Path: utzoo!utgpu!water!watmath!clyde!rutgers!mailrus!nrl-cmf!cmcl2!brl-adm!umd5!uvaarpa!mcnc!ece-csc!ncrcae!ncr-sd!hp-sdd!ucsdhub!esosun!seismo!uunet!mcvax!unido!tub!tmpmbx!netmbx!hase From: hase@netmbx.UUCP (Hartmut Semken) Newsgroups: comp.sys.atari.st Subject: Re: 1040 to TV/VCR Message-ID: <1292@netmbx.UUCP> Date: 10 Feb 88 16:38:38 GMT References: <880204-065400-4005@Xerox> Reply-To: hase@netmbx.UUCP (Hartmut Semken) Organization: netmbx Public Access Unix, Berlin Lines: 37 Posted: Wed Feb 10 17:38:38 1988 In article <880204-065400-4005@Xerox> brantly.henr@XEROX.COM writes: >>The $100 plus price tag for a RGB to composite cable seems a little steep. >>Elektor magazine (it from the UK) published a circuit to do this called >>Atari ST to SCART adaptor in early 87 (march I think). SCART is an >>analog RGB interface with composite sync - I think this should do what you >>need. Parts cost is under $20.00 > >------------- > >The Atari ST to SCART adaptor sounds interesting, but would it provide BOTH rf & Ther is a great difference in the technique: The Euro-AV (SCART) includes extra lines for almost evey signal a TV can handle: one for each:red, green, blue, horizontal-sync, vertical-sync, composite-sync, composite video and so on. Composite video (or FBAS in Germany) contains the complete picture on a single line: it is the signal the modulator will put on top of the RF and make it look like coming from an antenna. The ST has outputs for RGB and composite-sync (sync not video!). The RGB-compVid-Converter will have to put this information on a sigle line, whitch is a tricky task. But the Motorola MC1377-chip (you will find one opening your video camera or Amiga) solves this problem. Here in Germany a Magazine (c't) published a board containig this chip and a little more (resistors, capacitators) to get composite video. A simple solution ist mixing RGB and compSync together by a resistor network: connect 300 Ohms to each, red green and blue, 50 Ohms to composite sync and solder the open ends together; what you will get is an grey-scale video signal of the medium or low resolution; I am using this to display all the colour-games on a green monitor. Not the solution but cheap... hase -- Hartmut Semken, Berlin (West) (*east of West-Germany :-) hase@netmbx.UUCP answer: 42 question: under development. Stay tuned.