For those who have not heard of this particular recent project, I'm trying to disassemble the 2K controller ROM in a Commodore D9060 IEEE-4888 hard disk. Inside the box are a C= board with two 6502s, shared RAM, an IEEE interface and a SASI interface. The drive mechanism is a Tandon TM602S (5Mb, D9060) or TM603S (7.5M, D9090). In between is an OMTI 25011 SASI host adapter. I'm attempting to understand the ROMs enough to either change the drive geometry to something like an ST-225 (since they are so plentiful) or to complete the code on the "DOS board", as it's called, to issue SCSI-1 commands and drive an old 40Mb-200Mb drive at the limit of the Commodore DOS 3.0 physical size (~16Mb, IIRC). To that end, an understanding of the OMTI would be essential. Does anyone out there have docs? I have (badly blurred) copies of the schematics, but no software info. I particularly need to know reads, writes, sense packets and formatting packets as the OMTI implements them. Most important is to learn how reduced write current and write precomp cylinders are set. If it's a command, then that's easy to change. If the OMTI makes assumptions, then it's not so easy. I now know where in the code the drive geometry is set; I just don't know how to affect RWC and precomp, even if I do patch the number of heads and cylinders. Thanks, -ethan ===== Infinet has been sold. The domain is going away in February. Please send all replies to erd(a)iname.com __________________________________________________ Do You Yahoo!? Bid and sell for free at http://auctions.yahoo.com