Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Disable Byte Sign-Extended Opcode
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  Syntax:   OPTION NOSIGNEXTEND
 
  See also: AND, OR, XOR
 
  Description:
 
     The NOSIGNEXTEND option disables the generation of the sign-
     extended form (83h) of the AND, OR, and XOR instructions. The NEC
     V25 and V35 microprocessors do not support this opcode.
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