Routines
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CFCC: Handle speed up duration
Used by the routines at CFDA and CFF6.
CFCC LD A,($A073) Decrement speed up counter
CFCF DEC A
CFD0 LD ($A073),A
CFD3 OR A Return if not zero
CFD4 RET NZ
CFD5 XOR A Reset speed mode to normal if counter is zero
CFD6 LD ($A072),A
CFD9 RET
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