A piece of retro data storage gear. A HP 82901M - dual 5.25" floppy disk unit with HP-IB interface.
Not because I needed it; more because it became available for a good price, is fairly rare, and will be compatible with a setup I'm trying to arrange, to drive other HP-IB storage devices.
Pic is after cleaning and a few small fixes.
Without looking it up, who can guess how many K-bytes this thing gets on a floppy?
Introduced in 1980, obsoleted in March of 1985
This is SN: 2101A11418, made around June 1982.
The PDF of the service manual I found at bitsavers is pretty bad, both quality and seeming to be for an earlier model (or had very poor accuracy checking.) So I'm looking for an original, or better PDF
Edit to add:
Density: Double sided, 35 tracks/side, 16 sectors, 256 byte sectors, MFM, hard sectored.
Total capacity: 286,720 bytes. (280KB) Totally proprietary HP file structure.
It powers up, completes self test, sequentially inits both drives, and does respond on the HP-IB bus. But I don't yet have something that can talk with it properly and R/W files.
Update: better photos. BTW, they appear here in reverse order to that entered. Bug in the new photo upload feature?