   PCI and IRQs
  Hello!I figured someone here might know something about this.I am getting some crackling in my audio recordings with a Delta 1010 audio interface which is a PCI card with a breakout unit.So I emailed the company and they said to try getting the IRQ under 15 so it's not virtual.  My IRQ is at 20.  BUT I'm running in APCI mode, so there are actually 24 IRQs as I understand.  I moved the card to another PCI slot and the IRQ changed to 21.  I have many IRQs under 15 available so I'm not sure why this happened.  What can I do??   
  Jeez, IRQs.. haven't dealt with this in awhile.You should probably check your BIOS to see if you can manually force the IRQ. Device Manager can change some IRQs but probably not all.   ;  The only options I saw in my BIOS were to reserve the IRQ for legacy ASI (is that the acronym?? haha) devices or to set it for PCI devices.BTW, I own an Asus P5LD2 board.   ;  Ah, ISA. The bane of Intel. I think they've rolled all of ISA up into the Southbridge and are just waiting for an excuse to get rid of it.Anyway, does your card have some DIP switches on it? I've seen sound cards where you can change their IRQs manually.   ;  Damn.Last time I had a motherboard that had ISA slots (which I didn't use) was in 1998 on my Asus P5A.Sucker could overclock my AMD K6-2 300MHz to a sweet 345MHz by stepping up the bus to 115Mz. Using jumpers on the motherboard.Hooah, the times they are a changin'   ;  Man wtf haha.The card has no switches or doodads.  Just need it to get an IRQ assigned that is tied to the hardware!! Blasteddammitall!!!!It's mostly annoying cause I had this thing custom built by a shop made specifically for audio work, and that ONE THING won;t perform properly.  I can do anything else on it, but recording audio is botched.   ;  Hey, just a thought; does your motherboard have onboard audio?If so, did you disable it in the BIOS?If not, do it, because IIRC, the computer will not give a lone IRQ to your soundcard if the MB audio isn't disabled in the BIOS.   ;  Actually I JUST did that last night before I got to test my card again.Good call.So does anyone have any idea how to assign IRQs or 'help' the bios assign them.   ;  You might try adding /pcilock to your boot.ini file (assuming you are using an nt based windows os, like 2000 or xp).  It's supposed to stop Windows from dynamically assigning IRQs and lets the BIOS do the job.For more info Using BOOT.INI Startup Switches (Windows NT/2000/XP);  Is this safe?What happens differently if the BIOS does it?   