Subject: Re: Serial changes 1.1-current
To: David Gilbert <dgilbert@jaywon.pci.on.ca>
From: Phil Knaack <flipk@ncremp.ag.iastate.edu>
List: port-i386
Date: 05/03/1996 11:42:23
>	That may be.  However, it's also possible that 38.4 or 56K is
>just too fast for a 386/40 all by itself.  I'd also like to run two
>(or more) modems in the not-too-distant future.  I'm relatively
>resigned to the fact that there is a limit to 'fast' serial chips.

	[Note: this is not a flame or insult.]

	This is nonsense. Remember the old TRS-80 Model III? Remember
the old Moterola SWTPC (6800-based [NOT 68k!])? I had these two machines
talking to each other at 19.2k using interrupt-based drivers with no
problems. (The 6800 ran at 814kHz; yes, that's less than a megahertz.)

	Of course, they weren't doing much of anything else at the time,
and whenever the TRS-80 wanted to access the disk, it had to XOFF (since
the disk interface on the Model III is byte-polled [ICK!]), but they were
otherwise able to keep up.

	And, I used to run PPP across a room to my roommate's 486sx/25 from
a 386sx/25 running Linux, and easily pushed 38.4k. (No FIFO's on either end.)
As soon as I switched to NetBSD, silo overflows crashed the link regularly.
(I know, really cheap network, you get what you pay for, but college 
students do that sort of thing.)

	But I just can't imagine that 38.4k is "too fast" for a 386/40..

Cheers,
Phil
--
Phillip F Knaack               flipk@iastate.edu
Database Programmer, NCREMP    Student Development Group
ISU Extension                  Project Vincent, Iowa State University