Schematic showing traces from UE1 (MOS6532) going to LED activity signals and through UD2 MC3446 to the IEEE488 connector.
https://assets.chaos.social/media_attachments/files/112/478/262/301/789/490/original/fc57972ea19e63b1.png
Yeah, I think I've had it wrong. The RIOTs seem to be attached mostly to the IEEE488 port, and the 6522 seems to drive the floppy mechanisms.
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