Hi,

Excuse me my poor English. I will try again.

Question :
As it is possible to loose the Boot Vector, I think it is possible to loose the Status Byte too.Isn't it ?
So if you have lost the Status Byte(I mean different of zero), the program will begin at the Boot Vector address, that can be different from 0xFC00 or 0x0000.
In this case, emergency exit (there is a jump in the 0x0000) will not be reach.Will it ?

I have understood teh problem about Boot Vector.
But what about the Status Byte value.

Annibal