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SubjectRe: IDE-Driver Update :: Testing Requested (Ultra33 as RAID?? (fwd))
Martin Mares wrote:
> Hello,
> > I have one.
> >
> > The board uses a single PCI interrupt when in "native" mode,
> > and a pair of interrupts when in "compatibility" mode (IRQ14/15),
> > as do *all* compliant PCI IDE controllers.
> >
> > Note the confusion may simply be that a *single* "IDE controller"
> > these days always supports *two* hwif's (interfaces).
> >
> > The Promise RAID card is identical to the Promise Ultra33 IDE card,
> > except for a different on-board BIOS.
> I'm not sure about how does the IRQ compatibility mode work. The PCI bus
> itself has no chance how to transmit any IRQ different from the standard
> IRQ A/B/C/D pins. It must be either a planar device connected to non-PCI

IRQ compatibility usually is supported only on motherboard chipsets,
where all IRQ pins are available.

Some add-on cards support it through use of an ISA "header" which
plugs into an ISA slot via a ribbon cable from the PCI card.

Some PCI cards support it by using IRQA and IRQB, and having the motherboard
BIOS route IRQA to IRQ14 and IRQB to IRQ15.

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