Routines
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CD44: Handle speed up duration
Used by the routines at CD52 and CD6E.
CD44 LD A,($A20C) Decrement speed up counter
CD47 DEC A
CD48 LD ($A20C),A
CD4B OR A Return if not zero
CD4C RET NZ
CD4D XOR A Reset speed mode to normal if counter is zero
CD4E LD ($A20B),A
CD51 RET
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