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Associated article: Structured Programming

Tags: Database     Design     

					_STRUCTURED PROGRAMMING COLUMN_
by Jeff Duntemann


[LISTING ONE]


CONST
  COMPORT  = 2;               {  1 = COM1:  2 = COM2: }
  COMBASE  = $2F8;
  PORTBASE = COMBASE OR (COMPORT SHL 8); { $3F8 for COM1: $2F8 for COM2: }

  { 8250 control registers, masks, etc. }
  RBR      = PORTBASE;        { 8250 Receive Buffer Register       }
  THR      = PORTBASE;        { 8250 Transmit Holding Register     }
  IER      = ...
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