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Kempston Joystick Interface: Difference between revisions
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[[Category:Peripherals]] | [[Category:Peripherals]] | ||
Until the release of the +2 and +3, the Kempston joystick interface and its compatibles were the most common Joystick interfaces available to Speccy owners. | |||
The original version also worked with the ZX-81, but joystick support in ZX81 games was much less common. | |||
Port $1f | |||
Bits are active high so 00=nothing pressed. | |||
{| | |||
!Bit | |||
!Mask | |||
!Usage | |||
|- | |||
|0 | |||
|00000001 | |||
|Right -> | |||
|- | |||
|1 | |||
|00000010 | |||
|Left <- | |||
|- | |||
|2 | |||
|00000100 | |||
|Down V | |||
|- | |||
|3 | |||
|00001000 | |||
|Up ^ | |||
|- | |||
|4 | |||
|00010000 | |||
|Fire! | |||
|} | |||