Commodore 64 IEEE-488 Cartridge
Autopsy:
from Richard Lagendijk Homepage:
This cartridge makes it possible to use hardware with a IEEE 488 interface with a Commodore C64. This could be a disk drive, printer or hard disk from the CBM / PET computer models.
source: richardlagendijk.nl
Do you have a scan of the instructions seen in the first photo? I have just got bought this same module (tested, working etc) and I would like to know what kind of documentation it originally came with.