Paul, I'm "merging" my A with my T, which means that the A minus keyboard assembly is siding unused at the moment. I'm happy to send you the system ROMs (and CPU board stack) if that would be useful.

Over the summer, I was given a beat-up 9825B with a cracked case and broken keyboard keys. It sat on the shelf until recently when, after a conversation with Paul Berger about his ROM project, I reali

The machine is definitely a T - it has the appropriate A24 and A25 boards. The switch on A24 was pushed to the right position (relative to the front of the machine - labeled 24/64) but was nearly immo

I replaced the plotter/memsize slide switch on the A24 board and things are a little clearer although not necessarily better. It seems that the A25 board is invisible to the rest of the system. I show

Craig and Paul, Thanks to both of you for info and suggestions, especially your offers to swap boards for testing. I've got an HP LogicDart that makes it pretty easy to look around for pulsed input, s

Interesting - not much time to play around this morning before leaving for a few days, but I did find that with A25 in place and 64K selected, the system would note the presence/absence of the tape dr

My 9825T seems to be working well as a 9825B even though the A25 board isn't fully functional. I've been able to enter and run programs and I can print to an attached 9866B printer. At this point, it

I figure this is worth a new message topic. Today, I finally relocated 3 boxes of HP 80 series and 9825 items that got lost in storage during a move nearly 10 years ago. I haven't even gotten to the 8

Marc (and everyone else), Yes, we live in exciting times! :>) I'm about to rebuild my HP85 tape drive capstans for DC100 tapes; I don't have the resources for the full DC2000 conversion. Hopefully, DC

Today I found another HP-85 tape of interest - "5010-0567/2630 - CS80 HP85 DIAG TAPE". It is labeled as being in SIF format and part of the HP85 Service System. Again, the existing archived copy consi

For archival imaging, no need, at least initially, to do anything with the bit stream other than to capture it. At that point, either one could attempt to read the image itself or else write it back t

I don't think this moves us ahead - page 15 of the 9877 manual says that "binary files cannot be duplicated with the dupc statement. If binary files are detected on the master cartridge, error 57 will

Does anyone on the list dabble with the other end of the HP calculator/computer spectrum? Anyone with a 2116, 2115 or 2114? I've got a 2116 and a 2114 that have been sitting idle for far too long - ma

I’m glad to see a few others are also involved with these wonderful beasts. If you have a 2116C, you might be interested in additional core planes – some are still available here - http://www.electron

I don’t know the answer but after visiting the treasure trove of 264x service manuals on bitsavers, I’ve got to believe the information you need is in there somewhere. I’m still digesting the cartridg

A recent trip to Los Angeles resulted in a working 9885M drive and so I got back to work on the disk initialization project. The current version of Ansgar Kueckes' HPDir program allows you to create a

Ansgar - re the msus syntax, I don't think it's a bug - it's a feature that you allow more granular addressing, but it wasn't something I was familiar with on my older equipment. I started testing wit

Backing up a step, I'm not really sure how the ROMs should work in my machine. I can't fault Ansgar's disk image if I can't access my disk due to improper ROM function. I have two machines to work wit

After spending the evening testing all several ROMs in all slots of both machines with no luck, I went back and really jammed the ROM into the slot on my A and it went in another 1/4" deeper than it h

Success! Cleaning with Deoxit Red and Gold, along with a sparing application of Nyelube and insertion force went from a ridiculous 15+ lb to a much more reasonable "firm" push. Disc and matrix ROMs wo