Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!swrinde!cs.utexas.edu!uwm.edu!linac!att!ucbvax!IFI.UIO.NO!larserio From: larserio@IFI.UIO.NO (LarsErikOsterud) Newsgroups: comp.sys.atari.st Subject: ST and Multisync Message-ID: Date: 21 Jun 91 12:51:45 GMT Sender: daemon@ucbvax.BERKELEY.EDU Reply-To: larserio@ifi.uio.no Lines: 47 Multisync monitor switchbox and cabel (this is tested and works) """""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""" If you want monochrome your monitor must handle 71 Hz frequency NOT all monitors do this - To be sure - Test before you buy it! Multisync side (no pin number - they depend on your monitor outlet) Red Green Blue HorSync VertSync Ground | | | | | | | | | | | | SW1---SW2---SW3-------. | | |---SW4---. | | | | | | | | | | | | | | | | Red Green Blue Monochrome HorSync VertSync Ground MonoDetect 7 6 10 11 9 12 13 4 Atari ST, STE or MEGA STE side (number as in operating manual) The switch you need must be of the type with 4 pins in that can be switched between 2 x 4 pins out (two choices) and works like this: Switches 1,2,3: When in color red, green and blue passes straight --------------- through without contact with each other or mono. When in monochrome they are all disconnected from ST RGB and instead all connected to ST monochrome -------- ST RGB (in color mode) Monitor --------- SW -------- ST Mono (in mono mode) Switch 4: Open in color, monochrome detect not connected. --------- When in monochrome monochrome detect is connected to ground (this tells the ST it's in monochrome). Monitor GND --------------- ST GND (always connected) SW ------ ST Mono Detect (in mono) Don't worry, the worst bit isn't making this - it's getting the 13-pin Atari monitor connector for the ST side and solder it !! Lars-Erik / ABK-BBS +47 2132659 / ____ ______ ________________________ Osterud / larserio@ifi.uio.no / /___ / The norwegian ST __________/ ______________________/ ____/ / Klubben, user association