I've been having issues regarding the floppy drive for this machine. It originally came with a combo unit, but the original was unusable as there were black marks all over the connector board, so it was swapped with a standard 5.25" drive. However, I've been running into configuration issues with it, and there's only so many connectors on the motherboard so I'd have to find a different cable to also plug in a 3.5" drive anyway. I've got this feeling that this machine is configured to only work with a combo drive, and they have been increasingly harder to find, but I'll bet that I'll stop tripping a 662 POST code if one is connected to the unit.