After a brief illness, (read that Bored while recuperating), I created another addition to PicNPoke, called PicNPort. For those that are interested... It is a tutorial about the I/O Ports on the F84. It covers things like, latches, using the port, addressing, Read, Write, Modify, Floating inputs, Schmitt input, Interrupts, and Pullups etc.. All up there are 17 animated learning modules, some of them interactive, which run for more than 65 minutes. Regards Tony. PS, I had just under 2000 PICLIST Emails when I opened my mail box. Whew!! PicNPoke Multimedia 16F84 Beginners PIC Tools. PicNPoke - PicNPlay - PicNPlan - PicNPrep - PicNPost Plus DT type saver. New addition - PicNPort I/O Tutor. http://www.dontronics.com/picnpoke.html