- Raaka Tu
- Madness and the Minotaur
- Dungeons of Daggorath
- Audio Spectrum Analyzer
The Color Computer Reference Manual contains schematics and detailed hardware information.
See the CoCo Hardware Reference on this site.
Spectral Associates -- the people who made Madness and the Minotaur -- produced a series of disassemblies of the CoCo ROMs! Here are those awesome PDFs: