>have any problems with the 16F8xx and B024 firmware other than EEPROM? The version of chip I have has known problems writing. I have several copies of the 877 programming spec also, with different timings . The current version uses, I believe, '84 mode to burn the 877. SLow but at least it meets all the varieties of spec from Mchip. > BTW, have you used the 16F877's 12-Bit A/D? I'm replacing an existing Only in 8-bit mode (that is, shifted so the LSbits are somewhere else and don't get used. This is the default mode, btw). >very accurate. That's my concern with the 16F877. Given a precision >reference, I wonder if I can get a similar accuracy. However, it would be I would try it, but not get my hopes up. They've never been too good on the analog side of things. Andy ================================================================== Montana Design Tech Support - http://www.montanadesign.com ==================================================================