Mike Keitz wrote: > Mike, Thank you very much for this informative response. I have been away from hardware projects for a few years and I am enjoying soaking up all I can about these devices in the last 48 hours. > The C84 is likely in the process of being discontinued. > >3) Can anyone confirm that David Tait's parallel port programmer works > >for both parts? Can you explain what I should do differently for the > >16F84? > > If you have a programmer that supports only 16C84 and no hope of > upgrading it it can still program F84 chips, though you need to set the > PUT bit opposite what it should be and can't enable the code protection. This is what I was looking for. I knew I had seen this in one of the many WEB pages I visited. > If you haven't used a PIC16C5X before, then there's no > need to worry about it. Just concentrate on learning the PIC16X84, which > shares the same 14-bit core with a large number of more advanced PICs > like the 16C6X and 16C7X. I guess you are right. I was using a 16C54 example that does much the same job as I need to do, so that is why I was interested in the differences. Thanks again.