1. TekScopes@groups.io
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Re: TV on a 7000 Scope - impossible on any other lab scope

Michael A. Terrell
 

A triggered scope already blanks the retrace, so nothing else is needed. Feed the sweep into the X & Y channels, and the video to the Z input. Adjust the gain and intensity to suit.


Don Black wrote:


Perhaps they used the sweep gate signal fed into the Z input, maybe with a bit of external circuitry (especially if intensity modulation was also needed).

Don Black.

On 06-Jun-13 6:05 AM, cheater00 . wrote:

Interesting. Still, as I suspected, it's not possible with what's on
the "outside". I wonder what exactly they did to make blanking
possible.

Cheers,
D.
Re: TV on a 7000 Scope - impossible on any other lab scope

cheater cheater
 

Hi Don,
how does one obtain the sweep gate?

Cheers
D.


On Thu, Jun 6, 2013 at 1:41 PM, Don Black <donald_black@...> wrote:


Perhaps they used the sweep gate signal fed into the Z input, maybe with a bit of external circuitry (especially if intensity modulation was also needed).

Don Black.


On 06-Jun-13 6:05 AM, cheater00 . wrote:
 

Interesting. Still, as I suspected, it's not possible with what's on
the "outside". I wonder what exactly they did to make blanking
possible.

Cheers,
D.

On Wed, Jun 5, 2013 at 9:42 PM, John Rehwinkel <jrehwin@...> wrote:
>> Hi John, do you have the app note? I would be interested since I use
>> raster mode in measurements. I have been wondering whether there's a
>> way to do this at all. I guess maybe with a dual triggering timebase
>> but not sure how.
>
> Okay, my memory wasn't quite accurate, there isn't a specific app note, but apparently Field Offices could obtain information on retrace blanking when raster scanning using a sweep plug-in in a vertical compartment.
>
> From the 7603 manual (under "Raster Display"):
>
> For this type of display, the trace is deflected both vertically and horizontally by sawtooth signals. This is accomplished in the 7603 by installing a 7B-series time-base unit in one of the vertical plug-in ocmpartments.
>
> Another method of displaying information on the raster is to use the EXT Z AXIS input to provide intensity modulation of the display. This type of raster display could be used to provide a television-type display. Complete information on operation using the Z-axis feature is given under Intensity Modulation.
>
> To provide a stable raster display, both time-base units must be correctly triggered. Internal triggering is not provided for the time-base units when they are in the vertical compartments; external triggering must be used. Also, blanking is not provided from the time-base units when they are installed in a vertical compartment. To blank out the retrace portion from the time-base unit in the vertical compartment, special connections must be made from this time-base unit to the blanking network of the 7603.
>
> If this mode of operation is desirable, contact your local TEKTRONIX Field Office or representative for specific information on obtaining blanking with the specific time-base unit being used in the vertical compartment.
>
> - John
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
Re: 7D15 with very nasty short on -15V ... almost made me cry the first time I plu

Don Black <donald_black@...>
 

I feel the pain, good advice on defocussing. Sadly it seems the horse is over the hill and far away in this case.

Don Black.

On 06-Jun-13 12:52 PM, David wrote:
 

I would look for some other problem. I have yet to find a shorted
trace in one of these.

Defocusing the beam when testing unknown plug-ins can save the CRT
from damage.
Re: TV on a 7000 Scope - impossible on any other lab scope

Don Black <donald_black@...>
 

Perhaps they used the sweep gate signal fed into the Z input, maybe with a bit of external circuitry (especially if intensity modulation was also needed).

Don Black.

On 06-Jun-13 6:05 AM, cheater00 . wrote:
 

Interesting. Still, as I suspected, it's not possible with what's on
the "outside". I wonder what exactly they did to make blanking
possible.

Cheers,
D.

