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Looks like the 8088 coprocessor board as in the Kaypro 4/84 Plus 88: http://q7.neurotica.com/Oldtech/Kaypro/Kaypro488.html The board was made by SWP Microcomputer Products, and available for several other systems: https://retrocmp.de/kaypro/1985-08-20_SWP-Co-Power-88_kay_OCR.pdf

https://www.hpmuseum.net/exhibit.php?swc=5

I have the MPU board for the BYT-8, but no other boards. http://q7.neurotica.com/Oldtech/S100/ByteMPU-2.jpg

That's normal. It's waiting for a <RETURN> (load from drive 1), D2<RETURN> (load from drive 2) or S<RETURN> (load from serial port).

A bunch of Tandy experts, including people who designed hardware and wrote Xenix drivers for the big Tandys hang out on the Tandy Discord: https://discord.gg/gy8GAkGJ

My Documation card reader was working as of a couple of weeks ago.If you feel like shipping them to Central PA, I can read them.

Jay Newirth is still in business: https://jaynewirth.wixsite.com/newsoft

You don't mount the IMD file. Insert the file into the drive and 'tar -tvf /dev/fd0'

Your first system in an "Executive-style" case is actually the second version of the Osborne 1, often called the Osborne 1A. The Executive had 1/2-height drives on the left side of the CRT. http://q7.neurotica.com/Oldtech/Osborne/Executive1L.jpg...

And here's one of them, in the MIT museum and its descendant from the SAGE system.

Try the FOG (First Osborne Group) archives: http://www.znode51.de/fog/

I never saw that, but I do recall guys who made a nest in the cable trays to grab catnaps.

Al Kossow is a member of these forums. He may be willing to scan them, if you ask nicely. :)

David: I have the Lornes-special-osborne-software.zip file. I'll send you a DM. The Computer History Museum has a schematic for the Screen-Pac: https://www.computerhistory.org/collections/catalog/102665657 You could try contacting Al Kossow at Bitsavers to see if he has it scanned.

If you power up the Model 4 with no diskette inserted, or just press the RESET button with no diskette, it won't display anything. If you hold the BREAK key while doing a RESET, it should start up BASIC and you'll see text on the screen. You could ask the seller to try it.

Back in the day, Montezuma CP/M was my daily driver on my Model 4. All my serious CP/M development was done on that platform. The ability to exchange data between different disk formats is invaluable, and you can roll your own format if it doesn't exist in the MMCPM list. MMCPM also had a...

Wrong URL. Try this: https://shopgoodwill.com/item/155973176

Do you have DUTIL.COM on your system disk? It should handle FORMAT.

Are there any CP/M disks in there labeled Holmes Engineering, or VID-80?

First of all, what floppy drive do you have on your x86 machine? 360K or 1.2MB? What drives on on the Zorba? What format are the IMD images? Are they 40-track or 80-track? You might have to change IMD settings depending on the image and your x86 drives. Zorbas typically came with 48-tpi (40...