Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

   ◄Summary►  ◄Detail►  ◄Example►  ◄Key to Flags►
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Input from Port                                  Flags:  O D I T S Z A P C
Syntax:  IN accumulator,port                             ═════════════════
 
 
  Transfers a byte or word from a port to the accumulator register.  The
  port address is specified by the source operand, which can be DX or an
  8-bit constant. Constants can only be used for port numbers less than
  255; use DX for higher port numbers.
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