AAA - 8086

ASCII Adjust after Addition.
Corrects result in AH and AL after addition when working with BCD values.
Algorithm:
If low nibble of AL > 9 or AF = 1 then :
AL = AL + 6 ,
AH = AH + 1,
AF = 1,
CF = 1
else
AF=0,
CF=0

Syntax

AAA

Example

MOV AX, 15   ; AH = 00, AL = 0Fh 
AAA          ; AH = 01, AL = 05 
RET 

Output / Return Value

Limitations

Alternatives / See Also

• AAS - ASCII Adjust Subtraction
• AAM - ASCII Adjust Multiplication
• AAD - ASCII Adjust Division

Reference

http://www.gabrielececchetti.it/Teaching/CalcolatoriElettronici/Docs/i8086_instruction_set.pdf