Routines
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A921: Pause
Used by the routines at A410, A4C8, A59D, A6FE, A929 and A968.
Input
BC Time to pause for
A921 PUSH AF
A922 DEC BC
A923 LD A,B
A924 OR C
A925 JR NZ,$A922
A927 POP AF
A928 RET
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