ZX Interface 2

It has two joystick ports and a ROM cartridge slot, which offers instant loading times.

In addition, the pass-through expansion bus provided was stripped, only allowing a ZX Printer to be attached.

Only ten games were commercially released: Paul Farrow has demonstrated that it is possible to produce custom ROM cartridges, including the ability to exceed the 16 KiB design limitation of the ROM cartridges.

This differs from the then-popular Kempston Interface, whose joystick switches are separate to the keyboard and read using a Z80 IN 31 instruction.

It is the twin joystick feature of the ZX Interface 2 that turned out to be its major selling point.