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30123: Divide A by eight, rounding down to nearest integer
Used by the routines at 27495, 27666, 27809, 34385, 37333 and 37571.
30123 RRCA Divide by eight...
30124 RRCA ...
30125 RRCA ...
30126 AND 31 ...and remove remainder
30128 RET Return
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