On Wed, Jun 5, 2013 at 9:42 PM, John Rehwinkel <jrehwin@...> wrote:
>> Hi John, do you have the app note? I would be interested since I use
>> raster mode in measurements. I have been wondering whether there's a
>> way to do this at all. I guess maybe with a dual triggering timebase
>> but not sure how.
>
> Okay, my memory wasn't quite accurate, there isn't a specific app note, but apparently Field Offices could obtain information on retrace blanking when raster scanning using a sweep plug-in in a vertical compartment.
>
> From the 7603 manual (under "Raster Display"):
>
> For this type of display, the trace is deflected both vertically and horizontally by sawtooth signals. This is accomplished in the 7603 by installing a 7B-series time-base unit in one of the vertical plug-in ocmpartments.
>
> Another method of displaying information on the raster is to use the EXT Z AXIS input to provide intensity modulation of the display. This type of raster display could be used to provide a television-type display. Complete information on operation using the Z-axis feature is given under Intensity Modulation.
>
> To provide a stable raster display, both time-base units must be correctly triggered. Internal triggering is not provided for the time-base units when they are in the vertical compartments; external triggering must be used. Also, blanking is not provided from the time-base units when they are installed in a vertical compartment. To blank out the retrace portion from the time-base unit in the vertical compartment, special connections must be made from this time-base unit to the blanking network of the 7603.
>
> If this mode of operation is desirable, contact your local TEKTRONIX Field Office or representative for specific information on obtaining blanking with the specific time-base unit being used in the vertical compartment.
>
> - John
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
Re: Impossible Photo except on a 7000 scope

Don Black <donald_black@...>
 

I tried eBay when it was first mentioned and got the 7D20s but I think there was also a manual for a 7J20, I think for $70.00. Now there are no hits, maybe they all sold?
Don Black.

On 06-Jun-13 2:25 AM, cleyson@... wrote:
 

It's because the search engine tries to find a close match,
like 7L12 will throw up 7L5 or 7S12 for example. BTW If you
ever find a 7J20 it's no good without the J20 spectrometer.

Chris

--- In TekScopes@..., Mark Wendt wrote:
>
> On 06/05/2013 11:12 AM, Richard Solomon wrote:
> >
> >
> > I did a search on 7J20 and came up empty. Are they listed under something
> > else ??
> >
> > 73, Dick, W1KSZ
>
> Ebay must be responding weirdly to my searches. I put in tektronix 7j20
> and I got those three 7d20's back.
>
> Mark
>
Re: OT variac brushes ( operation )

Don Black <donald_black@...>
 

Carbon brushes aren't what they at first seem. They have different resistivity in different directions so they conduct well from the face to the rear connection but poorly across the face to minimize the current flowing from turn to turn (or segment to segment in a commutator). I'm sure others who work with them will be able to add more to this. Also, I believe the brush material differs depending on the voltage and current they operate at.

Don Black.

On 05-Jun-13 11:33 PM, Bert Haskins wrote:
 

While doing my spring cleaning I ran across a GI model W variac that is
missing it's
brush and brush holder assembly.
It would not be much of a trick to fab up a new assembly but that raises
a question:
What happens when the brush connects more than one turn on the core?
This would seem to be a fault condition ( as in a shorted turn ) but it
looks like that is
just what happens on my other variacs.
Does it matter?
Re: OT variac brushes and cigarettes

Mark Wendt <mark.wendt@...>
 

On 06/05/2013 06:11 PM, jerry massengale wrote:


Hi,

Seeing all this talk about brushes reminds me that when we had to service and clean old motors and generators in aircraft radio gear meant getting carbon dust on your hands and that your cigarettes taste bitter. does anyone remember that?

Jerry Massengale
Yup. The good old days. Peeling potting compound off your fingers after building cannon plugs, freezing rice bugs and grass hoppers in liquid nitrogen, not seeing a puddle of hydraulic fluid under the belly of the F-4 and notifying the crew chief that the aircraft's hydraulic reservoir was probably empty, poking yourself with safety wire, doing the final "drop" test on the 23 channel aux UHF receiver (all tubes), being stuck all day in the Faraday cage testing emergency radios... ;-)

Them were the days.

