Replacement for 82S100 / 82S101 CMB PLA Commodore 64

Replacement of 82S100 / 82S101 CMB PLA for Commodore 64

A CPLD implementation of the classic 82S100/82S101 used, for example, in the Commodore 64.

The WinCUPL code is taken directly from the VHDL made by Thomas 'skoe' Giesel and simply translated into WinCUPL. Skoe did an excellent description in the C64 PLA that is worth reading.

The CPLD used is a Atmel ATF1502ASL-25AU44. The nice thing about this Atmel part is that it is 5V. It is not only 5V tolerant. The L variant is also low power and the slowest part, which is good when emulating older parts.

This small plate is available as a shared project at OSHPark.

Author's GitHub