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From: sgt@alice.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: RGBI Monitor
Message-ID: <7121@alice.UUCP>
Date: Wed, 22-Jul-87 23:52:20 EDT
Article-I.D.: alice.7121
Posted: Wed Jul 22 23:52:20 1987
Date-Received: Sat, 25-Jul-87 12:54:36 EDT
References: <614@madvax.UUCP>
Reply-To: sgt@alice.UUCP (Steve Tell)
Organization: AT&T Bell Laboratories, Murray Hill, NJ
Lines: 36
Keywords: C128 RGBI
Summary: qualified yes, best results need hardware hacking; other questions

In article <614@madvax.UUCP> richc@madvax.UUCP writes:
#	I have a friend with a commodore 1903 color monitor (the kind tha
#was made for the commodore 128).  It is RGBI.  Do you know whether or not
#it would work with an Amiga? ....
There are two ways to do this.
1) The easy way, with less than perfect results
The amiga has RGBI (ttl digital) outputs along with the other more commonly
used signals on its 23-pin video connector.
With the appropriate cable, this would work with your friends monitor.
HOWEVER.  He would be restricted to the same 16 colors as the c128 must have
been, or as a ibmpc was.
I don't know how these outputs are derived from the amiga's analog RGB
signals.  Can anyone enlighten us?  Does the hardware try to do the
best it can to approximate the colors specified in the lookup table?

2) the hard way, which requires hacking your monitor.
Modify the monitor for analog rgb input.
This requires that you know what you're doing, and can replace the
digital input section with a linear, analog one.
Anyone trying this had better know how to find out if the monitor has a
'hot' chassis, and design the appropriate isolation circuitry to avoid frying 
your amiga.

Another question:
My commodore 1080 (standard amiga) monitor has a switch for digital
input (RGBI) can someone tell me how to make a cable to use this monitor
as a pee-cee monitor?  I hate going back to pc's after my Amiga, but
color instead of green would make it a bit more pleasant.

#Rich Commins

Steve Tell
-- 
Steve Tell,  Student: Duke University
         Summer Employee: AT&T Bell Laboratories, Murray Hill, NJ  
Neither of these want anything to do with my opinions.