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Text File  |  1990-03-26  |  358 b   |  16 lines
  1. %====================== port_byte/2           ===============================
  2. /* This program is written specifically for the Color Graphics Adapter */
  3.  
  4. predicates
  5.    border(integer)
  6.  
  7. GOAL  border(0).
  8.  
  9. clauses
  10.    border(Color) :-
  11.       port_byte($3D9, Color),
  12.       Color<15,
  13.       readchar(_),
  14.       NewColor=Color+1,
  15.       border(NewColor).
  16.