The standard 9825 tape firmware provides no commands to write binary programs back to tape. Hence the incomplete tape images.

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

Rik and David, thank you for your support. Give me a few days to test the "new" image files and compare with what I have. Maybe I made a mistake or my hardware is ill suited. I hope to come up with a

I'm happy to fix the files on the HP museum site if you can send me good ones... David Collins Curator HP Computer Museum

Martin, I’ve uploaded some Integral disks from another source. You can recreate the images with rawwrite the win version is in the same directory. I’ve checked the Cpp and basic disks and

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the VintHPcom@groups.io group. File: IMG.rar Uploaded By:Rik Bos

Rik, thanks for the offer - right now I acquired a 1MB board and will test this first before proceeding to populate the 512KB board. However I came across another problem with some of the TD0 disk

Thanks to a suggestion by Tony Duell, I determined the unknown instructions are handled by the A25 board mapping circuitry. Instructions with the bit pattern 0701xx trigger a write to a control

I have an NEC EA192-M when I got it I had initially tried it with a 1024x768 98545A card and was disappointed to find it would not sync giving an out of range message. The native resolution

Yes it latches on the falling edge of ALE which means it is actually latching the lower 3 bits of the address, but what I observed on the logic analyzer was address and data where the same. Paul.

Just to make sure I don’t go off on a tangent, the bank register is latching the low order 3 bits of the address used to address the register at the falling edge of ALE, and not the data value

Sure, that would be great. The 16 bit image and the 8 bit images are consistent for address 030313, I expect the other “invalid” instruction location is too. The value being placed into A at

Craig, I can assure you that those instructions get executed and the 9825 does not blow up, I just cranked up my 16700B to check if I had saved any execution traces and there is one, it

Yes. At the moment, I’m looking at the code in bank 0 that appears to be associated with bank selection of the other banks. There are two instructions that my disassembler flagged as invalid bit

Craig: You understand that there are two 1K word windows into the ROM and the bank selection is done by write to the area occupied by the base page ROM, I think my writeup included with the package

I’ve been working on preliminary disassembly of the 9825T ROMs this week, and have some initial symbol information and comments generated for the built in extension ROMs. Nothing to the detail of

Yes, this was my first VCF and I was a bit overwhelmed, not knowing anyone really. I came primarily to meet Jay and learn more about his experience with restoring HP 1000's. I learned more than I

Actually, I just stuck a DC2000 in an unmodified 9825 tape drive , and to my surprise it worked a little bit. The tape fit nicely, transport seemed to work fine, it rewound on the correct reel. I

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,

Rik, thanks so much for the detailed instructions. I am just at the step where I need to do just that, try to read old DC100 tapes.