I work on a program that transfer some data via the LPT port. I need to use very short delays, but can't figure out how to do them less than 1 us. I will run the program on different machines and the best results should be to use interrupts. But how ? I appreciate any help from you. :) /Per-Erik ____________________________________________ Per Erik Klarenfjord Third Base Electronics Triogatan 7 656 36 KARLSTAD Tel: 054-837852 070-3975147 E-mail: pererik@3base.net http://www.3base.net