At 6:26 PM +0200 5/2/02, mart wrote: >I've been studying these Mac, VGA, SoG, BNC pinouts and schematics for a >while, and I have one question: does Multiscan (only) use the 3 sense >pinnings to tell the computer what kind of monitor is attached or is there >more going on? Can it be that I heard something about I2C? > >If so, I can put together a configurable connector, with a table of >corresponding screen sizes. If not, it's not so simple as it looked :)
Apple dabbled with I2C a little on the S-Video In connector on the X100 Power Macs and perhaps some others too. The connection was there to support remote control of a video camera. I don't know if there was any actual use of it or not. The three sense pins on the Mac DA-15 video connector are the sole means of configuring the Mac for the monitor. The early video displays simply grounded one or more of the pins. Roughly starting with the MultiScan displays they started using the sense lines as select lines to increase the available codes. For some configurations you just tie two of the sense pins together, in other cases you need to connect them with a diode. -- Clark Martin Redwood City, CA, USA Macintosh / Internet Consulting [EMAIL PROTECTED] "I'm a designated driver on the Information Super Highway" -- Vintage Macs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac <http://lowendmac.com/lists/support.html> Vintage Macs list info: <http://lowendmac.com/lists/vintagemacs.shtml> The FAQ: <http://macfaq.org/> Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
