Unknown interface cards - TRS-80 ? or earlier?

CheapasstechBE

New Member
Sep 6, 2019
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I found these next to a Tandy Portable Disk drive ... I have no idea what system these are for or what they do ... - last image is a bit blurry

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Dale Mahalko

New Member
Jul 25, 2019
28
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3
The right side image has:
WD1773-PH Western Digital Floppy Disk Formatter/Controller

The left side image mainly just has two PROM chips with opaque stickers over the ultraviolet erasure windows.

I would say that all of these boards really just make up a single drive control circuit, and they were probably plugged together on one end or both ends, on a common bus in a frame with a slot for each board.