Magic Cartridge Generator is continuation of older version of Magic Desk Cartridge Generator. The name was changed because of adding support for Commodore 264 series machines.
Cartridge hardware is made by Marko Šolajić and can be found at:
Magic Desk compatible C64 cartridge
All programs for the cartridge must be one-file in PRG format (first 2 bytes are the load address). Cartridge and menu programs can be configured with CFG file (more advanced option), otherwise defaults will be used.
