Re: EMC question

--- 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