ben@cit5.cit.oz (Nino Benci) (10/17/89)
Can anyone please help me with info on converting the Atari ST DMA port to something which looks and operates like a SCSI port. As i don't have full info on the DMA port operation, i have tried but it does not always seem to work properley. Any help would be appreciated. ------------------------------------------------------------------------------ * Nino Benci. ben@cit5.cit.oz * Some times i wonder, Why do we do it * * Chisholm Institute of Technology * But then i'm resigned to the fact * * School of Digital Technology * that we control our own destiny. * * 900 Dandenong Rd, Caulfield East * * * VIC, 3145. Tel (03) 573 2355/2519 * * * AUSTRALIA. * * ------------------------------------------------------------------------------
weber_w@apollo.HP.COM (Walt Weber) (10/20/89)
In the referenced article ben@cit5.cit.oz (Nino Benci) writes: >Can anyone please help me with info on converting the Atari ST DMA port >to something which looks and operates like a SCSI port. The Atari DMA port (ACSI) isn't SCSI. Its layout of the command block does not reserve the first byte for the OPCODE, but instead places the target logical unit number in the high 4 bits and the opcode in the low 4 bits of the first byte. There are also differences in the physical connection, but I'm doing this from (very hazy) memory and don't wish to mislead you. I believe that the best approach for you would be to use either the ICD disk controller or the Berkley Micros Systems 200 disk controller. I KNOW that the BMS 200 will permit you to issue full SCSI commands, and I suspect that the ICD board will also permit that (assumption is based on ICD's tape backup system requiring SCSI commands not permitted in the ACSI scheme). I haven't any information on how to purchase either of these in Australia. I would, of course, be willing to purchase one here for you if you will fly me there to hand-deliver it :-) ...walt... Walt Weber Hewlett Packard NARC @ Apollo Systems Division (508) 256-6600 x8315 People's Republic of Massachusetts -The views expressed herein are personal, and not binding on ANYONE-