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Reverse Engineering the CoCo Speech/Sound Cartridge Sound Activity Circuit The Color Computer Speech/Sound Cartridge (S/SC) was one of the more ambitious peripherals Tandy produced for the CoCo line. It packed a TMS-7040 microcontroller, an SPO256-AL2 speech synthesizer, an AY-3-8913 programmable sound generator, and 2K of…

I've been a Homebrew users for a long time. Very nice experience. My only complaint is using it with old operating systems is not a thing they optimize for. But with regard to ToolShed, the disk image tool I contribute to, no one has every…

I recently thought it would be nice to have a picture of every video mode a Color Computer could produce. So I wrote a program to make it easy to do that. You can find this program over on github. I have also taken the…

I wrote a newish 6809 and 6309 disassembler. https://www.macmess.org/follow9.html. Its just two files, an HTML and JavaScript file. Copy them locally, host them on another site, what ever. There is also a git hub so you can do a pull request to help me add…

Demon Attack cartridge (26-3099) has a small bug when running on a CoCo 3. The Programmer's credit and version information is drawn using garbage rather than the correct data from the ROM. This has to do with setting bit 3 of $FF90 causing RAM to…