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Joined: Aug 2005
IIRC the (user) RAM chips in the 41CV are 64 registers each. You could remove the faulty one and fit a single memory module in the appropriate port (Port 4, here, I think).
Alternatively (and I did this once), you can crack open the memory module and desolder the PCB from the connector. Then wire the PCB's pads to the holes for the original RAM chip, inside the 41. You need to connect the B3 and B4 pads correctly to put the module at the right address (Look at the I/O assembly schematic in the service manual to see what I mean). That way you still have 4 external ports for ROMs or peripherals.