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Article #13951

IBM CGA composite output

#13951
From: gregory.l.allen
Date: Wed, 24 Apr 1991 23:29
21 lines
1731 bytes
My father has an AT&T 6300.  He has disabled the indigenous video card and has
used other CGA video cards successfully.  I recently acquired a true Blue
original IBM CGA card (full-card) because it is the only source of <<color>>
composite output that we could find for a reasonable price.  However, when
we use the composite output to his Magnavox RGB monitor, we get only black &
white output.  The monitor works fine with a different 9-pin CGA card.
A technician in California suggested that the "colorburst
frequency" needed to be adjusted on the "motherboard" to adjust the setup
to give color.

I have two questions that someone may be able to help us with:
1) is there anything else that needs to be done to use an IBM CGA card in a
        6300 (do we need a bus corrector, etc.?)
2) I thought the colorburst frequency would be generated by a crystal.  Can
        this be adjusted, and if so, how and where?

We need color composite output to generate a TV signal for a VCR.  We are
making titles for home videotapes.  If anyone has suggestions on doing this
we would also be grateful.  Thanks for any and all information.

Greg Allen      gla@moss.emsp.att.com        WH 2a-110       (201)386-7404
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From: gla@cbnewsj.cb.att.com (gregory.l.allen)
Newsgroups: comp.sys.ibm.pc,comp.sys.ibm.pc.hardware
Subject: IBM CGA composite output
Keywords: IBM CGA, composite, PC6300
Message-ID: <1991Apr24.232935.7148@cbnewsj.att.com>
Date: 24 Apr 91 23:29:35 GMT
Sender: gla@cbnewsj.att.com (gregory.l.allen)
Distribution: usa
Organization: AT&T Bell Laboratories
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