My RC2014 runs ColecoVision games (including SGM & MegaCart) from CP/M

[Aaron Mavrinac]

To make this work starting from a stock RC2014 Pro, I had to:

1. add a TMS9918 video card
2. add a SN76489 sound card
3. add a controller interface (and some controllers)
4. add a 3.579545 MHz oscillator as main clock (alternatively, halve the onboard clock to get close)
5. hack the standard Pageable ROM module to avoid a port conflict
6. add a AY-3-8910/YM2149F sound card (for SGM games)
7. design a RAM module with CP/M-compatible bank-switching logic up to 512KB
8. modify J. B. Langston's CP/M game loader to handle MegaCart games

Steps 1 - 5 get you running original ColecoVision games and are primarily thanks to J. B. Langston.

Step 6, plus at least 32KB of RAM, makes Super Game Module games work. I run both sound cards (plus a SID-Ulator as well) through a mini mixer to combine.

Steps 7 and 8 are my contribution, to allow modern homebrew games using the MegaCart with ROMs up to 512KB to load into RAM.