Re: EMC question

Yeah, that's the deal... There are different ways around these
problems. But, it's no big science to figure 200+ MHz is P.F.F.
compared a couple KHz needed signal bandwidth and very little
processing for control. The problem surely lies in what the processor
is being made to do beside controlling the step output. The solution
for me will be figuring that out and paring off what I don't need.
It's not so much that I'm trying to avoid using another PC as it is
the next couple of PCs I'd use to run EMC will purposefully be low
power recycled slow pokes working just as hard as they can, and I need
to know what's going on here.

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "jmkasunich <jmkasunich@y...>"
<jmkasunich@y...> wrote:

> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Ray Henry <rehenry@u...>
> wrote:
>
> > A fellow on the emc list had what I think of as similar
> > problems with a PC not keeping up with reading encoders.
> > (Both reading encoders and computing stepping pulses are
> > done on the rt side of the shared memory buffer.) In
> > theory, there isn't much that can get in the way of these
> > things happening. He fixed the problem with a different
> > motherboard.
>
> I have a Pentium II 300MHz machine with similar weirdness.
> Occaisional interrupt latency on the order of 30mS. It was
> losing serial link characters (overrun) even at 2400 baud.
> Switched to a 233MHz Pentium, identical software, runs
> fine at 115,200 baud. I'm guessing it's a funky motherboard,
> although I'll investigate some more before I scrap it.
>
> John Kasunich