Still waiting but the more I read, the smaller the chances become that the 512k actually has any part of a Hyperdrive in it; let alone, a working one. This kinda makes sense.  If someone were to put out the money to upgrade the stock Macintosh 512k to a Hyperdrive unit, they would be prime candidates for further upgrades that were to come.  I read one thread about a 512k that had the GCC Hyperdrive stickers and it was further upgraded to a Mac Plus class computer with SCSI and even video output.  Those computers would be upgraded and upgraded until they couldn't be upgraded anymore.

Hence what may have happened to yours, Techknight.  The Hyperdrive boards I saw in pictures (and there are very few) had HyperDrive and GCC wrtten on them.  Your Hyperdrive may have ben upgraded further because I have looked and not seen anything beyond the 12 mhz 68000 upgrade for the Hyperdrive 2000.

At least with all my reading I found out I do have one GCC product.  I have a GCC WriteMove portable printer for the Macintosh Portable. I'll probably end up with that and two stickers and maybe an abandoned fan