Kartridge Kracker – 1985. Allowed you to dump 8K and 16K cartridges onto a disk to load later. I have not been able to find the software or hardware for this. NOTE the C64 cartridge port AND a Vic-20 port both on this one card! I also scanned the small manual (including an Erratta Page and an index card with a manual correction) in and you can read it here: Kartridge Kracker Manual
More info from Jim Drew: This is a pseudo-copy of the “blue board” that was developed for CompuTron Buisness Systems by Cardco. I wrote the software for it in 1983.
The larger cartridge port is for a 16K VIC-20 RAM expansion. You would copy the C64 cartridge to disk and load it back to the 16K RAM expansion, and write protect the RAM with a dip switch. This emulates a cartridge perfectly. No need to crack anything, like changes to $01.
Screen shots and Video are below.