OR               Logical OR                          Flags: O D I T S Z A P C
                                                            0       * * ? * 0
OR destination,source
 
          Logic:    destination  destination OR source
 
    OR performs a bit-by-bit logical inclusive OR operation on its
    operands and returns the result to destination.  The operands may be
    words or bytes.
 
                       OR Instruction Logic
 
                   Destination  Source    Result
                        0         0         0
                        0         1         1
                        1         0         1
                        1         1         1
 
    OR sets each bit of the result to 1 if either or both of the
    corresponding bits of the operands are 1.
 
  --------------------------------------------------------------------------
   Operands                  Clocks   Transfers  Bytes   Example
                           byte(word)
   register, register          3          -        2     OR CH,DL
   register, memory        9(13) + EA     1       2-4    OR BX, MEM_OR_Y
   memory, register       16(24) + EA     2       2-4    OR MEM_OR_Y, BX
   accumulator, immediate      4          -       2-3    OR AL,01110110b
   register,immediate          4          -       3-4    OR CX,00FFh
   memory, immediate      17(25) + EA     2       3-6    OR MEM_WORD,76h
  --------------------------------------------------------------------------

Seealso:


 AND 
 NOT 
 XOR 
 EA 
 Flags