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Pascal/Delphi Source File  |  1986-08-04  |  222 b   |  8 lines
  1. Turn video off:   port[$3D8] := mem[$40:$65] and $F7;
  2. Turn back on:     port[$3D8] := mem[$40:$65;
  3.  
  4. port[$3D8] is the CGA display register.
  5.  
  6. code to wait for vertical retrace is:
  7.    while port[$3DA] and $08 = 0 do;
  8.