Greetings all. I've read somewhere that an '81 has 4 mhz processor and the '92 has a 10 mhz 86k processor. Then why on Earth does the '81 do a standard 1-1000 loop in 7.5 secs and the '92 needs 15??? (the prog looks like this: 0->x; lbl a; x+1->x; if x<1000 goto a; end program.) Oleg.