Learn how to use your Mac 128k or 512k with HyperDrive.
This is the 138 page User’s Manual that goes with the General Computer Corporation HyperDrive upgrade for your Macintosh 128k or 512k. A HyperDrive adds an internal hard drive of 20MB, controller board, and fan. Unfortunately we don’t have the hardware that goes with the manual. This particular manual has a bit of writing on the front cover but is in good overall condition.
Includes the Sept 6, 1985 HyperDrive Update addendum