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PCI seriall I/O cards and MS-DOS (!)

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Old 12 November 2005, 08:58 PM
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Fuchsrohre
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Default PCI seriall I/O cards and MS-DOS (!)

We have an old legacy application running on MS-DOS which accesses COM1 and COM2 through the traditional IRQ and I/O addresses.

The computer it was running on needs to be binned.

The new computer has a COM1 but no COM2. I've found a PCI card that, once installed, will play the role of COM2

My question is, will this card offer itself to MS-DOS as a COM port ? (or does it need a Windows OS to function)
Old 13 November 2005, 04:05 PM
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jpor
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Originally Posted by Fuchsrohre
We have an old legacy application running on MS-DOS which accesses COM1 and COM2 through the traditional IRQ and I/O addresses.

The computer it was running on needs to be binned.

The new computer has a COM1 but no COM2. I've found a PCI card that, once installed, will play the role of COM2

My question is, will this card offer itself to MS-DOS as a COM port ? (or does it need a Windows OS to function)
You may need to set something up in your config.sys and/or autoexec.bat at boot up to point to a DOS driver to get it to work properly. Not much DOS supported drivers these days. Or if your BIOS has something set-up for IRQ & Port assignments on PCI cards it may be worth setting these.
I take it you don't have a com 2 header on your motherboard which you can plug in a comm cable into? If so then it just needs activating in your BIOS and DOS will see this as a default. Com port settings should be set-up as:

3f8 IRQ 4 (Com1)
2f8 IRQ 3 (Com 2)
Old 13 November 2005, 07:22 PM
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Fuchsrohre
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no headers on the motherboard or else things would be much easier!

I'll check when I buy the PCI card to see if its DOS compatible. I thought maybe's the BIOS might pick up the PCI card as the new com2, and subsequently DOS would see it.

If not, I'll install the PCI card into Win9x, then run the DOS app through windows.
Old 13 November 2005, 09:43 PM
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jpor
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Originally Posted by Fuchsrohre
If not, I'll install the PCI card into Win9x, then run the DOS app through windows.
Ummm... It may still not see it then, as you will be using Windows drivers, and will not be set-up via DOS.
Give it a go.
Old 13 November 2005, 10:02 PM
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jpor, so going back to the DOS question.

Once instaleld , won't PCI card simply act as if it was a COM2.

eg. won't it just steel IRQ3 and $2F8 and effectively be COM2 ?
Old 13 November 2005, 10:07 PM
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Originally Posted by Fuchsrohre
jpor, so going back to the DOS question.

Once instaleld , won't PCI card simply act as if it was a COM2.

eg. won't it just steel IRQ3 and $2F8 and effectively be COM2 ?
No. Not neccessarily, as it is plug and play and thus theorecitcally could take up COM5 on a different IRQ and I/O port number (It's a bit like russian roulette when it comes to getting the correct IRQ and I/O). I have seen this on many occasion. You could try reserving an IRQ and I/O in the BIOS against a PCI slot. And try that. Make sure that COM2 is disabled in the BIOS also.
Old 13 November 2005, 10:23 PM
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ok, thanks
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