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From: olson@endor.harvard.edu (Eric Olson)
Newsgroups: comp.sys.mac
Subject: Re: NTSC from Mac II?
Message-ID: <2818@husc6.UUCP>
Date: Thu, 10-Sep-87 11:04:24 EDT
Article-I.D.: husc6.2818
Posted: Thu Sep 10 11:04:24 1987
Date-Received: Sat, 12-Sep-87 07:42:47 EDT
References: <4314@oberon.USC.EDU> <2801@husc6.UUCP> <1033@omepd>
Sender: news@husc6.UUCP
Reply-To: olson@endor.UUCP (Eric Olson)
Distribution: na
Organization: Aiken Computation Lab Harvard, Cambridge, MA
Lines: 25

In article <1033@omepd> patm@omepd.UUCP (Pat Mead) writes:
>At our last users group general meeting a local mac programmer hacked together
>an init that allowed the Mac II's video board output to go directly to a large
>screen (NTSC) TV. It was done in software!! I know since I helped him debug it
>in the first of the meeting. The output of graphics was ok but reading text was
>not very good at a distance. If there's a demand for this maybe I can talk him
>into posting it. When you use the init NO output will be seen on your mac 
>screen only on the NTSC monitor. Which means you must boot from elsewhere to
>remove the init to use your mac monitor again. It would be nice if you could
>use both at the same time.

OK, we now know that someone wrote an INIT to make the scan rate/interlace
correct, and someone else wrote a cdev to make it right while running (the
cdev's drawback was that you can't connect the video during boot, because it
will be set for the Mac II screen and might fry (?) the NTSC monitor).

What remains to be revealed is how to wire it up?  Where do I connect the
puppy?

-Eric




Eric K. Olson		olson@endor.harvard.edu		harvard!endor!olson