Kempston Joystick Interface: Difference between revisions
Jump to navigation
Jump to search
m (Remove from Category:Hardware) |
No edit summary |
||
| (5 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
[[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. | |||
The interface uses standard Atari-style joysticks. | |||
Port $1f | |||
Bits are active high so 00=nothing pressed. | |||
{| class="wikitable" | |||
!Bit | |||
!Mask | |||
!Usage | |||
|- | |||
|0 | |||
|00000001 | |||
|Right | |||
|- | |||
|1 | |||
|00000010 | |||
|Left | |||
|- | |||
|2 | |||
|00000100 | |||
|Down | |||
|- | |||
|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 | |||
|} | |||
Latest revision as of 18:22, 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 standard 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 |
| 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 |