2023年10月25日 · The Programmable Logic Array (PLA) is a hardware programmable chip in the C64 which only contains combinatorial logic. Designed by Dave DiOrio, the PLA is used to create chip select signals received from various other signals.

2020年7月16日 · One of the most common failures on Commodore 64 units is failure of the PLA or Programmable Logic Array chip. It’s one of the most critical components in the C64, once described by Commodore engineer James Redfield as “glue logic to tie everything together.”

PLA replacement circuit for Commodore 64. Based on dodgyPLA https://github.com/desaster/c64-dodgypla. I showed the design to some friends and they said "neat". Hence the name neatPLA :) What is changed compared to dodgyPLA: 3.6V voltage regulator. Better for logic levels. Still within XC9536XL specs; Cool looking PCB

2021年7月2日 · The Programmable Logic Array (PLA) is a hardware programmable chip in the C64 which only contains combinatorial logic. Designed by Dave DiOrio, the PLA is used to create chip select signals received from various other signals.

2021年1月26日 · If you are a little familiar with the hardware of the Commodore 64 you know that the PLA chip in the Commodore 64 is perhaps the most failing chip of the entire Commodore 64 today. You will find references to these chips under the following references 906114-01, 251064-01 and the 82S100.

The PLA20V8 is a PLA that consists of two GAL20V8B chips from Lattice Semiconductor. The GAL is a programmable logic chip that looks a lot like the original PLA: It has an AND array, followed by an OR array.

The PLA or Programmable Logic Array is a computer chip that handles the memory map and the bank switching of the Commodore 64. Along comes Daniël Mantione who designed this handy device to replace the original PLA chip compatible in most Commodore 64 computers.

2018年1月30日 · Today, the best choice for a CPLD is the XC9536XL, which is quite cheap, and has 5V tolerant IO-pins. While some people have implemented a PLA chip using this particular CPLD, to my knowledge these implementations are closed source. My implementation is basically a realPLA, with a minor differences:

2022年1月22日 · The programmable logic array (PLA) in the Commodore 64 is used to create chip select signals from various other signals, e.g., from the current address. These signals control which chip is to be connected to the data bus. Therefore the PLA is responsible to implement the whole memory map of the C64.

Documentation for the compact version of PLA20V8 - Commodore 64 replacement PLA chip Resources