Routines
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F300: Wait for a key to be pressed
Used by the routine at F2BE.
Input
D Returns the key value
F300 CALL $F30A Get a key pressed.
F303 JR NZ,$F300
F305 INC D Loop back if nothing was pressed.
F306 JR Z,$F300
F308 DEC D Restore D and return.
F309 RET
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