|Excerpt of the schematic showing the Atari 8-bit cartridge edge connector, address and data buses, and decoder logic.|
I use the free "maker" version of Autodesk Eagle. Here are the Eagle libraries used in the design:
- Atari 800 parts, including a cartridge board, is at AtariAge.
- Arduino Nano pinout/footprint on Github.
- NodeMCU (esp8266 board) pinout/footprint on Github.
- 74xx-eu built-in libary. This library had the HCT logic family where the US version did not. I'm not sure that really matters, but just in case....
I am grateful to the generosity of the individuals and organizations who make the tools and information freely available for hobbyist and maker use. That makes fun hardware projects like this possible.