Hallo Didier, > does anybody has an idea about the command set really issued by > the commodore controller to the scsi hard disk ? I'm afraid I have some disapointments for you. - There isn't a SCSI hard disk on board, it is a MFM one. - Between the Commodore controller and this MFM hard disk sits a SASI - MFM converter. It is full of unknown ICs. OK, unknown to me, but those amongst us who know me well, can confirm I have a good knowledge on this area. I had once five systems to repair. I only managed one to revive because I only had one functioning converter. - The Commodore controller has a SASI interface, not a SCSI one. A German friend of mine said that SASI was the predecessor of SCSI so one should be able to attach a SCSI hard disk. So far he hasn't succeeded. - Documentation about SASI is rare. One source is: http://www.swtpc.com/mholley/SASI/SASI_Hard_Drive.htm - Michał pointed me to a PDF as well, you can download it from my sit, please see: http://www.baltissen.org/newhtm/sasi.htm - The third and last source is a Thesis written by Dutch students. Quite informing but.... written in Dutch. Available on request. - I tried to make an interface to the LPT port of a PC with he idea that the PC could emulate the SASI board. But then my C= controller board brooke down :( On the positive site: - I made a disassembly of the ROM of Disk Controller, freely available. - This board does NOT use the 6530, the ROM is an EPROM in this case. The idea with the LPT interface was to gain knowledge. If aquired, I could replace the interface with a micro controller. But a second solution could be to replace the EPROM by one with my own content; not having to use this weird SASI protocol, it would simplify the interfacing. I hope this helped a bit :) -- Kind regards / Met vriendelijke groet, Ruud Baltissen www.Baltissen.org Message was sent through the cbm-hackers mailing listReceived on 2013-11-14 16:00:06
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