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On and off over the past 5 months I’ve been working on a design for a memory upgrade board which will max out my Mac 512K at 4MB of RAM. I haven’t come across any projects like this in my searches, but if it’s already been done please let me know. I’ve made a schematic with some notes...

I’ve been working on a mod to upgrade my 512K (which has 512Ke ROMs, disk drive, and an 1980s aftermarket SCSI adapter) to 4MB. I tried breadboarding it, but of course that didn’t work, and it’s a total nightmare to troubleshoot. I’m now planning on going straight to laying out a PCB to...