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Just curious - please try to format or write a floppy disk using this CPU replacement in a standard Apple II and using a standard Disk II controller card.
If it works, great ! If not, you have the same problem why Apple developed the IWM.
Haven't built it yet, though at least two people have built a similar circuit that did work. I'll post when I get that far.
Can't see any traces, but from the placement of what look like pull-up resistors, I assume you're at least isolating pin 1. So I don't see why this would not work.
Ya this was just a screen shot from the 3d viewer, the traces are indeed there and pin one and 5 are isolated. Considered isolating 35 and 36 but it isn't really needed, just an over abundance of caution.