Andrei, I've just started using PICs. I found Microchip's IDE MPLAB to be invaluable and it's FREE! Find yourself a fast internet connection, download it, and print out the manual; the first 2 chapters walk you through an example where you compile some assembly code and then run it on the simulator while watching variables change. Learn to set break points and also how to use watch windows to look at your variables. When you press F9 to run the program, the watch window is NOT updated but when you use F7 to step through the code line by line, watch window variables ARE updated. I used this method to test and debug my first PIC program. Ted Mawson Ted.Mawson@PortfolioPM.com www.portfoliopm.com -----Original Message----- From: Andrei B. Sent: Tuesday, January 29, 2002 6:32 AM Can someone look over this macro I wrote for a software serial RX on the 16f84 @ 4MHz ? I'd like a second opinion before I test it. xxxxxxx deleted xxxxxxxx -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.