{ **********************************************************************
  ** Program: S1DEB4.PAS             Version: 1.1 - 28  Jenuary  1999 **
  ** Firm:     GRIFO(r)         Via  Dell'Artigiano 8/6               **
  **                          40016  San Giorgio di Piano (BO)        **
  **                          Tel. 051-892052  FAX  051-893661        **
  ** Developed by: Tassinari Enea                                     **
  **********************************************************************
  
  This program allows to display on the A port the dip switch status if any.
  In order to make an easier visualization of the status lines, it is 
  necessary to get a 20 pins flat cable for connecting GPC(r)15R CN9 connector
  to TIO 16 CN1 connector, or DEB-01 CN15 connector. }

program S1DEB4;
{$C-} { Ctrl+C = OFF}

const
CNT=$17; { control and command register of the PPI 82C55 }
PDA=$14; { data register of the A port }
PDB=$15; { data register of the B port (dip switch) }

var
STATO:byte;
RIS:integer;
TASTO:char;

procedure INIZIALIZZAZIONE; 
{ Initialization of the control register of the 82C55 }
  begin 
   port[CNT]:=139;
  end;

function LETTURA (INDIRIZZO:integer):byte;
{ read the dip switch status }
  begin
   LETTURA:=port[INDIRIZZO]; 
  end;

procedure SCRITTURA (STATO:byte);
{ write on the A port, the B port status }
  begin
   port[PDA]:=STATO;
  end;

begin {program main }
 clrscr;
 INIZIALIZZAZIONE;
 gotoxy(10,3);
 writeln('VISUALIZATION ON A PORT, THE DIP SWITCH STATUS IN PROGRESS');
 gotoxy(25,4); 
 write('Press any key for exit');
  repeat
   begin 
      RIS:=LETTURA(PDB);
      SCRITTURA(RIS);
   end; 
 until keypressed;
 SCRITTURA(255); { Led off in the end time }
 read(kbd,TASTO);
end.