Can you force a dual-head card into mirrored-mode in DOS? \ VOGONS

Can you force a dual-head card into mirrored-mode in DOS?

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First post, by xjas

Posted on 2017-10-12, 22:54

xjas Offline

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As the title says. Specific card is a Quadro 2 (GeForce 2 GTS) with DVI & VGA. I'd like to mirror everything on one output to the other (text mode, VGA modes, VESA, etc.) in a pure DOS session without starting any GUI-type OS.

I don't suppose this is as simple as writing bytes to some register in assembly?

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Reply 1 of 2, by Jade Falcon

Posted on 2017-10-15, 03:14

Jade Falcon Offline

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I would think it would be less work to just get a vga splitter

Reply 2 of 2, by Malvineous

Posted on 2017-10-15, 05:51

Malvineous Offline

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Can you try a different card? Every multi-head card I've ever used defaults to mirrored mode on powerup if multiple monitors are connected. It's not until the OS drivers load that I can get different images on each monitor.

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