Path: utzoo!attcan!uunet!husc6!rutgers!mcnc!unccvax!mru
From: mru@unccvax.UUCP (Markus Ruppel)
Newsgroups: comp.sys.ibm.pc
Subject: Re: What is the difference between XT and AT serial ports
Message-ID: <1232@unccvax.UUCP>
Date: 17 Nov 88 17:23:32 GMT
References: <3078@dalcs.UUCP>
Distribution: na
Organization: Univ. of NC at Charlotte, Charlotte, NC
Lines: 22

in article <3078@dalcs.UUCP>, lane@dalcs.UUCP (John Wright/Dr. Pat Lane) says:
> Keywords: RS232, chips, AT, XT, I/O ports
> 
> I've read that the serial port in the IBM PC and XT is based on the 8250
> chip while for the AT, a 16450 chip is used.  In my AT clone, I notice the
> serial board has an 8250 on it which seems to work just fine.  I'm wondering
> what the difference between these two chips is, 
From the National Semiconductor data sheet:

	"The NS16450 is an improved specification version of the INS8250A
	 Asynchronous Communications Element (ACE). The improved specifica-
	 tions ensure compatibility with the NS32016 and other state-of-the
	 -art CPUs. Functionally, the NS16450 is equivalent to the INS8250A."
	 (typos mine...:-))

Markus Ruppel
Dept. of Chemistry
UNC Charlotte

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