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Article #1018Re: STRANGE zenith hardware behavior!!!
From: Andrew Pitonyak
Date: Mon, 25 Jan 1993 04:35
Date: Mon, 25 Jan 1993 04:35
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In article <kennehra.727903265@craft.camp.clarkson.edu> kennehra@craft.camp.clarkson.edu (Rich"TheMan"Kennehan) writes: >Hi. I have some questions about the hardware of the Zeniths. I know that >they are IBM compatible, but when I was tinkering around I found some >inconsistencies between what I've seen in manuals and what actually goes on. > >Ok, first of all I found a pin diagram of the 9 pin male serial mouse port. >One of the pins is supposed to supply +5 volts, but when I put my meter on it >it registered +12 volts!!! What the...??? (I did measure it in DC voltage >too) Make certain that you are on the correct pin. TTL represents a 1 as +5 volts where as RS-232-C represents this as -12V. TTL represents a 0 as 0 volts where as RS-232-C represents this as +12 volts. Just read it today while looking at a circuit to use the RS-232-C port to speak to my ham readio gear which uses TTL. andy
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Path: arc1-ca.pugleaf.net!sparky!uunet!cs.utexas.edu!zaphod.mps.ohio-state.edu!magnus.acs.ohio-state.edu!cis.ohio-state.edu!bounce-bounce From: pitonyak@cis.ohio-state.edu (Andrew Pitonyak) Newsgroups: alt.msdos.programmer Subject: Re: STRANGE zenith hardware behavior!!! Date: 24 Jan 1993 23:35:33 -0500 Organization: The Ohio State University Dept. of Computer and Info. Science Lines: 21 Message-ID: <1jvqmlINN58i@mostaccioli.cis.ohio-state.edu> References: <kennehra.727903265@craft.camp.clarkson.edu> NNTP-Posting-Host: mostaccioli.cis.ohio-state.edu