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From: csmith@plains.NoDak.edu (Carl Smith)
Newsgroups: rec.video,sci.electronics
Subject: Re: RGBS -> Y/C
Message-ID: <10737@plains.NoDak.edu>
Date: 6 Jun 91 19:51:49 GMT
References: <13965@pasteur.Berkeley.EDU> <1862@vidiot.UUCP> <1991Jun06.030022.28683@uhura.neoucom.EDU>
Organization: North Dakota State University, Fargo, ND
Lines: 37

In article <1991Jun06.030022.28683@uhura.neoucom.EDU> wtm@uhura.neoucom.EDU (Bill Mayhew) writes:
>Just a minor note.  The Mindset computer made a brief appearance on
>the market in approximately 1983.  The Mindset was largely an IBM
>XT clone, but had an NTSC compatible video output and offered
>genlocking and video attachments similar to the Amiga that followed
>several years later. 

The original Compaq Portable computers had a mutant video card that has
text modes similar to monochrome, with 9x14 pixel character cells and
720x348 screen resolution, but also supported the standard CGA modes.
The high res text modes worked only on the built in monitor, and when
the card went into the high res mode it shut off the external CGA outputs.
(Back in '82 there was no such thing as EGA cards, Hurcules cards, or
multisync monitors.)

The interesting thing is that it also has an NTSC output.  I can plug it 
into the video input of my VCR and use it for recording fancy titles before
my recordings.

The one thing that I didn't like is that when the card is in the high res
text modes that are incompatible with CGA, it simply shuts off the CGA and
NTSC outputs.   This causes my external CGA monitor to squeal due to the
lack of a sync signal.   It would have been better to output a video signal
with a "black" picture.   This would, of course, require more parts, and
up the cost. :)

-----------------------------
Carl D. Smith Jr.
csmith@plains.nodak.edu

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----------------------------- 
>-- 
>Bill Mayhew      NEOUCOM Computer Services Department
>Rootstown, OH  44272-9995  USA    phone: 216-325-2511
>wtm@uhura.neoucom.edu   ....!uunet!aablue!neoucom!wtm
>via internet: (140.220.001.001)