Ghulam,

your two codes "first after it" and "second after it" are full of mistakes and entirely senseless! Look only at the line "SKIP", for instance, which seems to be a part of the original code, but now makes no sense any more.

As long as such silly lines are in your code, not anyone will help you, I guess...

Try to avoid this interrupt coding at all, if you are a newbie. Instead of this, try to solve this with polling the TI flag:

Transmit the DPL register by moving it to the SBUF register, poll the TI flag until it goes high, clear it, then transmit the DPH register by moving it into the SBUF register, poll the TI flag until it goes high and clear it.

Now you can change the DPTR and jump back to the instructions above.

Kai Klaas