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I know the earlier release versions of the CSM flight sim and also the gyro programmers had to be modified and an update was made available
to work with later processors AMD K7 or Intel PentiumII or later,but usually the exe gave an exception error in DOS ie wouldn't even run.Only other thing can think of is the gyro PIC chip is faulty and can't be written to & read properly anymore or your cable is wrong or something going on with the computers LPT settings in the BIOS.
If it has other options eg SPP,ECP uni and bi directional,try them all
Also check the LPT's interupt isn't being shared by another motherboard component.Usually they're set at 7 but can be 3 or 5 which is quite often used by soundcards in the DOS enviroment