Re: RESOLVED: EMC is poorly designed and implemented.

[John Sheahan <jrsheahan-at-optushome.com.au>]

On Wed, Jan 30, 2002 at 11:30:18PM -0500, Keith R. Bolson wrote:
> 
> RESOLVED: EMC is poorly designed and implemented.
> 

>   What I see in the implementation is wasteful, redundant access to
> I/O ports, lack of insight into floating point speed considerations,
> poor factorization into subroutines and far too many scattered ifdefs
> for reliable code.

reducing unneeded IO port accesses on the ISA bus is an excellent
thing to do, good observation.  ISA is SLOW. 

saving the odd floating point access on a pentium does not buy you a
lot, however.   Having recently done a lot of PIC code, I think you 
have to make a *lot* of pic-based boards before they are a competitive against
PC's for number crunching or UI.  

And there are a lot of embedded micros that would better serve as
stepper drivers than a pic. Good timer hardware is an obvious weak area.

what are the EMC design issues you have identified?

regards, john