He specified the PC Compatibility Drive, not the PC Compatibility Board. This isn't the one with the Intel chip that runs DOS, this is the one that lets you use an external 360 KB 5.25" PC floppy disk drive.

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You 'know it alls' make me laugh. Not only do you pick me up on 'potentially' misinterpreting what someone has said, you don't even know yourself what the item he's referring to is called, which is even funnier!

First off, there's no such thing as a PC Compatibility Drive. Is this some term you just made up?

You must be referring to the Apple PC 5.25 Drive, as shown in the picture of my manual for it.

There is also of course a PC Compatibility Card, also as shown in the picture of my manual for it.

You Sir, stand corrected!