I have a 2.80GHZ Pentium 4 - 533FSB Processor running a legacy hardware and software system. This application is SCO Unix and has an old RS422 Serial Card communicating with upto 100 devices on a shop floor for monitoring processes. This client is phasing out this product to replace it with a wireless solution but this needs to run for at least 12 -18 months. The application does not seem to work on this new PC but runs like a charm on an older, slower PC. The problem is when the RS422 card goes out to the devices it only shows the last few devices. It appears that something is timing out or not getting the messages back fast enough for the processor speed. Is there a way to slow the processor down through the BIOS settings (or any other method) to see if this applicatiion will run?