Hi Erik,

May be you burnt in childhood.

may be your code was using serial port or interacted the external world I/Os.

I agree with Craig, the time measurement is good on simulators only and only as long as the code is absolutely *internal*.

and I agree that 8052.com simulator is 100% correct for the internal code blocks I posted in the other thread. I have confirmed simultaor's results with paper work.

Simon