I was going to say that I don't think it's possible since according to the RF5C01A datasheet it is an 18pin part, whereas the A1200 footprint is 20pin and the pins will be messed up. My assumption was that Commodore messed up the circuit/schematics and never bothered to fix it but people claim to have done the mod successfully so maybe Ricoh made it in 20pin too?
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