TIMEX released a lot of interfaces under its’ own brand.

Joystick, sound, ZX81/TS1000 memory extension interfaces…

But it also released interfaces for its’ unique devices (like the FDD floppy disk system) with are highlighted here.

Furthermore, we were gifted by the designer of it, a TS1045 interface prototype which was never released and aimed to solve the issues of videogame loading from cassettes. It was even presented to the USA mother-company. We also have technical documentation of that interface, which is displayed in a window behind us.