The one Marc uploaded is an older version that only includes 9885, the one on museum.net is the replacement that includes both 9885 and 9895.

Paul.

The rest is in the file area.

Oops, the high resolution version of the disk manual was too large to upload into groups.io, so here it is from my Google drive: https://drive.google.com/open?id=1y5avKIQbYggwgH-dgLZ4XXUwa7pVrfne
Marc

Are they in the files area? Interested in looking atb the 9885 manual.

I added two missing manuals for the HP 9825: The Printer Manual (for the HP 9866 printer) and the Disk Manual (for the HP 9885 8" Floppy). David and Al, you might want to add this to your collection.

Hello,

This email message is a notification to let you know that the following files have been uploaded to the Files area of the VintHPcom@groups.io group.

• /HP 9825/9825 Manuals/HP 9825A Printer (HP 9866B) Operating Notes.pdf
• /HP 9825/9825 Manuals/HP 9825A Printer (HP 9866B) Operating Note (searchable).pdf

Uploaded By: CuriousMarc <marc.verdiell@...>

Description:
Manual for HP 9866 Printer and HP 96032 Parallel Interface

Cheers,
The Groups.io Team

Hey Mr Wise-A**, no such thing. That's the whole note (Jack's joke was referring to a program named HARPO in the note).
Marc

Thanks Marc (for the scan) and Steve (for the implementation). A quick read through the manual raises questions about the missing routines, GROUCHO and ZEPPO. Is there another chapter in this volume?
--
Jack
www.computerarium.org

Hi Marc,

Yes, half of the words in the System Programming ROM are devoted to the Store(A$) command. It was the only way to get a listing back into the machine from a saved ASCII printout. I never imagined that the Loveland Instrument Division would use it to programmatically combine HPL program subroutines into completed ATE programs, but it proved very popular for them. It seemed so simple: just jam a line into the keyboard buffer and smack the "store" key with a JSR call. But there were several exceptions to the ASCII program listings compared to the stored program and all of the exception checking ended up consuming half of the ROM.

Chris Christopher was in charge of the HP 9825 firmware effort and he was not at all pleased with my tinkering. He was afraid my abuse of the 9825's live keyboard feature would surface a latent bug in the main language ROM and so he repeatedly told me "Any bugs you find are yours!" None were found, until the 9825S/T conversion turned up a latent bug in my own code, but not in the Store(A$) command. It was in one of the special 98036A register-access commands I'd added. There were two writes misdirected at ROM locations. In the 9825A/B, writes to a ROM address counted as NOPs, so no damage was done. In the 9825S/T with full 16-bit addressing, RAM occupied those locations and the conversion team had to debug the problem of two RAM locations being mysteriously zeroed out for no apparent reason. "Any bugs you find are yours!" is what I told the conversion team. "It works fine on the 9825A/B."

By the way, the Systems Programming ROM was my first and only commercial software-only product. That's how we did it back then at HP. Design and debug hardware one day, run a lathe or mill the next day (under close supervision by the machinists who hated having engineers fooling with a power tool), write code the day after. What's all this specialization stuff?

--Steve

Just added my scan of the missing AN 201-06 Computer Communications HP 9825 - HP 1000. One is a large (45 MB) pdf file with high resolution scan, the other one is a smaller (4.5MB) one with searchable text. They describe communication over HP-IB and Serial, with ways to upload and download program and data from the 9825 to the HP 1000 running FORTRAN helper programs. It can be done, but pretty contrived as expected, I suspect not many people went through the trouble. It uses Steve Leibson's system programming feature "store" command to download programs (Steve did I get this right that you put that function in?). Many thanks to John Lawson for a) rescuing the manual and b) driving it all the way from Nevada to California. Now that's customer service!
Marc

