Ethan Dicks wrote: > It's not explicitly labelled, but on 188008-006, part 9D appears to be > the AMD 2900 (at least it has the right number of pins - 40). In any case, > it's not going to be fruitful to reverse-engineer the "controller" board. It > is a standard (for 1982) SASI<->ST-506 adapter board like the Adapted ACB4000 > is for SCSI<->ST-506. I used to have a programmers manual for the board in > the D9060, but I haven't seen it in ten years. The commands sent across the > bus are going to look a lot like SCSI-1 commands. There is very little > difference. The trick is going to be identifying the code that manipulates > the 6522 and equating SASI signal names to bits in the VIA registers and then > seeing what kinds of commands are getting sent. They are going to be > essentially READs, WRITEs and FORMATs. That's all the farther we need to go. Indeed. SCSI is pretty simple - when you get to it. You can see another 6502 SCSI implementation on my homepage, http://www.6502.org/users/andre/scsi64/index.html Also I actually found the SCSI-II standards on the internet, at http://www.leo.org/pub/comp/doc/scsi/index.html Drivers are available on my page. Just look at readblock/writeblock in csascsi1.a65 and see how it all works together. > success. I have enough spare parts that it's worth the effort to me. I > even have a small box of DEC and Quantum 40Mb and 50Mb disks to throw at the > problem. My driver runs an old 80M Seagate ST1096N (SCSI-I) or even a relatively new 4.2G Ultra-Wide SCSI-II drive from IBM :-) (The last one with a 16bit->8bit SCSI adapter :-)) I thought I should mention that just in case it might help analyzing the drive code. Andre -- Email address may be invalid. Use "fachat AT physik DOT tu-chemnitz DOT de" ------Fight SPAM - join CAUCE http://www.cauce.org------Thanks, spammers... Andre Fachat, Institute of physics, Technische Universität Chemnitz, FRG http://www.tu-chemnitz.de/~fachat - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail firstname.lastname@example.org.
Archive generated by hypermail 2.1.1.