Software Defined Retro ROM (28 pin) rev A
author: piersfinlayson
2 layer board of 0.74 x 1.44 inches (18.9 x 36.6 mm)
Uploaded:
July 03, 2025
Shared:
July 05, 2025
Total Price:
$5.35
This board is an untested prototype of a 28 pin version of SDRR, primarily designed to replace 23128 style ROMs (such as the combined kernal/BASIC ROM in the later C64s).
Replace failed ROMs in Commodore 64s, VIC-20s, PETs, and other retro systems with a $2 microcontroller.
Emulates 2364, 2332 and 2316 ROMs using the STM32F4 family of microcontrollers.
See the project page for more details including firmware, schematics, BOM, fab notes and more.
This board is an untested prototype of a 28 pin version of SDRR, primarily designed to replace 23128 style ROMs (such as the combined kernal/BASIC ROM in the later C64s).
Replace failed ROMs in Commodore 64s, VIC-20s, PETs, and other retro systems with a $2 microcontroller.
Emulates 2364, 2332 and 2316 ROMs using the STM32F4 family of microcontrollers.
See the project page for more details including firmware, schematics, BOM, fab notes and more.
