Good news! A new video RAM chip fixed the lingering video artifacts I had. I looked up the IC model that was in it “HM6116LP-2” and found some on eBay. I had to wait a couple of weeks for them to arrive from China, but popped the first one in and it worked like a charm. Now I have four extra SRAM, what to do.
After scant Reddit and YouTube review browsing I ordered up a Rigol DHO814 oscilloscope to take on floppy drive repair. It’s a bit of a letdown that it seems like it’s just a glorified Android tablet with inputs, but maybe they all are these days.
Original chip with problems in center
