Kempston Micro Electronics
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Kempston produced a number of joystick interfaces for the Sinclair ZX Spectrum to allow normal Atari-style DE-9 connector joysticks to be used with it. Apart from implementing existing joystick interfacing modes they produced their own standard which delivered the joystick state on the Z80 bus at port 31 (read in BASIC using IN 31). This meant that the joystick did not produce key-presses like the other standards and the method was soon borrowed by other interface manufacturers and became quite popular.
- x-axis at port 64479
- y-axis at port 65503
- two buttons at port 64223
Formula 1 and 2
Features a base similar in size to a 48K Spectrum, with two fire buttons. Released June 1985.
The Competition Pro consisted of a square base, two large red buttons (for left or right-handed use) and a black pommel stick. It used the Atari 2600 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.