Routines
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64034: Capture keyboard input, or jump to joystick reading routine, loading result into A
Used by the routines at 38205, 47502, 47592, 64230 and 64836.
Output
A Stored key-press (bits: 0=LEFT, 1=RIGHT, 2=UP, 3=DOWN, 4=FIRE)
64034 LD HL,23487 Point HL at input control flags and reset all...
64037 LD (HL),0 ...
The operand of the instruction at 64039 represents the start address of the input reading routine for the currently selected input device. This is modified by the instruction at 63611.
64039 JP 64042 Jump to appropriate keyboard / joystick reading routine
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