they work,
they'll be a great benefit to a number of users, since you'll have a 2
chip solution, a 4 chip solution and a potential 1 chip solution.

I'll keep in touch.

Thanks again.

Ron

-----Original Message-----
From: J. L. Trantham <jltran@... <mailto:jltran%40att.net> >
To: hp_agilent_equipment <hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com> >
Sent: Tue, Jun 4, 2013 8:20 pm
Subject: RE: [hp_agilent_equipment] Re: 3325A ROMS

Ron,

When you get the TMS2532's, it would be good to compare the pin out's with
that of the SY2332's.

Have you found the Synertek data book yet?

If not, it can be found here:

http://archive.6502.org/datasheets/synertek_1981_1982_data_catalog.pdf

It has the data sheet on the ROM's for the 3325A as well as the 3335A.

The Synertek 2332 data sheet states that the 2332 is a pin for pin
replacement of the 2532. However, it would be good to make sure before
plugging them in.

Also, if you can verify that the four 2532 chips work in your 3325A, I can
post them on Didier's site as a solution for others needing EPROM's for
their 'four chip' A6 boards. They are just the 'two chip' version divided
into four chips.

Joe

From: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>
[mailto:hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com> ] On Behalf Of ron_ck722
Sent: Monday, June 03, 2013 12:09 AM
To: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>
Subject: [hp_agilent_equipment] Re: 3325A ROMS

Hi Joe,

I'm absolutely interested and excited. If you've called my cell, I didn't
turn it on this morning. Shame on me.

I'm also getting lots of Agilent Equipment group emails - they (and yours)
have gone into my spam folder.

I'd like to talk to you whenever you can. 650-380-1569. I'm on Pacific Time.

Pardon my ignorance - I've not done this before - how do you tell if the
data boundaries are correct, i.e. when my system addresses the first 8 bit
word of ROM2 that it isn't the last 8 bit word of ROM1?

Is it sufficient to know each ROM has 4096 eight bit words?

Once we've talked, I'll start by carefully removing and socketing ROM3.

It'll be good to see if the Signature Analyzer pinned it to ROM3.

Thanks again,

Ron

I haven't turned the 3325A on for almost 2 weeks. I started visiting some of
my other Yahoo techie groups. The Agilent Equipment Group is inhabited by
real humans. Some of the others are just too closed-minded for me.

--- In hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>
<mailto:hp_agilent_equipment%40yahoogroups.com>; , "J. L. Trantham"
<jltran@> wrote:

Ron,



I have sent a couple of PM's with no response.



I have divided up my two 64K EPROM's into four 32K EPROM's. If still
interested, I can send them.



Joe



From: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>;

[mailto:hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>; ] On Behalf Of ron_ck722

Sent: Wednesday, May 22, 2013 4:51 PM
To: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>;

Subject: [hp_agilent_equipment] Re: 3325A ROMS





Hi John,

My full address is:

Ron Bax
2401 Sleater Kinney Rd SE
Lacey, WA 98503

(cell) 650-380-1569
(home) 360-438-5641

While I haven't yet used it, you can always email me with any details

you'd

rather not Post:

ron_ck722@ <mailto:ron_ck722%40yahoo.com>;

That email address should show on this Post, maybe not.

Ron

--- In hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>;

<mailto:hp_agilent_equipment%40yahoogroups.com>; , "J. L. Trantham"
<jltran@> wrote:

Ron,



I'd be happy to burn chips for you. Where are you?



I am in NW FL, USA.



Joe



From: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>;

<mailto:hp_agilent_equipment%40yahoogroups.com>;

[mailto:hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>;

<mailto:hp_agilent_equipment%40yahoogroups.com>; ] On Behalf Of ron_ck722

Sent: Saturday, May 18, 2013 8:49 PM
To: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>;

<mailto:hp_agilent_equipment%40yahoogroups.com>;

Subject: [hp_agilent_equipment] Re: 3325A ROMS





Hi Joe,

Thanks. I've downloaded the file from Didier's website as a .txt.

I've visited the burner website you'd suggested. I should have received

a

sign-on link email from them.

I'll find a parallel I/O EEPROM and let you know what looks good before

I

do

anything to it, like mounting it on a 24 pin header. If I can't find a

way

to burn it inexpensively myself, I may accept your generous offer to

mail

it

and have you burn it.

That procedure I'd mentioned about picking an individual A6 ROM and

using

the CPU to step through each of its Addresses and observe its 8 Outputs
actually works. I was able to use the System Clock and even substitute

an

external generator by cutting the SA CLK jumper. I even clocked it as

slow

as 100 Hertz and watched it take 41 seconds for the bit pattern to

repeat.

I could clock it at 1/2 Hertz and write the bit patterns down manually.

It

would only take 18 hours to write them down. Otherwise, I could use a PC
Parallel Printer Port if I could only find a PC with one.

I do appreciate your help.

My Best,

Ron

--- In hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>

<mailto:hp_agilent_equipment%40yahoogroups.com>;

<mailto:hp_agilent_equipment%40yahoogroups.com>;

<mailto:hp_agilent_equipment%40yahoogroups.com>; , "J. L. Trantham"
<jltran@> wrote:

I just uploaded the ROM images from my HP 3325A to Didier's site.



Hope this helps someone.



Joe



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