I had basically the same idea except mine was going to be a DSO utilizing a PIC and a couple of MAXIM A/D converters. My idea for getting precise sample rates was to use the PIC to generate the "clock". The PIC would assert one of the status lines on the parallel port at precise intervals. My PC (running at 233Mhz) would just sit and watch for the status line to go high, then grab the reading and go back to waiting. With the widely varying speed of PC's and their peripheral hardware, this was the only method I could think of that guaranteed precise time intervals. One of these days I hope to get the time to actually build the darn thing. Too many hobbies in Colorado :-), Adam On Wed, 8 Sep 1999 12:18:21 -0300 "Ing. Marcelo Fornaso" writes: > Hi PicListers! > I apologize for the OT, but you are the most talented and funny > bunch of > *consultants* I know. > I need to test some serial signals, and so I've been working in a > very > simple parallel port based logic analyzer. Adam Bryant (age 0x23) abryant@peaktech.com (work) adamdb@juno.com (home) Parker, CO, USA Robotics, RC Airplanes, anything using a PIC ___________________________________________________________________ Get the Internet just the way you want it. Free software, free e-mail, and free Internet access for a month! Try Juno Web: http://dl.www.juno.com/dynoget/tagj.