24 Jul
2012
24 Jul
'12
11:18 p.m.
http://www.ebay.com/itm/251110295055 looks to me like a prototype cartridge
for the IBM 0341 Four-Inch Diskette Drive (aka 3.9-inch) which was announced
by IBM in 1983 but shortly thereafter withdrawn in favor of the MIC
(Microfloppy Industry Consortium) adaptation of the Sony 3.5-inch design.
I don't think any production units ever shipped but evaluation units may
have shipped. FWIW, it was a single sided 358 kilobyte FM zone recorded
device.
The media spec is at bitsavers and promotional material is at the CHM. I
have a drive photo in my files
Tom