Do you have a DINGO by any chance?? Mark

Don't think it's critical but 22k is a good guess.

I recall them being much larger, 22k or even 1M. CMOS here so doesn't need much current. Mark

Does anyone have the "713DIAG" LEX file? I never found it.

You are welcome. I have (I think) 4 of these... 2 work and 2 do not. Repairing the last 2 is on my (long) to-do list. ;-) I would recommend replacing the 74Cxxx parts with 74HCxxx versions. Don't thin

These are 'HC04 and 'HC245 Mark

When I worked at HP Corvallis we made a slew of 75D's (with wand port) that were branded as AT&T I do not recall them having special ROMs built in but there might have been a plug-in ROM. But I don't

Hi Bob, Actually I think most of these names are from the Bambi Disney movies. (at least originally) Mark

The question came from me. I had one of these units years (and years) ago. I recall plugging it into a 75 but it did nothing. (maybe tanked the system... do not remember) Then I moved and had to get r

There's always the ROM simulator (82713A). I wonder if someone smarter than I could "simulate the simulator" in a small PIC or other suitable device? Mark

That's a tough one. One of my ROM simulators (82713A) does this and I never figured out why. (A topic here somewhere). The RAM chips are through hole and not easily replaced. They cut the leads right

Thought so.

Agree with Robert and Paul. Most likely a very early production unit used by engineering. I worked there then (older post here) and repaired many of these. They all had 64k. In fact, I built proto boa

I know I reported the ROM versions in my (4) 75's but cannot find that. Must have been removed/lost/deleted... I recall some as all a's and some as all b's but no mixed versions. My s/n's are at best

I believe the pot in the lower left is the display contrast (voltage) adjust. It may help a bit. The compound looks like electrical contact grease. Not sure who/why. Do not recall HP doing that. And y

That could be SO MANY things. Assume that pulling the batteries and AC adapter (TOTAL reset) does not help. Might be that the board-to-board connection is intermittent. I would pull the back cover (re

Checked my 4 units, one of which is a 75D. 3 out of 4 (including the "D") have bbbbbb 1 unit has aaaaaa. (in my POD) Actually a bit surprised that a mixed ROM set would even work. ~ mark ~

Bob & Group - I have 3 (or is it 4?) 75's and this seems unusual. I will try to check them all and get back to you. ~ mark ~

Hello and Welcome! I have lots of 75 items, these among them. But I thought you could get them for FREE somehow... transferring to a mag card may not be trivial though. If you really want to purchase,

J-F : this is quite interesting. I have not tried the PODPMS1C LEX file as I have stuck with the original Faline PMSCMDS version for years. In the PMS manual, it seems that the BUILD command can accep