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.

Awesome discovery. This group is making great progress. With Paul's Flex Disc ROM reverse engineering, you could just copy it to a 9895 8" disk, and with Ansgar Kueckes HPDIR transfer the image back

I'm not an expert on this, but I guess the dark green effect depends on the nature of the sync signals. The sync signal is added to the green video signal, but the sync can be either a high pulse or a

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: Pascal.rar Uploaded By:Rik Bos Description: HP

I’m using a Belinea 10 17 05 and Samsung SyncMaster 720N with both medium (1024 x 768) and high (1280 x 1024) resolution cards. I haven’t noticed any problem with the green color. I know the 1881N

I currently use a NEC 1770NX (the "NX" is important!) and am quite satisfied. Not every monitor with sync-on-green works well, this one does (and looks damn good). I guess for proper operation the

Ok, some remarks about restoring tapes and something about the tapes I have. After a private mail from Jack, I checked my tape inventory. The tapes I have are : 09915-10014 Tape duplication and

I believe a 9875 should be useable to read the data off these tapes, and I think, also to create new tapes. There are commands RF (read file), RR (read record), WF (write file), and WR (write record)

Wow nice find those tapes are indeed rare there is no complete copies known to exist. Paul.

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

Ok, good news. Let me know if I can provide any information. I’ll probably be ready to make an initial release of the base firmware and General I/O ROM disassembly outputs in a few days. Looking

I don't think it is that big a deal I am half way there already with the rig I used to dump the ROMs. The service manual talks about the signals the state machine monitors and what they mean.

A big effort, as you would need to simulate instruction fetches at specific addresses (including the instruction words for the state machine to decode the instruction type) along with the

Now that I think of it, it would be possible to verify the operation of the whole state machine on the A25 card using sometime to provide the appropriate input signals to the card since it is all

I just too a look at the schematic sheets for for the A24 and A25 cards with my scribbled notes. The two cards are largely independent of each other, with only two signal from the A25 board

I kind of expected it would function as a B from what your said before. As David Collins pointed out there is a tape image of the diagnostics at hpmuseum.net but it also notes it is not complete not

The HP 9875 is a stand alone HP-IB DC100A drive. However the one that I have isn’t fully functional yet. When you give it a rewind command it places the tape on the opposite spool than the one the

Here's a link to 9825 system test software. http://www.hpmuseum.net/display_item.php?sw=294 David Collins HP Computer Museum Sent from out of the office