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C64 PLA replacement

Overview

The Commodore 64, released by Commodore in 1982, sold over 12 million units throughout its lifecycle, holding the Guinness World Record for "Best-Selling Single Desktop Computer Model." The PLA chip is responsible for memory address decoding. A malfunction manifests as a black screen upon startup. Because the PLA chip (906114-01) has been discontinued for many years, finding an original replacement is difficult. Therefore, a GAL chip can be used for simulation. This project is a re-drawn version of the PLA20V8 project. https://www.freepascal.org/~daniel/c64pla/

Design Files

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Update:2026-03-26 14:34:08

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