{ **********************************************************************
  ** Program: S1DEB3.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 C port status.
  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 S1DEB3;
{$C-} { Ctrl+C = OFF }

const
CNT=$17; { control and command register of the PPI 82C55 }
PDA=$14; { data register of the A port }
PDC=$16; { data register of the C port }

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 C Port status }
  begin
   LETTURA:=port[INDIRIZZO]; 
   { Put in the variable the contents of the PDC address }
  end;

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

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