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ZM56 Mod

PC Jr ZM56 ROM

Instruction on how to modify your PC Jr main board in various ways to allow for Upper Memory Blocks to be added on side-cars in the ‘D’ and ‘E’ segments as well as a very experimental modification to allow 128 KB independent CGA video RAM from 640 main memory.

SuperCART

PC Jr Super Cartridge

Cartridge replacement board that allows up to 512 KB of cartridge ROM images in a single slot fully select-able via DIP switches good weight loss supplements.  It also allows you to replace your system BIOS with an image contained in the Super Cartridge.

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