We need to build a system – from new parts – that will run an old manufacturing machine operation program using DOS 6.22 as the OS. We found a suitable motherboard (we need ISA slots) that supports Intel Socket 423 CPUs. We installed a P4 2.4GHz CPU that is on Intel’s embedded list and can still be purchased new. So far, so good. We have a buildable platform that supports the cards we need to put in the system.
Our problem is that the application runs way too fast for the machinery connected to the computer. The motherboard BIOS does not support underclocking, so we cannot slow the computer by that method. We can get a slower embedded P4 CPU, but we we will still be running in the 1.8GHz range, this application was designed to run on a system with a 233MHz clock.
What can we do to slow this system down so that it runs at a speed the machinery can keep up with?
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