| Title: | Microsoft Windows 95 ("Chicago") |
| Notice: | Please read topics 1 to 22 before writing anything |
| Moderator: | EEMELI::BACKSTROM |
| Created: | Mon Nov 14 1994 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 2958 |
| Total number of notes: | 19968 |
I have an Pentium 200MMX with a Intel motherboard using the latest BIOS etc. In this system I have a Adaptec 2940UW,a Matrox Mystique & a DE450 network card. The motherboard BIOS is setup to Windiws 95 as a P&P operating system and all works fine. I running OSR 2 of Windows 95. I've just found that the adaptec, mystique and de450 cards are all associated with IRQ 9 yet none say there is a conflict and they all appear to work without any problems at all. I also have a 'IRQ Holder for PCI steering' associated with IRQ 9 I was wondering if anyone could clarify why all three of these PCI cards report using IRQ 9 and do not say there is a conflict. Pete
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 2952.1 | TARKIN::LIN | Bill Lin | Tue Jun 03 1997 17:30 | 8 | |
re: WOTVAX::16.195.80.57::WorkBenchUser
There would only be an IRQ conflict if multiple edge-triggered
interrupt devices attempted to share an IRQ. If the devices all allow
sharing, namely they use level interrupts, then there is no conflict
and everything works.
/Bill
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| 2952.2 | BULEAN::BANKS | Goose Cooker | Tue Jun 03 1997 18:31 | 5 | |
Supposed to be one of the wonders of PCI.
One of the supposed non-wonders of PCI is that something (like the
BIOS?) will assign IRQs to PCI devices, even if they don't want or need
one... like a graphics card.
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| 2952.3 | IRQs and Matrox Mystique | OSEC::oloras7.olo.dec.com::GILBERT | Oh. | Tue Jun 03 1997 21:47 | 19 |
Re .-1: Bad example in this case, Mystique needs an interrupt if you enable bus mastering. Here's an extract from the README with the latest driver release: - Matrox Mystique Bus Mastering The Matrox Mystique supports bus mastering, which accelerates the 3D frame rate of Mystique bundled games and many Direct3D programs on the market. To access the bus mastering check box, click "PowerDesk" on the MGA Settings property sheet. Some early PCI systems may not properly assign an interrupt (IRQ) to your graphics card. If your graphics card doesn't have an IRQ, bus mastering can't be used. You can test for bus mastering support by running the MGA Diagnostic program, available in MGA PowerDesk folder. | |||||