Operation
tmpCF 0;
tmpAL AL;
IF (((tmpAL AND 0FH) > 9H) or AF = 1)
THEN
AF 1;
AL AL - 6H;
tmpCF (AL < 0) OR CF;
FI;
IF ((tmpAL > 99H) or CF = 1)
THEN
AL AL - 60H;
tmpCF 1;
FI;
CF tmpCF;
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