Mark
Re: Impossible Photo except on a 7000 scope

Mark Wendt <mark.wendt@...>
 

Dennis,

It was Ebay feeding false info to my search. They were actually 7D20's, not 7J20's.

Mark

On 06/05/2013 03:03 PM, Dennis Tillman wrote:
Hi Mark,

That would be very unusual. They aren't that common and one was auctioned
off a few months ago with a 7000 DPO The DPO has the PDP-11 minicomputer in
the middle of a 7704A.

I searched Ebay for any 7J20s and didn't find even one.

What are the auction numbers?

dennis

-----Original Message-----
From: Mark Wendt, Sent: Wednesday, June 05, 2013 2:33 AM

Dennis,

Your timing, as usual, is impeccable. There are currently three 7J20's up
for auction on Ebay right not. ;-)

Mark
Re: 7D15 with very nasty short on -15V ... almost made me cry the first time I plu

tekloverbob
 

Yes... I had overlooked the trigger input amplifiers section. I wish I had a better manual than the download I am looking at.  I will do some more troubleshooting tomorrow now that I have a place to look. I have already removed the A8 board. I will let you know what I find tomorrow. Thanks very much, Bob


--- In TekScopes@..., David wrote:
>
> The interface board where the -15 volt supply comes in includes the
> trigger input amplifiers on schematic 1 which make extensive use of
> the -15 volt supply and the gating and control logic on schematic 2
> which only uses the -15 volt supply for resistive level shifting and
> biasing.
>
> -15 volts is also supplied to the switching regulator on board A8
> which produces -5 volts for the ECL logic. You can pull board A8 off
> of the interface board without too much trouble after removing two
> screws.
>
> I would also remove U43 and U143 on schematic 2 to see if they are
> shorting the -15 supply.
>
> On Thu, 06 Jun 2013 04:44:52 -0000, "tekloverbob"
> bob654321@... wrote:
>
> >The short has been isolated to the "interface A" board. I can only find a couple of places where the -15 is used on this board and no component that could cause a short except one bypass cap that is ok. the feeds to the other boards and the other boards are ok. Doesn't leave much but the PC board? Bob
> >
> >--- In TekScopes@..., David davidwhess@ wrote:
> >>
> >> I would look for some other problem. I have yet to find a shorted
> >> trace in one of these.
> >>
> >> Defocusing the beam when testing unknown plug-ins can save the CRT
> >> from damage.
> >>
> >> On Thu, 06 Jun 2013 02:21:52 -0000, "tekloverbob"
> >> bob654321@ wrote:
> >>
> >> > 7D15 with very nasty short on -15V
> >> >... almost made me cry the first time I plugged this plug-in into my 7904 scope and turned it on! I an instant, before I new what happened the scope put full beam current into a small dot in the middle of the crt display... I now have a permanent hole burnt into the phosphor :(
> >> > With an ohm meter I found shorts on the +15v and the -15v lines of the plug-in. I checked all the tantalum caps and replaced one that fixed the +15v. The -15v is still shorted and appears to be a very solid short (I am thinking a PCB trace to ground plane short) close to the -15v input. I supplied 0.5A - current to this point and only measured -400uv to gnd. Does anyone have available drawings of the PCB layout that shows the middle layer traces? I would like to cut and isolate the -15v line. Any other suggestions? Thanks, Bob
> >>
> >
>
Re: 7D15 with very nasty short on -15V ... almost made me cry the first time I plu

cheater cheater
 

Hi Bob,

On Thu, Jun 6, 2013 at 4:21 AM, tekloverbob <bob654321@hotmail.com> wrote:
7D15 with very nasty short on -15V
... almost made me cry the first time I plugged this plug-in into my 7904 scope and turned it on! I an instant, before I new what happened the scope put full beam current into a small dot in the middle of the crt display... I now have a permanent hole burnt into the phosphor :(
I'm sorry for your loss. Was this with the trace brightness turned all
the way up? Or was it turned down? Can such a short override the
brightness level setting on the scope?

