On 7/21/2025 9:47 AM, Bill Gunshannon via cctalk wrote:
I have an 11/93 with 2MB of memory onboard. I would like to kick it up to 4MB. I got some memory a while ago that was supposed to be PMI for it but it turned out to be UNIBUS and thus no help. I have some old fashioned QBUS memory module floating around. Will these work to add the missing 2MB or can the 11/93 only use PMI? Would be nice to wake this old box up again. I have this cool Decromancer just crying for somewhere to run. bill
Bill, You can use regular QBUS memory in an 11/93 if you put it after the CPU board. That is, assuming your CPU is in slot 1 (which it probably is), then the QBUS memory goes in slot 2 (and beyond if multiple boards). If you had a separate PMI board then that would go in slot 1 and the KDJ11 into slot 2. Do NOT put the QBUS memory ahead of the CPU, that won't work. Conversely, you CAN put PMI memory after the CPU, it then just functions as a QBUS memory without the performance enhancement. Regards, John H. Reinhardt
