Routines
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39446: Control Method: Kempston Joystick
Output
C Control byte
ControlMethod_Kempston 39446 XOR A A=0.
39447 IN A,(31) A=byte from port 31.
39449 AND %00011111 Keep only bits 0-4.
39451 LD C,A Store the result in C.
39452 RET Return.
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