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Upgraded my Performa 640CD from 16 Mb of Mac RAM to 52 Mb of Mac ram. The ram for the Dos portion was 32 Mb before and after the upgrade. After upgrading, the Macintosh System 7.5.1 portion seems to run without issue, but when I try to boot into the DOS portion, I get a blank screen. The DOS portion was working before the upgrade. Does anyone know why this might be happening?
First post. Woot! I thought I might share some knowledge and get some feedback on my process, but first the backstory. I have a Performa 640CD I acquired from a longtime client around 12 years ago. She donated it to me because the power supply failed from a lightning strike. I happened to have acquired a Performa 630CD around that same time, so I moved the 640CD logic board over to the 630CD chassis to test it. Lo and behold: the 640CD powered up. Life happened and I promptly forgot about the machine. I got back on a preservation/restoration kick the last couple of years and finall