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View Full Version : adding a coprocessor to a 386



PS1
March 26th, 2004, 07:36 AM
im going to add a a coprocessor to my compaq 386s i have a couple of scrap 386 motherboards with the same socket designation what i wondered is will the chip from one of these work in my compaq?

Terry Yager
March 27th, 2004, 05:19 PM
im going to add a a coprocessor to my compaq 386s i have a couple of scrap 386 motherboards with the same socket designation what i wondered is will the chip from one of these work in my compaq?

Well, yes...and no. If the co-pro is the same speed as the processor it will work. If they are different soeeds, and the BIOS supports asynchronous co-pro speeds, it will work. Some BIOS don't allow the async operation, and others which do, may limit co-pro operation to only half the CPU speed. (So if you have say, a 33MHz CPU and a 20MHz FPU, the FPU will only run at 16MHz in such a system, not the full 20MHz).

--T