Xref: utzoo rec.ham-radio.packet:2429 comp.protocols.tcp-ip.ibmpc:1696 comp.dcom.modems:4539
Path: utzoo!attcan!uunet!cs.utexas.edu!mailrus!cornell!uw-beaver!ubc-cs!van-bc!skl
From: skl@van-bc.UUCP (Samuel Lam)
Newsgroups: rec.ham-radio.packet,comp.protocols.tcp-ip.ibmpc,comp.dcom.modems
Subject: Re: KA9Q and serial rs232 lines
Summary: Is the NS16550 plug-compatible with the Intel 8250 series?
Message-ID: <302@van-bc.UUCP>
Date: 23 Sep 89 20:36:34 GMT
References: <17680@bellcore.bellcore.com>
Reply-To: skl@wimsey.bc.ca (Samuel Lam)
Organization: Balliffe International, Vancouver, B.C., Canada
Lines: 25

In article <17680@bellcore.bellcore.com>, karn@jupiter.bellcore.com
 (Phil R. Karn) wrote:
>I recommend that you try replacing the 8250 or 16450 chips with National
>NS16550 chips, which have 16-level FIFOs built into the receiver and
>transmitter.
>
>These chips function just like 8250s unless they are explicitly put into
>FIFO mode by software.

Do you mean I can physically replace the 8250 on my serial board with
a 16550?  Wouldn't there be some trouble with the difference between
edge and level triggered interrupts?

Has anyone actually tried this, and how did the 16550 perform compared
to the 8250?

I am interested in this because we use KA9Q as an SLIP-Ethernet IP router
here and it runs wonderfully at 2400 but not at all at 9600, and we would
like to run it at the higher speed.

Thank you very much for your time.

...Sam
-- 
Samuel Lam     <skl@wimsey.bc.ca> or {uunet,ubc-cs}!wimsey.bc.ca!skl