Upgrading the Mac 128 to 2MB

It was possible to upgrade the Mac 128 to 2MB of memory by piggy-backing RAM chips and building a new selector circuit. In theory it was possible to go beyond 2MB, but then the motherboard wouldn't fit into the original case anymore.

Later we used PCB's with SIMM-sockets of which I don't have any pictures anymore (I sold my 4MB Hack Plus).

The picture below shows a 2MB Mac 128.

In case anyone wants their Mac 128 upgraded: I'm really sorry but I don't have any documentation anymore on how to do it. Sorry.

©2009 Ernst Mulder