0xfe40 that appears a lot is the system VIA (6522/IC3), it is responsible for the system interrupt timer and the memory offset for scrolling, sound, speech and keyboard. The user VIA isn't required to boot. Put the system VIA back in and try again. I would also recommend Tricky's Test ROM and post images of what that looks like.
Statistics: Posted by maniacminer — Tue Apr 22, 2025 8:21 am