Kempston Joystick Interface: Difference between revisions
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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. | 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. | The original version also worked with the ZX-81, but joystick support in ZX81 games was much less common. | ||
The interface uses standards Atari-style joysticks. | |||
Port $1f | Port $1f | ||
| Line 32: | Line 33: | ||
|00010000 | |00010000 | ||
|Fire! | |Fire! | ||
|- | |||
|5 | |||
|00100000 | |||
| Very occasionally a second fire button on some clones, but usually 0 | |||
|- | |||
|6 | |||
|01000000 | |||
| Always 0 | |||
|- | |||
|7 | |||
|10000000 | |||
| Always 0 | |||
|} | |} | ||
Revision as of 18:21, 17 December 2022
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.
The interface uses standards Atari-style joysticks.
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! |
| 5 | 00100000 | Very occasionally a second fire button on some clones, but usually 0 |
| 6 | 01000000 | Always 0 |
| 7 | 10000000 | Always 0 |