Operation
ALborrow AL < 6; (* 1 if true *)
IF (AL AND 0FH) > 9 OR AF = 1
THEN
AL (AL - 6) AND 0FH;
AH AH - 1 - ALborrow;
AF 1;
CF 1;
ELSE
CF 0;
AF 0;
AL AL AND 0FH
FI;
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