Don Dailey wrote:
Rexchess doesn't run on todays computers because they are too fast.
One of the first things rexchess did was measure the speed of the
computer, because it had a function to simulate a specified ELO playing
strength.   You could for example set it to play 1700 strength and it
would adjust it's level accordingly.    These ran on DOS machines.

But that calculation involved a division,  and we didn't expect
computers to get so fast that the calculation would complete in less
than 1/18 of a second, which I believe was the initial resolution of the
timer we used.     So one day I tried running it and it crashes.

Have you tried running it in DOSBox? It has several features to slow down the DOS emulation to enable playing of very old games.
http://www.dosbox.com/wiki/Main_Page

        ~ Ross
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