Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!samsung!think!snorkelwacker!mit-eddie!bu.edu!bass!ardai
From: ardai@bass.bu.edu (Michael Ardai)
Newsgroups: sci.electronics
Subject: Re: Composite Colour Signal (help my sanity)
Keywords: NTSC
Message-ID: <52494@bu.edu.bu.edu>
Date: 20 Feb 90 21:46:42 GMT
References: <507@ghp.UUCP>
Sender: news@bu.edu.bu.edu
Reply-To: ardai@bass.bu.edu (Michael Ardai)
Organization: Boston University
Lines: 22

In article <507@ghp.UUCP> jim@ghp.UUCP (Jim Stewart) writes:
>I have an old CGA that I am trying to get working with the composite
>input to my colour TV.
[Color screens show up as BW on the TV]
>-- 
>Jim Stewart, VE3SRJ
>UUCP:  jim%ghp@mnetor.uucp
>BELL:  (416)862-0430

I had this problem on an old clone.  In my case, the 14.xxx oscillator
on the motherboard was slightly off.  There may be a trimcap either
near the expansion connectors or the CPU that adjusts the frequency.
Run a color program on the PC and slowly turn the cap (in both
directions) until the color locks in.  Use a non-metallic screwdriver
since hand capacitance will de-tune the cap.
/mike



\|/ Michael L. Ardai ...!sun!teraida!maven.DECNET!ardai (preferred)
--- ----------------------------------------------------------------------------
/|\                      ardai@bu-pub.bu.edu