At 12:46 PM 9/10/99 EDT, you wrote: > I've got a design that works with the 16c61, but when I move it >over to the 16c622A, the RC oscillator does not seem to run. Here are >the details: Sometimes on the newer die shrink parts, there is not enough oomph in the oscillator to start the thing going. Had serious problems with the A, B, & C revs of the 509 part--among others. Our solution was to use a CARBON COMPOSITION resistor in series--100K for the watch crystals we were using. The carbon resistors are inherently noisy, and provided enough noise to kick the thing into oscillation very reliably. Don't know how this would work with an RC oscillator, but it couldn't hurt. Cheap fix and fast--should be able to get the parts locally, or in a day from mouser or digikey. Only available in through hole however. Suggest ordering a few of each value from about 20K to 150K so you can experiment. kelly William K. Borsum, P.E. -- OEM Dataloggers and Instrumentation Systems &