clear cmos

[vicking]

how can i clear the cmos for my laptop Dell latitude D505

[Cary_GRant]

pop out the CMOS battery (on your lappy it's actually motherboard specific and does not use the main laptop battery as most laptops do), anyways you actually have to crack open the back and locate the CMOS battery, then pop it out for about 10 minutes or so, also be sure your main battery is not installed when you remove the CMOS battery.

[Cary_GRant]

.....But if you're the adventurous type, here goes

Add the following code in MFC application or make Win32 Dynamic link library and then add the code. It works fine on Win9x only,
it was not tested on xp/nt and hope it wont work on NT based tech.


int __stdcall Clear_Cmos( )
{
_outp(0x70,0x2E);   //password will get cleared
_outp(0x71,0xFF);

/* if you want to clear whole CMOS
use following code
for(int i=0;i<256;i++)  // whole cmos will get cleared
{
  _outp(0x70,i);
  _outp(0x71,i);

}
*/
return 0;
}

that will totally wipe out your CMOS.