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From: russotto@eng.umd.edu (Matthew T. Russotto)
Newsgroups: comp.sys.mac.misc
Subject: Re: Mac detecting monitors
Message-ID: <1990Dec17.154100.12938@eng.umd.edu>
Date: 17 Dec 90 15:41:00 GMT
References: <1990Dec17.101821.7517@marlin.jcu.edu.au>
Sender: news@eng.umd.edu (C-News)
Organization: College of Engineering, Maryversity of Uniland, College Park
Lines: 17

In article <1990Dec17.101821.7517@marlin.jcu.edu.au> glmwc@marlin.jcu.edu.au (Matt Crowd) writes:
>I was in a Mac shop the other day, and I watched as the guy in the
>store swapped monitors on the Macs present.  I was amazed when the
>system software appeared to automatically open the screen to the
>correct screen size!  Being used to Amigas, were you have to set 
>preferences to your monitor type, I am wondering how the machine
>knows what monitor is attached.  How is this done, or was I just
>blind??

1) Sleight of hand
2) The guy switched video cards too
3) The card had 'mode sense' hardware, and either the monitor or the cable had
a few diodes in it telling the card what size it was.

--
Matthew T. Russotto	russotto@eng.umd.edu	russotto@wam.umd.edu
     .sig under construction, like the rest of this campus.