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 PORTW                     Word Access to I/O PortWs                   pp 206

 Syntax:  PortW [HexWordIndex]

 Type:    Word

 Form:    Function or Procedure

 Purpose: Read from or Write to I/O Ports 0..$FFFF.

 Notes:   The PortW array is pre-defined as PortW : Array [0..$FFFF] of Word ;
          Since Turbo Pascal does not have an unsigned Integer, the only way
          to access Port numbers greater than $7FFF is to use hex notation.
          Otherwise, the Port index would be a negative number.


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 Usage:
       VAR
          WordVar     : Word            ;  { Declare a word variable   }

       BEGIN
          WordVar     := PortW [$60]    ;  { Read from port 60h        }
          PortW [$61] := $20            ;  { Write a value to port 61h }
       END.