How to choose PCI Video card instead of integrated?

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How to choose PCI Video card instead of integrated?

Postby AlessandroB » 2019-11-26 @ 22:57

If i install my PCI graphic card in my PII, how to choose to use integrated S3 instead of ATI when i wanto to play dos games and choose PCI ATI when i go to windows98/XP? tnks
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Re: How to choose PCI Video card instead of integrated?

Postby dionb » 2019-11-26 @ 23:59

Integrated S3? Is it some kind of UniChrome chipset? If not, it's an onboard S3 chip, not an integrated device (no separate chip). That could be very relevant to your question. Which motherboard is it exactly?
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Re: How to choose PCI Video card instead of integrated?

Postby jtchip » 2019-11-27 @ 00:54

Depends on the motherboard and BIOS. On at least some Award BIOSes, under the "integrated peripherals" section there is a "init display first" option which allows you to select on-chip VGA, PCI slot or AGP slot. It could also be under "PNP and PCI setup" as "VGA BIOS sequence".
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Re: How to choose PCI Video card instead of integrated?

Postby AlessandroB » 2019-11-27 @ 06:58

dionb wrote:Integrated S3? Is it some kind of UniChrome chipset? If not, it's an onboard S3 chip, not an integrated device (no separate chip). That could be very relevant to your question. Which motherboard is it exactly?


ok, it’s an onboard s3 chip on a IBM 300GL PentiumII, Bios is really minimal, i control today.
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Re: How to choose PCI Video card instead of integrated?

Postby dionb » 2019-11-27 @ 11:05

Still need more info in the exact board - if it's an onboard AGP chip, you might be able to force PCI VGA vs AGP VGA, if it's onboard PCI that would be more difficult but there may be a jumper to select. Iirc most IBM systems from this period used Acer-manufactured boards.
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Re: How to choose PCI Video card instead of integrated?

Postby AlessandroB » 2019-12-01 @ 05:51

ok have success, the bios ibm of this machine is not so poor as I imagined. Just select in Device and I / O Ports -> Video Setup -> Primary Display and change between PCI or AGP. Strangely, from what I thought AGP enables the S3 onboard chip, with PCI, the ATI 9250 PCI video output is enabled.

Question: when I select AGP and get the video output from the S3, the ATI 9250 PCI card is not turned off right? Because in windows it appears anyway an inscription (now I don't remember which one) on the monitor connected to the ATI 9250. While in DOS the monitor connected to the 9250 goes on standby because it does not detect any video output.
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Re: How to choose PCI Video card instead of integrated?

Postby jtchip » 2019-12-03 @ 01:54

The BIOS setting determines the primary video device by initialising its video BIOS during POST. The secondary video device remains off until it's initialised in an OS with the correct driver, like Windows where you should be able to configure it for multi-monitor.
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Re: How to choose PCI Video card instead of integrated?

Postby chinny22 » 2019-12-03 @ 10:56

So as AGP enables the S3 this means you can think of it as and actual AGP card built into the motherboard like dionb said and not some cut down integrated chip like later systems.

And yes as you haven't disabled the video just selected the primary both will still be somewhat active. This is how you had duel screen back in the day.
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