On Mar 11, 1996 at 07:57, Alan L Mouat of 3:711/934.28 wrote:

 db>> ...if you don't have buffered UARTs, the situation is even worse.
 ALM>
 ALM> I do, that's the thing.  However it's PCMCIA modem which I know SFA
 ALM> about.

I take it therefore that it has its own UART and acts as a serial port unto
itself, rather than plugging into a "normal" serial port?  Maybe
there's something quirky in the PCMCIA setup that it hampering performance?

You're running under DOS/Windows, yes?  Using enhanced serial drivers under
Windows, or just the normal ones?

 db>> If your machine is not fast enough, too many interrupts will end up
 db>> resulting in dropped characters, CRC mismatches, resends, etc. etc.
 ALM>
 ALM> None of those, it's just slower.

Well that's certainly a step in the right direction (no errors).

 ALM> The damned things a new pentium and I'm only doing 14.4

Maybe it's thumbing its nose at such a low DCE/DCE signalling rate?  My new
Pentium hums along quite happily at 28.8.  :-)

Seriously though, if you're running under DOS/Windows then it very well
could be an obscure software setting that is stuffing-up performance -
Pentium or not.  I remember seeing machines slow to a crawl with various
fancy memory managers installed - throw away the memory managers and they
positively flew.  Install something decent (basically anything but DOS or
Windows) as likewise, they flew.

Cheers..

    - dave
    d.begley{at}ieee.org

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