8086 DEC Instruction 
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Murugan Andezuthu Dharmaratnam | 
13 February 2021 | 
4335
13 February 2021 | 4335
DEC is an arithmetic instruction that is used to decrement the destination register or memory location by 1.
The destination can be a general-purpose register or a memory location. and it can be a byte or a word.
Following flags are affected
AF, OF, PF, SF, and ZF but CF is not affected
Algorithm:
operand = operand - 1Types of operands supported
Instruction Operands ---------------------------- INC REG memorySample Code
mov bx,100d dec bx ; Value of bx will be 99 decimal