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This 9-pin plug was standard of many systems of the era, and the joysticks were fundamentally compatible with the ZX Spectrum's Kempston Interface and the Sega Master System.

Kempston Interface plugged into a Spectrum Plus

The Kempston Interface, produced by Kempston Micro Electronics, was the generic name for any interface on Sinclair's ZX Spectrum series of computers that allowed joysticks complying with the de facto Atari 2600 standard to be used with the machine.

Problems had also been reported with the Kempston Interface breaking down on the newer models and it faded slowly into obscurity, although the option to use Kempston joysticks remained in games until the end of the computer's shelf life.

cs: Kempston Joystick Interface

The joystick ports were not compatible with the popular Kempston interface, and thus did not work with most Spectrum games released prior to the launch of the ZX Interface 2.

: Main article: Kempston Interface