If you think in time = money, try a HLL instead of writing in assembler. I'm not connected with the guys of CCS, but I have written a dual port serial solution (one receive, one send) for a 16F877 (1 UART). Code took me about an hour in total, with the first working proto software at around the 15 minute mark... So, in this case it's a pretty straightforward case of cashing out $100 or spending more time developing. However, I don't have any experience with the smaller PICs, so I don't know if CCS can do the same on those. Claudio -----Oorspronkelijk bericht----- As I already mentioned, i like your idea with the PIC12cxxx devices a lot. How much time do you think it would take to develop a stable firmware ? Thomas -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body