Will this work on a Brother AT-15?

[JobLeonard]

First of all: super-cool!

Second of all: what model of typewriter did you use and is it different from mine on the keycode level?

[numist]

It's probably different at the keycode level, but it shouldn't be too complicated to print codes over serial while pressing keys on the keyboard to reconstruct the right mapping for your wiring/typewriter.