Shared Projects by Tobrew

Commodore 64 PLA replacement board using 2 Lattice GAL20V8B-25 ICs. Original Open Source Design by Daniel Mantione

Direct replacement for the 906114-01 PLA chip

Designed to be plugged into a socket, not to be soldered directly to the PCB. Works on all C64 motherboards. Works with Super Zaxxon, Epyx fast load, custom and alternative KERNALS

The GAL20V8B-25 ICs can be programmed with TL866 programmer.

The required fusemaps and more information are available here: https://www.freepascal.org/~daniel/c64pla/

Parts: GAL20V8B-25LP x 2
Male round pin header 14 pin x 2
IC socket 24 pin x 2

The DRAMduino

The DRAMTester shield is an Arduino UNO shield , to test 4164 and 41256 DRAM. It checks the DRAM with different read/write operations and is based on the work on https://forum.defence-force.org/viewtopic.php?t=1699.

4164 DRAM is found in retro computers such as the Commodore 64, Atari 800XL, Tandy TRS-80, and Acorn Electron.