PI> Having just finished a project with the 16550, I can tell you it PI>is very easy to use and initialize... I would suggest checking out PI>National Semiconductor's web site (www.natsemi.com) where they have .PDF PI>documents on line with the complete 16550 manual being one of them PI>(you'll need to do a search on 16550 to find it). The only thing I found PI>annoying about the 16550 was the Intel-ish practice of requiring the R* PI>and W* lines to only be active when CS* is. 1> Is it possible to feed a sequence burst of init/config bytes to the 16550, say from a PC parallel port buffered into the UART so that it could be a standalone UART without CPU supervision? 2>Can the RX & TX sections be linked together as a standalone serial data time shifter ( 8Kbps serial data in->Parallel FIFO Buffer->57.6 Kbps serial data out )? Many DANDY Answers received from around the World...Keep 'em coming! TIA, John sirejohn@bbs-la.com