TI/99 4a clone

[seat safety switch]

I shouldn’t have said unobtainable. We’ve discovered that is doesn’t put out the right sounds that you’d expect from the 4A.

Example: the high pitch beep comes out as the low “donk” sound. Not sure if it’s the sound chip itself or something else in the board.

Dumb question, is the data bus around the right way? It's the same "reversed" MSB/LSB orientation as the TMS99xx.

I made an Arduino-and-breadboard tester and had to throw out* one of the SN76489s when I got my first batch of used ones, it sounded weird.

* I put it in my "weird chips" bin. Why would you throw out anything??

 

[rkrenicki]

I am happy to see that this project has continued! My TI-99 itch has come back, and I think I may try my hand at reworking this to fit inside of the original console.