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66BC: Speed up
Used by the routines at 669D and 66AF.
66BC LD A,($5DEC) Get current speed
66BF CP $00 Are we at top speed?
66C1 RET Z Return if so
66C2 DEC A Increase speed
This entry point is used by the routine at 66CC.
66C3 LD ($5DEC),A Set new speed
66C6 LD A,$01 Set bike is moving
66C8 LD ($5DE8),A
66CB RET
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