Xref: utzoo rec.video:2725 comp.sys.ibm.pc:10504
Checksum: 44115
Path: utzoo!utgpu!tj
From: tj@gpu.utcs.toronto.edu (Terry Jones)
Date: Tue, 19-Jan-88 16:14:08 EST
Message-ID: <1988Jan19.161408.19676@gpu.utcs.toronto.edu>
Organization: University of Toronto Computing Services
Newsgroups: rec.video,comp.sys.ibm.pc
Subject: Re: CGA to Composite
References: <20857@yale-celray.yale.UUCP> <4923@well.UUCP> <2397@cup.portal.com> <694@bucket.UUCP>
Reply-To: tj@gpu.utcs.UUCP (Terry Jones)
Distribution: na

I hooked my clone up to a tv. It is ugly but fine for some games etc.
I used the RF modulator approach at first and had problems. No colour.
So I took my clone into worg and hooked up the RGB and got colour. Hooked
up the colour composite and got no colour!! It turned out that the
shop that had assembled the clone had not adjusted the motherboard clock
properly. The 3.579545MHz colour signal for the composite is derived from the
master clock and this needs to be adjusted properly. Hook up your machine
to a colour composite and adjust the trim cap near the crystal usually
located near the back of the machine. This is a very small value
trimmer capacitor and the capacitance of the screwdriver you use will
usually affect the adjustment. There are special trimmer adjusters for this.
They are totally plastic except for a tiny sliver of metal that fits in the
capacitor slot. real low capacitance. I used a regular screwdriver and all
you have to do is adjust it a bit then back away from it to see if you are
there. You can get the diagnostic disk to generate a colour bar or
else go into PROCOMM and use Alt-Z to set colours!!

Have fun.