The CS-80 & SS-80 information is up at bitsavers and linked off the IEEE-488 wikipedia article. Olivier De Smet's HP85 simulator has a 9121 emulation in. I have hpfddcs.pdf - Appendix A of some HP floppy manual documenting the Amigo command set for 9121 & the 5.25 posted by Frank McConnell in 2003 http://www.classiccmp.org/pipermail/cctalk/2003-May/021826.html http://www.reanimators.org/tmp/hpfddcs.pdf This mob http://www.isa-j.co.jp/english/product/HP/HPIB_SCSI/ supplies (expensively) new SS-80 HP-IB drives (Jon has it linked from the 9122 entry on hpmuseum.net). I think I also found a company in England providing CS-80 to SCSI drives for 1000s & 3000s. http://www.reactivedata.com/2-LegacyDiskAndTapeEmulators/leghp1000.htm I think some of the BSDs may have support for CS-80 drives. Since I just got myself a 7980 magtape (HP-IB), source for a unix driver would be really nice. Hope this gets to the list & is useful.