программирование cpu-188/ ПОМОГИТЕ.

вот текст:

#include <dos.h>
#include <bios.h>
#include <stdio.h>

#define Vector 0x12
#define EOIrqReg 0xff22
#define MskReg 0xff28
#define Mask 0x01

char Flag1;
int Flag;
int Delay;
int d;

void interrupt HandlerTimer1()
{
_DX=0xFF2C;
_AX=inport(_DX);
if(_AL & 0x01)
{
   Delay++;
   if(Delay==500)
   {

    Flag ^=1;
    outportb(0x87,Flag<<1);
    Delay=0;
    Flag1=1;
   }
}
_AX=0x0008;
_DX=0xFF22;
outportb(_DX,_AL);
}


void interrupt (*oldhandlerTimer1)();


void Timer1Init(void)
{
_DX=0xFF5E;
_AX=0x4000;
   outport(_DX,_AX);
_DX=0xFF58;
_AX=0;
   outport(_DX,_AX);
_DX=0xFF5A;
_AX=0x2710;
   outport(_DX,_AX);
_DX=0xFF5E;
_AX=0xE001;
   outport(_DX,_AX);
}


void main ()
{

Flag=0;
Delay=0;

printf(" Hello! Press any key to Quit...\n");
//

   disable();
   oldhandlerTimer1=getvect(Vector);
   setvect(Vector,HandlerTimer1);
   _AX=(inportb(MskReg)&(~Mask));
   outport(MskReg,_AX);

   Timer1Init();
enable();

while(1)
{

if (bioskey(1))
    {

    disable();


      _AX=(inportb(MskReg)|(Mask));
      outportb(MskReg,_AL);
      setvect(Vector,oldhandlerTimer1);


    enable();
      //
      printf(" Process is stopped 2 \n");
      bioskey(0);
      return;
    }
}
}