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From: b-davis@utah-cs.UUCP (Brad Davis)
Newsgroups: net.micro.pc
Subject: Re: IBM AT Serial Line Pinouts
Message-ID: <3456@utah-cs.UUCP>
Date: Wed, 28-Aug-85 18:30:30 EDT
Article-I.D.: utah-cs.3456
Posted: Wed Aug 28 18:30:30 1985
Date-Received: Thu, 29-Aug-85 08:44:14 EDT
References: <2077@ukma.UUCP> <311@ecsvax.UUCP>
Reply-To: b-davis@utah-cs.UUCP (Brad Davis)
Organization: University of Utah VCIS Group
Lines: 24

[]

There was one missing connection.  This list was verified from the AT
Tech Ref manual.

>DB-25     PC-AT    Signal source       Purpose
>-----     -----    --------------      --------
>  1          -           --            Protective ground (unconnected)
>  2          3           PC            Send data
>  3          2          Modem          Receive data
>  4          7           PC            Request to send
>  5          8          Modem          Clear to send
>  6          6          Modem          Data set ready
>  7          5           --            Signal ground
>  8          1          Modem          Carrier detect
> 20          4           PC            Data terminal ready

* 22          9          Modem          Ring Indicator

-- 

			Brad Davis
			{ihnp4, decvax, seismo}!utah-cs!b-davis
			b-davis@utah-cs.ARPA