standard DE-9 connector and was primary designed to work with the ZX Spectrum Kempston joystick interface but also with the compatible ports built into other home computers such as the Amstrad CPC, Commodore 64 (& VIC-20) and later Commodore Amiga and Atari ST. There was also an Atari 5200 model which leveraged the existing CX52 controller for the keypad functionality. References Defunct manufacturing companies of the United Kingdom Home computer hardware companies Game controllers ZX Spectrum Electronics companies of the United Kingdom Kempston Companies based in Bedfordshire