monitor resolution mac 9.2

July 15, 2010 at 05:45:39
Specs: Macintosh
I would like to add an extension to my monitor cable. Every time I try this, the resolution in the 9.2 partition sticks on 640x480 and it's not possible to select 'All' as opposed to 'Recommended'. I have rebuilt the desktop in 9.2, also in Classic, and also using Techtools. Techtools video tests all passed. As soon as I revert to the short cable the problem disappears. The monitor doesn't come with drives.

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July 16, 2010 at 17:59:51
Mac OS 9 detects what monitor is plugged in via the RGB cable(VGA). You'll notice that some Mac-to-VGA adapters use to have resolution switches hard wired on them. Depending on what wires are connected, and I'm guessing what resistance they offer will allow for different resolutions. Also the extension (driver) for your video card needs to be in the extension folder in order for Mac OS 9 to know what the video card is capable of displaying. I use to know the pinout of the RGB 2 row 15 pin connector by heart and use to build my own adapters, but were talking 10+ years ago. The best advise I can give would be to make sure you use a video cable with ALL 15 pins active and make sure each pin is routed to where it is supposed to go, ( Red to Red, HV to HV, etc)

Rebuilding the desktop, running video tests, etc. will do nothing for your issue.

PowerMac 9600(1 ghz G4)
512mb RAM
50gb SCSI
ATi 9200 PCI

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July 17, 2010 at 04:25:29
Thanks for that. The video card driver was in disabled extensions! (I have no idea why.) Obviously the 9.2 partition had somehow been able to pick up a default resolution from when I booted from an OSX partition, but only when using the short cable. So I never thought of a driver problem. Many thanks.

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