I was experimenting with this just last week. The TRS-80 CoCo was my first computer and I still have one. A year or two ago I was able to read and write data to

I was experimenting with this just last week. The TRS-80 CoCo was my first computer and I still have one. A year or two ago I was able to read and write data to a modern digital audio recorder. I think a program could be built to write the audio file that the TRS-80 would understand. Then you could translate a code file to audio and LOAD it. I wrote such a program with the help of ChatGPT last week but the wav file didn’t quite sound right. After more research, I think it might be right and I just don’t remember the sound quite right. This post made me think you might be able to go the other way too. I vaguely remember a command to forward the audio cassette (maybe in seconds). The host computer could listen for that forwarding command and respond with its translated wav. Forward 5 seconds could be for API call #5. This would require no extra hardware on the TRS-80 side. You would just connect the audio jacks into a sound card headphone/mic port. Edit: As another commenter posted, serial would probably be much easier. I didn’t even realize it had serial IO.