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From: long@sask.UUCP (Warren Long)
Newsgroups: net.micro.atari16
Subject: Need help with standard RGB and 520 ST
Message-ID: <445@sask.UUCP>
Date: Sat, 27-Sep-86 01:10:30 EDT
Article-I.D.: sask.445
Posted: Sat Sep 27 01:10:30 1986
Date-Received: Tue, 30-Sep-86 08:19:13 EDT
Distribution: net
Organization: University of Saskatchewan, CANADA
Lines: 42


I know this may be old but...

I need help wiring a standard RGB monitor to my ST.  When all the
info passed thru the net regarding RGB problems, I was still 
waiting for my ST.  I now have it, and have consructed a little box
with a switch on it to select mono or colour.  As I should have
guessed from the flurry of comments 9 months ago about RGB, I 
should have anticipated a few more problems.  Basically everything
works well,  my little box turns the mono on/off and provides
composite video and audio.  

The problem:  the RGB output levels are analog 1 volt p-p.  It seems
	      that standard RGB monitors (mine included) require
	      ttl level signals.

My attempted solution:  I have tried breadboarding up an op-amp
	      circuit to convert the voltage levels to 0-5volts.  I
	      am now able to get blurry images on the RGB monitor.

My request:  - any circuit that will solve the problem.
	     - a definition of what exactly is 'TTL level' inputs
	       for an RGB monitor (obviously the brightness is in
	       analog form, which is not TTL (= ON/OFF) ).
	     - any other comments or ideas.

I am kind of enjoying solving the problem but it is a little awkward
when I don't really know what my goal is, other than a good picture.

Thanks a whole bunch,
	Warren Long


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Warren Long                            78 Carleton Dr.
University of Saskatchewan             Saskatoon
Canada                                 Saskatchewan,  S7H 3N6


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