"I always wanted one of these (OEM) for the C64 system, but
they're hard to get so I've tried to recreate the cartridge itself for
others to enjoy as well. The C64 Z80 cartridge for the Commodore 64 was created in order to allow you to use a Z80 processor for the CP/M 2.2 Operating System. "
"There was no official schematic released for the OEM Z80 Cartridge , none that I've seen anyway. Ruud Baltissen has taken upon himself the task of documenting the details of the module with a schematic, see his page at http://www.baltissen.org/newhtm/c64_cpm.htm for a lot more information on how the module works. My schematic has been transcribed from the one he made, then a PCB layout was done. Edge connector footprint was borrowed from the Open16KCartridge made by SukkoPera."
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