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This is a Atari MegaRAM Cart board, designed for the Atari PBI & ECI Bus EXtender or ABEX for short.

This Atari MegaRAM is a PortB/PIA emulator which can expand the internal memory of the Atari, using the memory mapped scheme used in the 80s/90s like CompyShop, RAMbo and others.

Atari MegaRAM Cart for ABEX

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