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    Mac 512k Checkered Pattern

    Hi guys. A quick update after a long time. I found the problem really was with the VIA (6522). It is essential in the Mac startup process. I replaced this chip and now have a working Mac 512 again. So if you're seeing a similar pattern on your Mac 128/512, be wary of ROMs first and then 6522.
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    Mac 512k Checkered Pattern

    Hello everyone. I have a Mac 512K that just displays that checkered pattern at boot. I already replaced the ROMs with those of a working Plus. In fact, even without any ROM, the pattern is the same. The continuity of all ROM pins is fine and voltages are ok, too (recaped analog board). I...
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