Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
DEC Instruction
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  Title:    Decrement                             Flags: O D I T S Z A P C
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  Syntax:   DEC dest                                     ±       ± ± ± ±
 
  See also: INC, ADD, SUB
 
  Description:
 
     Subtracts 1 from the destination operand. Because the operand is
     treated as an unsigned integer, the DEC instruction does not
     affect the carry flag. To detect any effects on the carry flag,
     use the SUB instruction.
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