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- Path: sparky!uunet!usc!elroy.jpl.nasa.gov!swrinde!ringer!ricky.brainlab.utsa.edu!senseman
- From: senseman@ricky.brainlab.utsa.edu (David M. Senseman)
- Newsgroups: comp.sys.sgi
- Subject: Re: Videos from the screen?
- Message-ID: <1992Aug18.024211.28165@ringer.cs.utsa.edu>
- Date: 18 Aug 92 02:42:11 GMT
- References: <23317@oasys.dt.navy.mil> <odaj97c@fido.asd.sgi.com> <1992Aug17.223534.4239@imax.imax.com>
- Sender: news@ringer.cs.utsa.edu
- Distribution: na
- Organization: University of Texas at San Antonio
- Lines: 55
- Nntp-Posting-Host: ricky.ls.utsa.edu
-
- In article <1992Aug17.223534.4239@imax.imax.com> dave@imax.imax.com (Dave Martindale) writes:
- >
- >I tried "setmon ntsc" on my XS24 and looked at the video output on an
- >oscilloscope. It sure looked like properly-timed NTSC, within the
- >measurement accuracy of the 'scope. All three of RGB have embedded sync.
- >So it *looks* like you could connect this directly to a video recorder
- >with RGB inputs, such as the Sony LVR-5000 or LVR-3000 write-once videodisc.
- >Has anyone actually tried this?
- >
- >A smaller issue: Does anyone know of a source of reasonably-priced
- >video cables to do this? They'd need a 13W3 connector on one end
- >and BNC RGB connectors on the other end. And how should the other
- >pins on the 13W3 be connected when there isn't a monitor on the far end?
- >
-
- Funny you ask this -- I was on the phone today with SGI Express about this
- very issue. SGI does make a cable that is a "13W3-to-BNC" (Part number
- 0188105001). I think the cost is about $100 (but don't quote me :)
-
- The small pins are used to code for the monitor type. They form a
- passive circuit so they don't have to be connected BUT if they
- aren't connected, the Indigo defaults to the 19 inch Hitachi.
- If you have a smaller SONY monitor (like us) this is not good :-(
- Someone from SGI correct me if I'm wrong, but I think I was told that
- you CAN'T set the monitor type in software. (Doesn't sound right but
- that's what I'm told).
-
- One idea we had was to buy two of these 13W3-to-BNC cables and use
- 3 BNC "T" connectors to split-off the RGB signals into a CHEAP
- encoder box we are building using the new Motorola MC13077 encoder chip.
- However $200 just for cables seems a bit much since we only plan to
- spend $30 - $50 dollars for the whole encoder box.
-
- A better idea would be to buy two (2) panel mount female AMP 13W3 connectors
- and wire them pin-for-pin and run your existing SGI monitor cable from
- the Indigo into one connector and a home-made cable from the second
- connector to the monitor (i.e. you buy 2 male and 2 female connectors
- from AMP). Now, you can easily pick off the RGB signals and run them
- through some Radio Shack video ampfilers (to avoid signal degradation)
- on their way to the MC13077 encoder chip. Buy a small power supply,
- a couple of resistors, a switch, etc. and your making videos!
-
- I haven't received the Spec's on the MC13077 but I think it supports
- S-VHS as well as VHS.
-
- We are still in the design stage of our CHEAP ELAN VIDEO OPTION and
- would welcome any comments and/or suggestions. We will post the
- success (or failure) of our project if anyone shows the slightest
- interest.
-
-
- --
- David M. Senseman (senseman@lonestar.utsa.edu)
- Division of Life Sciences
- The University of Texas at San Antonio
-