Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!wuarchive!waikato.ac.nz!comp.vuw.ac.nz!actrix!ewen
From: ewen@actrix.gen.nz (Ewen McNeill)
Newsgroups: comp.os.cpm
Subject: Re: Osborne 1, Questions Answered
Summary: Opps!
Keywords: Osborne 1 Serial Port
Message-ID: <1991May30.014325.339@actrix.gen.nz>
Date: 30 May 91 01:43:25 GMT
References: <1991May23.042256.12302@actrix.gen.nz> <7@tdatirv.UUCP>
Organization: Actrix Information Exchange
Lines: 20
Comment-To: pa1@tdatirv.UUCP

In article <7@tdatirv.UUCP> pa1@tdatirv.UUCP (Pat Alvarado) writes:
> In article <1991May23.042256.12302@actrix.gen.nz> ewen@actrix.gen.nz (Ewen McNeill) writes:
> >The RS232 port apparently is
> >only TTL levels, so some line driver/receivr chips would be needed.
>
> The Osborne 1 uses the standard 1488 and 1489 chips to the external port
> of the RS232 interface, and uses +/- 12VDC to drive the signals. 
>
Sorry, folks.  I mis-read the data I was sent.  TX, and RX are held at
normal levels.  Some of the information I was sent, however, noted that
some control lines were held at +5V.  This confused me, when I quickly put
together a summary.

>   |||   Pat Alvarado                | 
>    v    Teradata Corporation        | tdat!pa1@suntzu.sun.com
>  /\ /\  100 N. Sepulveda Blvd.      | uunet!edsews!hacgate!tdat!pa1
> /// \\\ El Segundo, Calif. 90245    | pa1@tdat.teradata.com

-- 
Ewen McNeill, ewen@actrix.gen.nz