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From: john@jwt.UUCP (John Temples)
Newsgroups: comp.dcom.modems
Subject: Re: Questions on High speed UARTS
Message-ID: <2287@jwt.UUCP>
Date: 22 Nov 90 16:05:06 GMT
References: <131@cf_su20.cf_su10.Sbi.COM>
Organization: Private System -- Orlando, FL
Lines: 28

In article <131@cf_su20.cf_su10.Sbi.COM> nee@cf_su14.Salomon.Com (Robert Nee) writes:
>1	I read in PC Magazine that in order to use a high speed
>	modem at peak efficiency you must have the 16550 UART
>	chip installed in your computer.

Simply installing a 16550 won't buy you a thing.  You have to have
software that can enable its FIFO mode before you will see any
improved performance.  And if you're running in a single-tasking
environment on a sufficiently fast computer, I don't think you'll see
any benefit from a 16550 anyway.

>2	This 16452 chip is in a socket but it is not of the DIP
>	variety.  I don't know what to call it except that it is
>	is a square socket like the ones 80387sx fit into.  Do
>	they make 16550s that fit into these square sockets.

My National Semiconductor data book shows part number NS16550AV as
being in a "chip carrier package" -- it's a 44-pin square part.

>3	If the answers to these questions we're yes.  Where would
>	you (the experienced high-speed communicator) purchase
>	a replacement high-speed UART.

I've bought 16550s from JDR Microdevices and Pioneer Electronics in
the past, but only in DIP packaging.  I don't know if they have the
PCC packaging as well.
-- 
John W. Temples -- john@jwt.UUCP (uunet!jwt!john)