SASI device <-> PC ?

On 6/30/05, Jules Richardson <julesrichardsonuk at yahoo.co.uk> wrote: There's a simple SASI implementation buried in the Commodore D9060/D9090 disk drives - I've done a lot of digging around those guys, but have yet to break down and completely reverse-engineer the source, so I am sketching on deep details, but essentially, the D90x0 has a "DOS board" with one 650x CPU talking IEEE-488, the other talking SASI to a Tandon(?) SASI<->ST506 board, then a Tandon TM603S or TM602S drive mech. We've done some playing around, and it's possible to, say, stick an ST225 in there and get it to format as if it were a TM602S (4 heads, 153 cyls of 32 sectors of 256 bytes). I am now getting hazy on if this works (I didn't do it myself), but it might be trivial to patch the firmware to address cylinders up to 255. My biggest concern with those drives is, of couse, the unobtanium nature of 5MB and 7.5MB ST506 drive mechs. I've always wanted to enhance the firmware to a) address disks as large as possible (16MB?) and b) to use a more available medium than ST506 drives. So if anyone learns more about how SASI interoperates with ancient SCSI drives, I'd love to hear about it. -ethan