Thanks,
D.
Re: Impossible Photo except on a 7000 scope

cheater cheater
 

Hi everyone,
in case it hasn't arrived the first, second, etc time it was said in
this thread, there are NO AUCTIONS WITH 7J20 ON EBAY, it was an error,
they are 7*DEEE*20's.

Let's not make this thread into a junkyard scrounging festival.
D.

On Thu, Jun 6, 2013 at 8:12 AM, Miroslav Pokorni <mpokorni@ieee.org> wrote:
Hello Mark,

In your reply to Dennis, you said that there are 3 7J20s on e bay;
please, send me item numbers for them, my search does not turn out any
7J20s.

Thank you,

Miroslav Pokorni


On 6/5/2013 2:33 AM, Mark Wendt wrote:
On 06/04/2013 07:51 PM, Dennis Tillman wrote:

Hi Larry,
Best estimate is ~40 were actually built. I know of 6 that are in use or at
least in safe hands. Since they are so valuable and since there are so few I
try to keep in touch with the others that have them and share resources. I
recently discovered that an ExTek friend of mine for many years was directly
involved in their design and marketing.

Since the 7J20 is so unusual it is of interest to very few people so I don't
often mention it. Such was the case with my friend. Quite by accident I saw
he had the 7J20 manual and that is when I discovered his connection to it.

They are a brilliant use of CRTs and scan converters. There are very few
other instruments that can do what a 7J20 does and the prices for those
were/are 10x to 20x the price of the 7J20.

Dennis
Dennis,

Your timing, as usual, is impeccable. There are currently three 7J20's
up for auction on Ebay right not. ;-)

Mark


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

Yahoo! Groups Links





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

Yahoo! Groups Links
Re: Defocus the beam when testing a plug-in

cheater cheater
 

Thanks for top-posting this. I'd have never thought about reading that
other thread. Safety first!

On Thu, Jun 6, 2013 at 7:08 AM, Robin Whittle <rw@firstpr.com.au> wrote:
In "7D15 with very nasty short on -15V ... almost made me cry the
first time I plu", in which Bob reported a faulty plug-in caused his
7904 scope to burn a hole in its phosphor, David Whess wrote:

Defocusing the beam when testing unknown plug-ins can save the CRT
from damage.

I had never thought of this excellent advice, so I have mentioned it
here with a suitable title in the hope that other people like me get to
know it.

- Robin http://www.firstpr.com.au/tequip/



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

Yahoo! Groups Links
Re: Impossible Photo except on a 7000 scope

Miroslav Pokorni
 

Hello Mark,

In your reply to Dennis, you said that there are 3 7J20s on e bay; please, send me item numbers for them, my search does not turn out any 7J20s.

Thank you,

Miroslav Pokorni

On 6/5/2013 2:33 AM, Mark Wendt wrote:
On 06/04/2013 07:51 PM, Dennis Tillman wrote:

Hi Larry,
Best estimate is ~40 were actually built. I know of 6 that are in use or at
least in safe hands. Since they are so valuable and since there are so few I
try to keep in touch with the others that have them and share resources. I
recently discovered that an ExTek friend of mine for many years was directly
involved in their design and marketing.

Since the 7J20 is so unusual it is of interest to very few people so I don't
often mention it. Such was the case with my friend. Quite by accident I saw
he had the 7J20 manual and that is when I discovered his connection to it.

They are a brilliant use of CRTs and scan converters. There are very few
other instruments that can do what a 7J20 does and the prices for those
were/are 10x to 20x the price of the 7J20.

