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From: rick@mips.UUCP (Rick Frazier)
Newsgroups: net.micro.6809,net.micro.amiga
Subject: Re: RGB Monitor Compatibility
Message-ID: <748@mips.UUCP>
Date: Wed, 29-Oct-86 11:43:12 EST
Article-I.D.: mips.748
Posted: Wed Oct 29 11:43:12 1986
Date-Received: Fri, 31-Oct-86 01:46:43 EST
References: <475@vaxb.calgary.UUCP> <1185@ihwpt.UUCP>
Organization: MIPS ... where RISC is a way of life
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Xref: mnetor net.micro.6809:568 net.micro.amiga:5539

> > has just been released by Radio Shack.  The CoCo III
> > uses an analog RGB monitor, just like the Amiga.
> > Well, not quite, the CoCo has separate RGB and sync
> > signals, whereas (if my info is correct) the Amiga
> > tacks sync onto the G (green) line.  Is this true?
> 
I don't believe that the amiga camps the sync on the Green line, and hauled out
the schematic package to check.  With all of the options the designers gave us
for outputs, it should be possible to hook up nearly any monitor, though many 
will obviously not be "up to amiga standards" of dot pitch, etc.

Looking at the schematic of the Amiga, the following signals are available
on the rear-panel d-connector that normally has the amiga monitor connected:

R, G, and B on pins 3, 4, and 5 (respectively)  These are the standard
	amiga outputs (analog rgb)

DR, DG, DB, and DI on pins 9, 8, 7, and 6 (respectively)  These appear to
	be "digital rgb and Intensity" outputs ala the ibm pc, but I haven't
	tried them as such yet.

QCSY* on pin 10, A composite sync.

HSY* on pin 11, a horizontal sync.

VSY* on pin 12, a vertical sync.

In addition, there is a composite video output on the backpanel (rca phono
	style jack) and the rf modulator output jack with another buffered
	output of the same composite signal plus left and right audio 
	channels.

Hope this helps out a bit.....

8-)                  8-)               8-)           8-)              8-)
By the way, there was a "discussion" about hooking up a monochrome monitor
	for those of the "amiga:vs:mac" wars.  I simply plugged a composite
	monitor into the rca jack composite out of the amiga, and there I
	was, "instant mac", same little 9 inch screen, monochrome image.
	no roll, horizontal tear, jitter or other hassles, just plug-n-play.
	Don't like the tall letters of the amiga on a 16" screen?????
	just plug in a 9" monochrome and see how the "resolution of the mac
	compares"			(-8        (-8       (-8        (-8


	


The schematic I am using for these signals is part of the schematics and
expansion specifications available from Commodore (don't have the address
any more, sorry)  
-- 
--Rick Frazier--  DISCLAIMER: The above is individual opinion (the result of my
imperfect recall of facts, real or imagined) in no way representing anyone else.
UUCP:  {decvax,ucbvax,ihnp4}!decwrl!mips!rick         DDD: 408-720-1700 x278