The Kempston Interface is a joystick interface used on the ZX Spectrum series of computers that allows controllers complying with the de facto Atari joystick port standard (using the DE-9 connector) to be used with the machine.

This meant that the joystick did not produce key-presses like the other standards, such as Cursor,[1] and the method was soon borrowed by other interface manufacturers and became quite popular.

[citation needed] The Score Board has a base similar in size to a 48K Spectrum, with two fire buttons.

[citation needed] The Competition Pro has a square base, two large red buttons (for left or right-handed use), and a black pommel stick.

It uses the Atari 2600 standard DE-9 connector and was primarily designed to work with the ZX Spectrum Kempston joystick interface; it also works with the compatible ports of other home computers such as the Amstrad CPC, Commodore 64, VIC-20, and later Amiga and Atari ST.[citation needed] An Atari 5200 model uses the existing CX52 controller for the keypad functionality.