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From: harrow@exodus.DEC (Jeff Harrow, NCSE LKG1-3/F16 DTN=226-7445)
Newsgroups: net.micro.mac
Subject: Comm./Modem Port Warning!
Message-ID: <527@decwrl.DEC.COM>
Date: Fri, 17-Jan-86 19:37:06 EST
Article-I.D.: decwrl.527
Posted: Fri Jan 17 19:37:06 1986
Date-Received: Sun, 19-Jan-86 04:42:11 EST
Sender: daemon@decwrl.DEC.COM
Organization: Digital Equipment Corporation
Lines: 13

This afternoon I was plugging my Modem port into an extension RS-232 (DB25) 
cable and, as  I fiddled with the plugs to get them to mate, noticed out of 
the corner of my  eye  that  the  Mac's  screen  dimmed toward black at one 
point.  I quickly realized  that this was due to a misallignment of the DB25 
connectors, where, as I attempted to mate them, the grounded portion of the 
female plug apparently shorted the +5 provided on the modem cable!!!!!

I was lucky in that (apparently, and  hopefully!)  no  damage was done, but 
***BE CAREFUL***, as I recall reading that the  current  is  NOT limited on 
these pins.


Jeff