Dennis
Dennis,

Your timing, as usual, is impeccable. There are currently three 7J20's
up for auction on Ebay right not. ;-)

Mark


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

Yahoo! Groups Links
Re: 7D15 with very nasty short on -15V ... almost made me cry the first time I plu

David Hess
 

The interface board where the -15 volt supply comes in includes the
trigger input amplifiers on schematic 1 which make extensive use of
the -15 volt supply and the gating and control logic on schematic 2
which only uses the -15 volt supply for resistive level shifting and
biasing.

-15 volts is also supplied to the switching regulator on board A8
which produces -5 volts for the ECL logic. You can pull board A8 off
of the interface board without too much trouble after removing two
screws.

I would also remove U43 and U143 on schematic 2 to see if they are
shorting the -15 supply.

On Thu, 06 Jun 2013 04:44:52 -0000, "tekloverbob"
<bob654321@hotmail.com> wrote:

The short has been isolated to the "interface A" board. I can only find a couple of places where the -15 is used on this board and no component that could cause a short except one bypass cap that is ok. the feeds to the other boards and the other boards are ok. Doesn't leave much but the PC board? Bob

--- In TekScopes@yahoogroups.com, David <davidwhess@...> wrote:

I would look for some other problem. I have yet to find a shorted
trace in one of these.

Defocusing the beam when testing unknown plug-ins can save the CRT
from damage.

On Thu, 06 Jun 2013 02:21:52 -0000, "tekloverbob"
<bob654321@...> wrote:

7D15 with very nasty short on -15V
... almost made me cry the first time I plugged this plug-in into my 7904 scope and turned it on! I an instant, before I new what happened the scope put full beam current into a small dot in the middle of the crt display... I now have a permanent hole burnt into the phosphor :(
With an ohm meter I found shorts on the +15v and the -15v lines of the plug-in. I checked all the tantalum caps and replaced one that fixed the +15v. The -15v is still shorted and appears to be a very solid short (I am thinking a PCB trace to ground plane short) close to the -15v input. I supplied 0.5A - current to this point and only measured -400uv to gnd. Does anyone have available drawings of the PCB layout that shows the middle layer traces? I would like to cut and isolate the -15v line. Any other suggestions? Thanks, Bob
Re: Defocus the beam when testing a plug-in

tekloverbob
 

I know it well now! Thanks, Bob

--- In TekScopes@yahoogroups.com, Robin Whittle <rw@...> wrote:

In "7D15 with very nasty short on -15V ... almost made me cry the
first time I plu", in which Bob reported a faulty plug-in caused his
7904 scope to burn a hole in its phosphor, David Whess wrote:

Defocusing the beam when testing unknown plug-ins can save the CRT
from damage.

I had never thought of this excellent advice, so I have mentioned it
here with a suitable title in the hope that other people like me get to
know it.

- Robin http://www.firstpr.com.au/tequip/
Re: 7D15 with very nasty short on -15V ... almost made me cry the first time I plu

tekloverbob
 

I tried this as was in my statement: "The -15v is still shorted and appears to be a very solid short (I am thinking a PCB trace to ground plane short) close to the -15v input. I supplied 0.5A - current to this point and only measured -400uv to gnd."

--- In TekScopes@yahoogroups.com, Bob Albert <bob91343@...> wrote:

Do you measure a short with an ohmmeter, power off?

One way I have found shorts is to push a fair amount of current into it and trace the path with a millivoltmeter. There is always a finite resistance and so you can follow the voltage as it drops to see where the current is flowing.  If you keep the current reasonable you won't overheat anything.

Bob

--- On Wed, 6/5/13, tekloverbob <bob654321@...> wrote:

From: tekloverbob <bob654321@...>
Subject: [TekScopes] Re: 7D15 with very nasty short on -15V ... almost made me cry the first time I plu
To: TekScopes@yahoogroups.com
Date: Wednesday, June 5, 2013, 9:44 PM
















 













The short has been isolated to the "interface A" board. I can only find a couple of places where the -15 is used on this board and no component that could cause a short except one bypass cap that is ok. the feeds to the other boards and the other boards are ok. Doesn't leave much but the PC board? Bob