-- 
Steve Leibson

Phone (Cell): 408-910-5992
Phone (Home): 408-292-4930


Please feel free to link to me on LinkedIn


History site: www.hp9825.com

#Iwork4Intel

Just added my scan of the missing AN 201-06 Computer Communications HP 9825 - HP 1000. One is a large (45 MB) pdf file with high resolution scan, the other one is a smaller (4.5MB) one with searchable text. They describe communication over HP-IB and Serial, with ways to upload and download program and data from the 9825 to the HP 1000 running FORTRAN helper programs. It can be done, but pretty contrived as expected, I suspect not many people went through the trouble. It uses Steve Leibson's system programming feature "store" command to download programs (Steve did I get this right that you put that function in?). Many thanks to John Lawson for a) rescuing the manual and b) driving it all the way from Nevada to California. Now that's customer service!
Marc

Hello,

This email message is a notification to let you know that the following files have been uploaded to the Files area of the VintHPcom@groups.io group.

• /Application Notes/AN 201-06 Computer Communications HP 9825 - HP 1000.pdf
• /Application Notes/AN 201-06 Computer Communications HP 9825 - HP 1000 (searchable).pdf

Uploaded By: CuriousMarc <marc.verdiell@...>

Description:
AN 206-01 HP 9825 to HP 1000 Communications

Cheers,
The Groups.io Team

Nice! Looking forward to the next one in the series.

Still working on this. I skipped the idea t keep the 98x6 time value in the RTC. It is an ieee real, 64 bits that the DS2417 is 32 bits, but that is no real problem and besides is it far easier to read two integers. I will just decide on an arbitrary zero date. In my case jan 1 2000 and when I set the time I subtract that from the TIMEDATE and write the result as two integers. When reading I do the opposite, read the two integers, combine and add my zero date.

Code is ready, but I seem to have misplaced the three DS2417's I bought three years ago. Easily done as they are really small...

Hi all
I am new to this forum and I am finding reading the threads very interesting.
I repair and restore vintage computer and have recently started creating Youtube videos showing these.
Recently I repaired an HP9830a and this turned out to be an epic repair and I ended up having to design a new ROM card as the original had failed.
Over 100 failed IC's
For anyone interested here is the first video https://www.youtube.com/watch?v=LweofUSLSRo
There is also a video list for this series.
I am about to repair two more 9830a's and I need some key caps if anyone has any.

Here are some more measurements. 

• cathode of CR103:   +474V
• anode of CR102,102: -288V
• anode of CR101:     -465V
• calculated: from cathode CR103 to anode CR 101: +474V - (-465V) = 939V
• before L101: 34.7V
• behind L101: 34.0V

• across cathode of CR103 to anode of CR101: 934V
  [that is: before passing through R105+R106, R102+R103 (1.8 MOhm each)]

• across J101 (platen connected): 533V
• across J101 (platen disconnected): 514V
  [that is: after passing through R105+R106, R102+R103 (1.8 MOhm each)]

Martin,

The reference being slightly higher would only mean the high voltage would be a bit higher.  The fact that you see 5.2 volts at the - input of U102 would suggest that there is high voltage since it is fed by a voltage divider with approximately 90 to 1 ratio . What do you get at the cathode of CR103?  What sort of a meter are you using?  If it is a digital meter they usually have an input impedance of 10M especially on the higher voltage ranges.

Paul.

Thank you all for your comments and hints. I guess my test equipment is not perfect for these tests and now I am not sure that the platen itself is the problem.

I measured the voltages going into the comparator/op-amp U102.
a: UREF 5V is actually 5.21V in my case (measured at right side of R119)
b: behind R119, at (+) of U102 I see 5.04V (measured at left side of R119)
c: between R109 and R110, at (-) of U102 I see 5.20 V (measured at left side of R109)
(right and left as seen from the rear of the open plotter)

My plan is now to first correct UREF to be closer to 5V. In fact this may be my fault as I replaced the broken 4.99V Zener VR12 on the main PSU board by a 5.1V Zener because I did not have a 4.99V at hand. I believed that with the tolerances this might be o.k. but just believing is only an alternative fact ... So I'll order some 4.9 and 5.0 V Zeners to see what happens .next.

Martin