Maarten Hofman wrote: > 3) The 16F628A is cheaper and can be interchanged for the 16F648A with > very little effort (the 16F648A is about the same price as the 16F628, > and therefore a good deal, unless your design states you don't need > the additional 2KWord). In fact, I bought and assembled the DIY K149 USB-based programmer (and love it, btw) which comes with a '628A chip installed as the controller. Part of the firmware update procedure uses a second '628A to flash the new firmware onto, then you swap. I had only '648A chips, and they Just Worked in place of the '628A. --Michael -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist