On Sat, 24 Apr 1999 03:29:23 +0200 Mark E'Silva writes: >Any Suggestions ? Rewriting the code is NOT an option, only setting >the >oscal >value is, As the 12c509 and 12c509A ARE 100% equivalent ???????? Not >to >mention >the higher resolution of OSCAL on the 12C509A? If you copy the value left in the EPROM at the factory to OSCCAL, either chip does operate close to 4 MHz, right? That's the way Microchip intended them to be used. For programs that simply copy the factory value into OSCCAL, the "A" version would work the same as the old one. If you're trying to change the OSCCAL setting to operate the oscillator at a speed different from 4 MHz, the process would obviously be different with the "A" version. Very few applications do that, but if yours does, then the two chips aren't equivalent. There may also be some mistakes in the documentation so what you think is a 'maximum' setting isn't. ___________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com/getjuno.html or call Juno at (800) 654-JUNO [654-5866]