krap Posted January 10, 2023 Share Posted January 10, 2023 Hi, Does anyone have the Atari PC4 SCSI version, or at least know, what SCSI interface was included in the set? I'm trying to rebuild the PC4, and I noticed that the BIOS I have has the SCSI support. If would be great to add a compatible controller card. Attaching relevant pictures of the BIOS chips and the motherboard revision. Quote Link to comment Share on other sites More sharing options...
+tf_hh Posted March 3, 2023 Share Posted March 3, 2023 Hi, I´ve the same machine (mainboard revision) on my desk. I can´t say if this is genuine Atari, but my PC4 contains a Seagate SCSI card and a Seagate ST277N SCSI harddrive. See the pictures below. Do you have a manual for exact this version? I´ve tried to expand the memory to 8 MByte. 4 MByte (in four SIPP modules with 1 MByte each) where already installed. When I add the next four SIPPs with each 1 MByte, the system starts with 4 MB in total, not 8 MB. The new SIPP modules work fine, when I place them into the first four rows, the machine works also fine. But info about this system is hard to find. Jurgen Quote Link to comment Share on other sites More sharing options...
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