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From: nitinj@chips.com (Nitin Joshi)
Newsgroups: sci.electronics
Subject: Re: VGA monitors
Message-ID: <2665@news.chips.com>
Date: 24 May 91 19:37:10 GMT
References: <1991May18.074619.18581@kcbbs.gen.nz> <17660167@hpfcdj.HP.COM>
Reply-To: nitinj@news.Chips.com (Nitin Joshi)
Organization: Chips and Technologies, San Jose, CA
Lines: 1

The VGA card has 75 or 150 ohm terminating res on the card, the moniter also has a 75 ohm terminator, The VGA DAC is a current output DAC and so depending on if the moniter is connected or not, the voltage level on RGB lines is different. A comparator senses this and determines no/mono/color moniter, mono moniter usually has terminator res on G only. This is done immediately after hardware reset i the PC. Your sony may have switchabke terminator res or may not have it at all.You could build a 15 pin plug w













ith terminator res, use that to power on and then switch the plug with the sony, or modify sony to include the res