变速齿轮Delphi实现

{D7+Win98,不能用于2000}
unit MainUnit;

interface

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

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

var
Form1: TForm1;

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;

procedure TForm1.Button1Click(Sender: TObject);
begin
speed($6000);//慢
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
Speed($1044);
end;

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

end.

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