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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!convex!darwin.sura.net!uvaarpa!murdoch!murdoch.acc.virginia.edu!heyes
- From: heyes@dadev.cebaf.gov (Graham Heyes)
- Subject: PC video to "video" video???
- Message-ID: <HEYES.92Sep9112234@dadev.cebaf.gov>
- Sender: usenet@murdoch.acc.Virginia.EDU
- Organization: Continuous Electron Beam Accelerator Facility
- Distribution: comp.sys.ibm.pc.hardware
- Date: Wed, 9 Sep 1992 16:22:34 GMT
- Lines: 24
-
- This is probably a stupid question but I'll try it on you.
-
- I want to duplicate the screen output of a PC on a normal
- television. (To get a big picture for use in a large hall).
-
- I have a sony with a coaxial input marked
- "video", does anyone know how to make a simple circuit to
- mix the sync and picture signals output from a PC into
- a composite video signal which the television would eat.
- I remember seeing something in a magazine a long time ago
- but can't remember the details. All I need is a simple
- black and white picture so at a guess I would mix the OR
- of the three colour signals with the horizontal and vertical
- syncs but I seem to remember that the picture signal is
- pulses made up of positive pulses while the syncs are
- negative. i.e. not your standard TTL, and I can't remember
- the voltage levels required.
-
- Any ideas diagrams etc welcome. Please reply by
- E-mail since I do not normally have anything to do with the
- PC world, someone suggested this as a last ditch attempt.
-
- Many thanks,
- Graham Heyes.
-