In article: <9506270151.aa14818@punt3.demon.co.uk> fastfwd@ix.netcom.com writes: : : Kenny Baby wrote: : : >On the pic71 I want to use an external clock to increment the RTCC. : >Logic says that you set the RTCC pin as an input, tell the pic that : >the RTCC signal source is on RA4 and hey presto it's supposed to work. : >Well this had me baffeled for around two weeks because it did'nt work. : : Kenny: : : The problem you're seeing is the result of a bug in the "rev A" : 16C71's. The simulator models the parts as they should have been : produced; that's why it behaves differently than your PIC. The : problem's been fixed in the "rev B" parts. Thank you ! I'd just spent most of today trying to figure out a very similar problem. The program would work fine on the simulator but the damn thing was just pulling the RA4 line low when on the board. Will Microchip replace this expensive windowed EPROM 16C71 'rev A' chip (shipped with my PICSTART-16B kit) for one that does as it is supposed to ? Anyone from Microchip listening ? Karel -- ++++++++khladky@khdesign.demon.co.uk++Manchester M14 6BF England++++++++