Leon Brooks <[EMAIL PROTECTED]> writes: > > > > also, the 486sx (at least the first ones) did has a > > > > coprocessor; it was disabled but was still there (though i > > > > don't rember if it was missing pins or some silicon hack). > > > > > > actually, it was a bad bit of circuit if I remember correctly, > > > the co pro was completely un-usable because of it and the cpu > > > was a lower price for that reason. > > > > if I remember rightly it was a batch of i486dx's that had this > > problem, the fpu just couldnt add up properly given the right set > > of circumstances and intel had to change all the affected chips! > > 486sx was 486dx sans FPU
they did have on in their silicon but it was disabled (by bios, missing pins, or hw circuit). it was just a *marketing hack* when you bought a 487 coprocessor, it was in fact a real 486dx and the motherboard uses that one and not any longer the old sx one....
