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Path: utzoo!utgpu!utcsri!asm
From: asm@utcsri.UUCP
Newsgroups: comp.sys.atari.st
Subject: Re: Atari Show London (warning: long)
Message-ID: <4716@utcsri.UUCP>
Date: Fri, 1-May-87 10:06:05 EDT
Article-I.D.: utcsri.4716
Posted: Fri May  1 10:06:05 1987
Date-Received: Sat, 2-May-87 01:16:10 EDT
References: <984@ark.cs.vu.nl> <985@ark.cs.vu.nl> <987@ark.cs.vu.nl>
Reply-To: asm@utcsri.UUCP (Anees Munshi)
Organization: CSRI, University of Toronto
Lines: 29
Summary: 

In article <987@ark.cs.vu.nl> kleef@cs.vu.nl (Patrick van Kleef) writes:
>Sorry, forgot one or two things:
>
>* Some company has produced a small hardware interface for the Atari
>  ST that enables genlock-possibilities. Certain colors can be designated
>  to be used for another video-display. Thus you can have a 'live' video
>  picture of a group of people and animate all kinds of animals among them
>  from the computer. Useful for video-artists only, I believe.
>  BTW: A dutch company is daid to release a similar product for a price
>  of < $40.
>
>  [...]

	Should be quite easy to put a small hack together at home.
The ST monitor plug has an output called GPO (general purpose
output) which is driven by the sound-chip's parallel port or some such
thing and so produces a logic level signal. It should be possible to
use this output to switch the video signals.

	I haven't really tried this (I have only one monitor!) so I
don't know if the output works as the "ST Internals" book says. If
somebody should try this, I'm sure people on the net will be interested.

	anees munshi

ps. I don't recall offhand if there is a +5V supply available on the connector. 
    If it isn't, the hack may not be so direct (but there are many
    ways to get around this minor inconvenience).