--- In TekScopes@yahoogroups.com, David <davidwhess@> wrote:

I would look for some other problem. I have yet to find a shorted
trace in one of these.
Defocusing the beam when testing unknown plug-ins can save the CRT
from damage.
On Thu, 06 Jun 2013 02:21:52 -0000, "tekloverbob"
<bob654321@> wrote:
7D15 with very nasty short on -15V
... almost made me cry the first time I plugged this plug-in into my 7904 scope and turned it on! I an instant, before I new what happened the scope put full beam current into a small dot in the middle of the crt display... I now have a permanent hole burnt into the phosphor :(
With an ohm meter I found shorts on the +15v and the -15v lines of the plug-in. I checked all the tantalum caps and replaced one that fixed the +15v. The -15v is still shorted and appears to be a very solid short (I am thinking a PCB trace to ground plane short) close to the -15v input. I supplied 0.5A - current to this point and only measured -400uv to gnd. Does anyone have available drawings of the PCB layout that shows the middle layer traces? I would like to cut and isolate the -15v line. Any other suggestions? Thanks, Bob
Re: 7D15 with very nasty short on -15V ... almost made me cry the first time I plu

Bob Albert
 

Do you measure a short with an ohmmeter, power off?

One way I have found shorts is to push a fair amount of current into it and trace the path with a millivoltmeter. There is always a finite resistance and so you can follow the voltage as it drops to see where the current is flowing.  If you keep the current reasonable you won't overheat anything.

Bob


--- On Wed, 6/5/13, tekloverbob <bob654321@...> wrote:

From: tekloverbob
Subject: [TekScopes] Re: 7D15 with very nasty short on -15V ... almost made me cry the first time I plu
To: TekScopes@...
Date: Wednesday, June 5, 2013, 9:44 PM

 



The short has been isolated to the "interface A" board. I can only find a couple of places where the -15 is used on this board and no component that could cause a short except one bypass cap that is ok. the feeds to the other boards and the other boards are ok. Doesn't leave much but the PC board? Bob

--- In TekScopes@..., David wrote:
>
> I would look for some other problem. I have yet to find a shorted
> trace in one of these.
>
> Defocusing the beam when testing unknown plug-ins can save the CRT
> from damage.
>
> On Thu, 06 Jun 2013 02:21:52 -0000, "tekloverbob"
> wrote:
>
> > 7D15 with very nasty short on -15V
> >... almost made me cry the first time I plugged this plug-in into my 7904 scope and turned it on! I an instant, before I new what happened the scope put full beam current into a small dot in the middle of the crt display... I now have a permanent hole burnt into the phosphor :(
> > With an ohm meter I found shorts on the +15v and the -15v lines of the plug-in. I checked all the tantalum caps and replaced one that fixed the +15v. The -15v is still shorted and appears to be a very solid short (I am thinking a PCB trace to ground plane short) close to the -15v input. I supplied 0.5A - current to this point and only measured -400uv to gnd. Does anyone have available drawings of the PCB layout that shows the middle layer traces? I would like to cut and isolate the -15v line. Any other suggestions? Thanks, Bob
>
Defocus the beam when testing a plug-in

Robin Whittle
 

In "7D15 with very nasty short on -15V ... almost made me cry the
first time I plu", in which Bob reported a faulty plug-in caused his
7904 scope to burn a hole in its phosphor, David Whess wrote:

Defocusing the beam when testing unknown plug-ins can save the CRT
from damage.

I had never thought of this excellent advice, so I have mentioned it
here with a suitable title in the hope that other people like me get to
know it.

- Robin http://www.firstpr.com.au/tequip/
Re: 7D15 with very nasty short on -15V ... almost made me cry the first time I plu

tekloverbob
 

The short has been isolated to the "interface A" board. I can only find a couple of places where the -15 is used on this board and no component that could cause a short except one bypass cap that is ok. the feeds to the other boards and the other boards are ok. Doesn't leave much but the PC board? Bob

--- In TekScopes@yahoogroups.com, David <davidwhess@...> wrote:

I would look for some other problem. I have yet to find a shorted
trace in one of these.

