The keyboard encoder in my Apple /// failed and I didn’t want to scavenge another Apple /// to get one. So designed a replacement. And then I thought, why stop there?
I kept going and used my previous work as a base to replace the National Semiconductor MM5740AAE (a.k.a. MM5740AAE/N) keyboard encoder. Got a busted Apple ][ Keyboard? Need an off-the-shelf solution for your hobbyist electronics project? This will fit the bill!
Designed by Joe Strosnider, all key functions have been meticulously mapped, traced and tested. Extra testing and functionality confirmation by Logan Greer and Phillip Allison. Special thanks to Cole Rise for sending me his entire Apple I reproduction system for testing with an “authentic” setup.
Each unit lovingly assembled by hand in Ohio. ♥