schematic showing UM3 (MOS6522) going to the motor signals and P2 pinheader
https://assets.chaos.social/media_attachments/files/112/478/266/435/360/380/original/e43ff29572a52eb9.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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