Memory detection fixes for IBM PS/2 machines #6309
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Fix IBM PS/2 model 50 and 60 with 1MB memory, and correct IBM PS/2 model 30-286 maximum onboard memory
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Summary
IBM uses special 30-pin SIMM with presence detection pins on ISA PS/2 Model 30-286 and the MCA PS/2 Model 50/60 machines, and use I/O port 103h to report installed SIMM types on PS/2 Model 50/60. This commit fixes 164 errors using original reference disk for Model 50/60 with 1MB memory. I/O port 103h information comes from PS/2 model 50 schematics.
Checklist
References
IBM PS/2 30-pin SIMM Pinout
IBM PS/2 model 50 Schematics
IBM PS/2 model 30-286 Schematics
IBM PS/2 model 30-286 Announcement Letter