Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!uakari.primate.wisc.edu!ra!tag1 From: tag1@ra.MsState.Edu (Timothy A. Griffin) Newsgroups: comp.sys.mac.hardware Subject: Re: LC VIDEO OUTPUTS Message-ID: Date: 3 Jun 91 14:11:28 GMT References: <14825.2845F481@fidogate.FIDONET.ORG> Lines: 47 Douglas.Currens@f444.n161.z1.FIDONET.ORG (Douglas Currens) writes: >Can anyone tell me the pinouts and which sensing lines are grounded for each >video mode on the LC? I'd like to share SVGA monitors with my PC, and perhaps >even change emulations from time to time (Hi-res 256 color vs. Lo-res 32,000 >color!). I've got a MAG Computronic monitor, if it matters, and rumor has it >from James Engineering, which makes a VGA/LC adaptor, that the LC video >output is too low to drive many monitors. Any feedback? Paul Wenker from Apple posted the following pinout: LC Pin VGA Pin Signal name ------ ------- ----------- 1 6 Red ground 2 1 Red video signal 5 2 Green video signal 6 7 Green ground 9 3 Blue video signal 13 8 Blue ground 15 13 /HSYNC 12 14 /VSYNC 14 10 HSYNC ground 7, 10 nc SENSE1 & SENSE2 tied together The LC supports 640x480x16 on a VGA monitor, or 640x480x256 if you have 512k VRAM. NOTE: The Tech Note warns that some low impedence VGA monitors will not work with the Mac LC. I built an adapter using this pinout, and it works great with my LC. I have used it successfully with an NEC Multisync GS2A and with a Seiko CM1440. There have been several threads on the net recently wherein people have warned that Wenker's caveat about low-impedance VGA monitors is definitely true. It seems that any "good" VGA monitor is supposed to work well. James Engineering does offer a ready-made adapter for about $40 (US) and the Berkeley Mac Users Group offers a kit for about $15 (US). -- .. Timothy A. Griffin | Opinions expressed here are .. .. MSU Computing Center | mine and mine alone. Any .. .. Internet: tag1@cc.msstate.edu | similarity between them and .. .. Bitnet: tag1@MSSTATE | intelligence is purely .. .. Phone: (601) 325-3112 | coincidental. .. ...........................................................................