Incidentally, why doesn't DOSBox have an option to act specifically like a given PC, at a given speed? Such as
/basetype 286 /mz 12
/basetype 486dx /mx 66
I can see that this would at best be only an approximation, since two 486DX 66 PCs, for example, could have vastly different hardware so that not only is one PC noticeably faster than the other, but actually the slower one might be faster than the fast PC in a specific component, and also that DOSBox doesn't emulate cycle accuracy (which doesn't matter, of course - DOSBox is brilliant for games!) but wouldn't the ability to choose (roughly) the speed of the emulated PC be useful for some people?
Apologies if I'm missing some obvious technical reason why this is a stupid or impractical option (I probably am).