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O.T. 1394 IRQ
Thought I’d check with some of you guys and gals and see if you can think of something I’m missing. My editing machine has a Soyo Platinum II mobo with onboard 1394 which I used flawlessly until I installed a Canopus aceDVio card. I have since used the Canopus card for firewire connections, but my computer case has both 4 pin and 6 pin 1394 connectors (both worked until the Canopus card) right on the front of the case…very handy…and I’d like to be able to use those on the fly. The problem is…both 1394 devices (one VIA and one NEC) are using the same IRQ (19) as reported in device manager. I went into the bios and disabled Comm 2 which uses IRQ3 thinking that it would free up the IRQ so one of the 1394 devices could use it. But upon reboot, they both still are trying to use IRQ 19 and the “use default settings” check box is grayed out so I can not change the IRQ of one of the devices.
Can anyone think of a way I can get one of these 1394 devices to use a different IRQ. It’s not a huge problem, but I would like to have the extra 1394 ports available if possible.
Thanks,
Ted -
6 Replies
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IRQ is a hardware interrupt. The only way you can get two different IRQ’s for your firewire devices is with two Firewire cards. Since the majority of us don’t run more than one Firewire card, whatever you are trying to solve isn’t a widespread problem.
Steve
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IRQ19 is usually the ACPI resource controller that gloops all the actual IRQs of peripherals (the PIRQ lines) and pumps them into the OS using an additional layer. Doesn’t mean that you won’t find some benefit in verifying that you have the right kit in the right slots, that is something you’ll tell using the IRQs that you see on the BIOS boot screen where you see all that guff about multimedia controllers and PCI vendor IDs etc.
Windows doesn’t inherently have a hangup on IRQs. Some device drivers are fussy, but essentially you are matching your peripheral hardware and support software into the grander scheme of things. Sometimes this feels like art, sometimes it is like science, but sure as anything – it is a pain to get right if it doesn’t just go the right way. The manual usually gives clues about shared resources, IRQ and bus mastering signals. You’ll see mention on overlaps between slots and onboard peripherals like NICs and Sound devices. Usually the slot next to the graphics card is a bad place for AV or network stuff. Fortunately we shed a lot of this nonesense by using motherboards with everything integrated or the newer PCIExpress bus interconnect. Not all of us have made the jump there quite yet though.
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[Richard Bartlett] “IRQ19 is usually the ACPI resource controller that gloops all the actual IRQs of peripherals (the PIRQ lines) and pumps them into the OS using an additional layer.”
Is it common then that device manager would show both 1394 devices as using IRQ 19? As I stated, it’s not a real problem…but having the two extra ports on the front of the case would be handy instead of having to reach behind the case to access the port on the aceDVio card. On occassion I need to dump the timeline directly to my stand alone DVD recorder for a proofing for a client instead of having to render the project first. I find this easier than using “print to tape” since I can run the timeline in “preview best” mode and not have to pre-render anything. Thanks for the responses.
Ted -
[Steve Mann] “The only way you can get two different IRQ’s for your firewire devices is with two Firewire cards.”
I would think that this would be the same as two firewire cards. One just happens to be integrated into the mobo.
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I don’t have any firewire ports on the front of my machine since I took out the DV Storm bay…so what I do is keep a Firewire cable permanently attached to the rear port, but led out front for easy attachment to the camera/deck/whatever.
Regards,
Doug Graham -
Doug,
I too have a cable ran from the back of the computer that I can switch to different pieces of gear…but 4 pin firewire ports are not that durable to say the least especially when you have to plug and unplug. I had a pin bend on me on my old TRV350 camera which made the camera useless for firewire transfers. I now have a VX2100 that I am much more delicate with the firewire port. Quite a bit of my business is old 8mm film transfers so when I’m not shooting with the VX2100 I leave it set up for transfers so there’s less plugging and unplugging. I’ll keep tinkering and see if I can come up with a solution to the IRQ problem. Thanks again.
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