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Sorry for the Hiatus. I'm back to my project now. I bought the C4PMF from eBay and could not get it to read any of the floppies. I( thought the drive might be bad so I found the same model on a vintage parts site. But, my new problem is the keyboard is completely deal. I can no longer see the D/W/M ...

Thanks Dave. I'll' do that.

I am also looking for a 502 board. If you know anyone selling one, I'm interested.

I bought this unit on eBay and after examining the floppy drive, I learned 2 chips on the back right were missing a pin each. That is why it's not reading the disks. So I am hoping to find another drive for the 4P-MF. I did order a legacy drive from eBay (an IBM drive) which appears to have the same...