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Atari PC4 - SCSI version


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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.






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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.







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