[Info-vax] Y3K for PDP-11 Operating Systems

[Bob Koehler]

In article <iqa6a7$gu8$1 at dont-email.me>, glen herrmannsfeldt <gah at ugcs.caltech.edu> writes:
> 
> I remember stories from near the beginning of the 11/780 about
> the polynomial expansion and bounds check instructions being
> slower than doing either without those instructions.

   On the 11/780, the speed of several of those instructions depended on 
   whether or not you had a floating point accelerator.  The FPA actually 
   did a lot of integer and address arithmatic, in addition to floating
   point.