Dave VanHorn wrote:

> I've had to do it too.  When you need a 2uS delay, what else can you
> practically do?

  Focussing on the PC.

  This *really* frustrates me.  One major reason why the PC was better
than the (of comparable technical capability) Tandy CoCo was the
presence of a hardware timer counting at a *standard* if rather odd
rate.

  Common sense at least as I understand it, is that if you want small
delays, you use this timer for them and *no* future alteration in clock
speed will ever affect it.  There were programs designed to depend on
the 4.7 MHz clock of the XT, but it must have become evident the moment
an 8 MHz machine appeared that relying on the processor speed for timing
was never viable.

  The implication that this vital component may have been "designed out"
of the PC is staggering!
--
  Cheers,
        Paul B.