Making a Commodore 64 Cartridge using a Raspberry Pi Pico #PiDay #RaspberryPi @Raspberry_Pi @kvance

Kevin Vance posts on Twitter his design for a Commodore 64 cartridge using the inexpensive Raspberry Pi Pico microcontroller:

There are three buffer chips on the board to bring the 5V signals down to 3.3V.

When the C64 boots up, it’s reading a 16 KB window of the Pico’s RAM like it’s a ROM. This uses the Pico’s PIO and DMA controllers, so it takes a couple hundred nanoseconds, plenty of time for the Commodore’s 1 MHz clock.

The 6502 code stored in that window copies the 23 KB image displayer program to the C64’s memory in 1 KB chunks, then executes it.

Kevin plans to put up the PCB design, firmware, and assembly code on GitHub.

See more in the Twitter thread here.


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