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Routines |
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Used by the routine at check_user_input.
The Kempston interface answers on port $1F with the stick's switches active high: bit 0 right, 1 left, 2 down, 3 up, 4 fire.
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| kempston | D077 | IN A,($1F) | read the stick | |
| D079 | LD C,$00 | |||
| D07B | BIT 0,A | right: bit 1 | ||
| D07D | JR Z,kempston_left | |||
| D07F | SET 1,C | |||
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