CompuThink ExpandaMem for Commodore PET & KIM-1
Autopsy:
The Expandamem of CompuThink (Compu/Think) is a Memory expansion card for Commodore PET (chicklet keyboard) and KIM-1.
The memory expansion was installed inside the Computer Commodore PET and with a particular hook was fixed above the motherboard. The connection was through the expansion bus and a power connector.
The manual suggests a cassette originally supplied with this board called Diagnostic Test Tape. I would be very happy for a copy of this as a downloadable TAP file.