unit iiro16u;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, Buttons, Registry, ExtCtrls ;

type
  TMainFrm = class(TForm)
    Label5: TLabel;
    GroupBox1: TGroupBox;
    ExitButton: TBitBtn;
    Memo1: TMemo;
    BeginSample: TButton;
    RunTimer: TTimer;
    RelayOut: TPanel;
    OptoIn: TPanel;
    Label2: TLabel;
    Label4: TLabel;
    IsaLabel: TLabel;
    IsaEdit: TEdit;
    procedure ExitButtonClick(Sender: TObject);
   // procedure AddressListChange(Sender: TObject);
    procedure RunTimerTimer(Sender: TObject);
    procedure BeginSampleClick(Sender: TObject);
    procedure FormActivate(Sender: TObject);
    procedure FormCreate(Sender: TObject);

  public
  { Public declarations }
  end;


var
  MainFrm: TMainFrm;
  Address : WORD;
  RunFlag:Boolean;

implementation

uses ACCES32;
{$R *.DFM}

procedure TMainFrm.ExitButtonClick(Sender: TObject);
begin
    Close;
end;

procedure TMainFrm.RunTimerTimer(Sender: TObject);
const
   value:array[0..3] of LongWord=(0,0,0,0);
   i : Integer=0;
var
   j: Integer;
   y: Cardinal;
   msg: String;
begin
    if i < 8 then begin
       value[1] := 0;
       value[0] := 1 shl i;
    end else begin
       value[0] := 0;

       value[1] := 1 shl (i mod 8);
    end;
    if i < 8 then OutPortB(Address,value[0]) else OutPortB(Address+4,value[1]);
    y := gettickcount + 10;
    repeat Application.ProcessMessages; until gettickcount > y;
    if i < 8 then begin
       value[3] := 0;
       value[2] := InPortB(Address+1);
    end else begin
       value[2] := 0;
       value[3] := InPortB(Address+5);
    end;
    inc(i);
    i := i mod 16;
    msg:=StringOfChar('0', 16);
    for j:=0 to 7 do msg[16-j] := chr(ord((value[0] and (1 shl j))>0)+$30);
    for j:=0 to 7 do msg[8-j] := chr(ord((value[1] and (1 shl j))>0)+$30);
    RelayOut.Caption := msg;
    for j:=0 to 7 do msg[16-j] := chr(ord((value[2] and (1 shl j))>0)+$30);
    for j:=0 to 7 do msg[8-j] := chr(ord((value[3] and (1 shl j))>0)+$30);
    OptoIn.Caption := msg;
end;

procedure TMainFrm.BeginSampleClick(Sender: TObject);
begin
    if not RunFlag then
        Address := StrToInt('$'+IsaEdit.Text);

    if RunTimer.Enabled=True then Begin
        RunTimer.Enabled:=False;
        BeginSample.Caption:='Perform I/O';
    end else
    begin
        RunTimer.Enabled:=True;
        BeginSample.Caption:='Stop I/O';
        Outportb(Address+3, $01);
    end;
end;

procedure TMainFrm.FormActivate(Sender: TObject);
begin
    if not RunFlag then
        FocusControl(IsaEdit);
end;

procedure TMainFrm.FormCreate(Sender: TObject);
begin
   if (InPortB($61) = $AA55) then begin
      Application.MessageBox('ACCESNT.SYS not detected. Please copy ACCESNT.SYS into [NT]/system32/drivers and re-run this sample.', 'Warning', IDOK);
   end;
end;

END.