bs1.pas

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unit bs1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls,UnitPortTalk;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Timer1: TTimer;
    Edit1: TEdit;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
a1:integer;

implementation

{$R *.dfm}
{procedure speed(count:word);stdcall;
const
ExceptionUsed=$03;
var  
IDT:array [0..5]of byte;  
lpOldGate:dword;  
begin  
asm  
sidt IDT  
mov ebx,dword ptr [IDT+2]  
add ebx,8*ExceptionUsed  
cli  
mov dx,word ptr [ebx+6]  
shl edx,16d  
mov dx,word ptr [ebx]  
mov [lpOldGate],edx  
mov eax,offset @@Ring0Code  
mov word ptr [ebx],ax  
shr eax,16d  
mov word ptr [ebx+6],ax  
int ExceptionUsed  
mov ebx,dword ptr[IDT+2]  
add ebx,8*ExceptionUsed  
mov edx,[lpOldGate]  
mov word ptr [ebx],dx  
shr edx,16d  
mov word ptr [ebx+6],dx  
jmp @@exit  


@@Ring0Code:  
mov al,$34  
out $43,al  
mov ax,Count  
out $40,al  
mov al,ah  
out $40,al  
iretd  
@@exit:  
end;
end; //win98  }

procedure Speed(count:word);       //winnt
begin
  if not OpenPortTalk then exit;
  outportb($43,$34); {写入8253控制寄存器，设置写0号定时器}
  outportb($40,lo(count));  {写定时值低位}
  outportb($40,hi(count));  {写定时值高位}
  ClosePortTalk;
end;




procedure TForm1.Button1Click(Sender: TObject);
begin
Speed($2ea5); // $1044

end;

procedure TForm1.Button2Click(Sender: TObject);
begin
speed($6000);//慢  

end;

procedure TForm1.Button3Click(Sender: TObject);
begin
speed($500);

end;

procedure TForm1.Timer1Timer(Sender: TObject);

begin
a1:=a1+1;
edit1.Text:=inttostr(a1);


end;


end.