DAA             Decimal Adjust after Addition        Flags: O D I T S Z A P C
                                                            ? - - - * * * * *
DAA

        Logic   if ((AL AND 0Fh) > 9) OR (AF = 1)
                   AL ← AL + 6
                   AF ← 1
                else AF ← 0
                endif
                if (AL > 9Fh) OR (CF = 1)
                   AL ← AL + 60h
                   CF ← 1
                else CF ← 0
                endif

    Execute DAA after executing an ADD or ADC instruction on two
    packed BCD operands. The addition leaves a two-digit byte result
    in the AL register. The DAA instruction adjusts AL to contain the
    correct two-digit packed decimal result.


    Opcode      Format
    27          DAA


    Length and timing
    Operands    Bytes   8088    186     286     386     486     Pentium
    -            1       4       4       3       4       2       3   NP