Defocusing the beam when testing unknown plug-ins can save the CRT
from damage.

On Thu, 06 Jun 2013 02:21:52 -0000, "tekloverbob"
<bob654321@...> wrote:

7D15 with very nasty short on -15V
... almost made me cry the first time I plugged this plug-in into my 7904 scope and turned it on! I an instant, before I new what happened the scope put full beam current into a small dot in the middle of the crt display... I now have a permanent hole burnt into the phosphor :(
With an ohm meter I found shorts on the +15v and the -15v lines of the plug-in. I checked all the tantalum caps and replaced one that fixed the +15v. The -15v is still shorted and appears to be a very solid short (I am thinking a PCB trace to ground plane short) close to the -15v input. I supplied 0.5A - current to this point and only measured -400uv to gnd. Does anyone have available drawings of the PCB layout that shows the middle layer traces? I would like to cut and isolate the -15v line. Any other suggestions? Thanks, Bob
Re: OKI semiconductor part, MSM6203RS

Merchison Burke
 

No. The IC Master data book does not give full information. It only gives one short line. Exactly what I wrote.

Web search gave me this info:


MSM6203RS

OKI Electronic Components
Search: MSM6203RS <http://www.datasheetarchive.com/MSM6203RS-datasheet.html>
Microprocessor Slice Circuit - Gen Purpose Arithmetic un
Maximum Clock Frequency (Hz)=4.00M
Vsup Nom.(V) Supply Voltage=5.0
Package=DIP
Pins=N/A
Military=N
Technology=CMOS

On 2013-Jun-03 4:47 PM, kiloowatt wrote:
Hi Merchison ...

Kinda figured the arithmetic function, but does the data book have the full information with pinouts etc.? The IC Master probably does not have full data. Darn..

The offer of 100pcs still stands. forever grateful if you can provide photocopy of the full data notes, I have only the 1990 OKI data books. Seems that the part was 1984 vintage and discontinued in 1990.

Some divider/multipliers make rally good inverse counters etc.

regards,
KW

****

--- In TekScopes@yahoogroups.com, Merchison Burke <merchison@...> wrote:
In the 1987 IC Master data book, it is listed as both an 8x8 Multiplier
and a 16/8 Divider.


On 2013-Jun-02 5:58 PM, kiloowatt wrote:
--- In TekScopes@yahoogroups.com, "Carlos" <curbinap@> wrote:

--- In TekScopes@yahoogroups.com, "kiloowatt" <nosprime@> wrote:
Hi all

I have a bunch of MSM6302RS OKI parts /18 pin DIP pkg.

Someone in our group surely must have a 1991 or so data book with the full data sheet. All I can find is an entry in a oki product guide 1991 issue saying it is an arithmetic chip and in a category called a peripheral chip.

I would give someone 100 of them free if they can find the full data.

IC addict
KW
I've several OKI data books from 1990-1991, but that IC does not appear in them. I've also two OKI master selection guides (one from 1991, the other has not a publishing date printed), but the MSM6302RS is not listed, even on the CMOS peripherals section.

Very strange... have you tried to contact OKI directly?

Regards,

Carlos
Hi Carlos
Tried to, but I suspect that it is too old for OKI to id them. I did searches of all the IC datasheet sites and a few search engine checks. I found the part in a 1990 Master Selection Guide.
&#92;&#92;&#92;&#92; I feel sheepish, the real number of the chip is MSM6203RS not 6302.

eager beaver
KW







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Checked by AVG - www.avg.com
Version: 10.0.1432 / Virus Database: 3184/5877 - Release Date: 06/02/13



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No virus found in this message.
Checked by AVG - www.avg.com
Version: 10.0.1432 / Virus Database: 3184/5879 - Release Date: 06/03/13
99201 - 99220 of 192929