MacCharlie
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The MacCharlie was a hardware add-on for the Apple Macintosh that was made by Dayna Communications.
It allowed you to run DOS software for the IBM PC, by clipping on a unit to the CPU of the 128K Macintosh and also a keyboard extender to provide the function keys that were absent from Apple's original keyboard.
This additional hardware shipped with 256K RAM and a single 5.25" floppy drive that stored 360K. The unit was expandable to 640K RAM and two floppy drive units.
While running DOS software, you could still access the Macintosh menu bar and desk accessories.