Why do you need a 387 to run X11R3?

Peter da Silva peter at ficc.uu.net
Mon Mar 12 07:31:41 AEST 1990

In article <20203 at nuchat.UUCP> steve at nuchat.UUCP (Steve Nuchia) writes:
> When I cut my teeth, unix systems without FP hardware did the
> emulation thing in library routines that were 10 to mayby
> 100 time slower than hardware, so a program that would spend
> 10% of its time doing FP would slow down by less than ten times.

I'm moderately sure that Version 7 UNIX on the PDP-11 trapped an illegal
instruction and emulated it, just like the 80386 UNIXes do. It might be that
the PDP-11 was just quicker at handling the fault. I'm *sure* that the PDP-11
instructions were easier to parse than the 80386 ones. :->.
 _--_|\  `-_-' Peter da Silva. +1 713 274 5180. <peter at ficc.uu.net>.
/      \  'U`

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