Anyone know of an internal modem that can share IRQs,
so that if you install more than one you still only use 1 IRQ line?
-Paul
Previously, Paul Russell wrote in qdn.public.qnx4:
Anyone know of an internal modem that can share IRQs,
so that if you install more than one you still only use 1 IRQ line?
Shouldn’t any PCI modem do this?
Mitchell Schoenbrun --------- maschoen@pobox.com
Most of the PCI Stuff I’ve tried is PnP, and each device grabs its own IRQ,
quickly using up the avilable list.
-Paul
Mitchell Schoenbrun <maschoen@pobox.com> wrote in message
news:Voyager.001018151517.32719A@schoenbrun.com…
Previously, Paul Russell wrote in qdn.public.qnx4:
Anyone know of an internal modem that can share IRQs,
so that if you install more than one you still only use 1 IRQ line?Shouldn’t any PCI modem do this?
Mitchell Schoenbrun --------- > maschoen@pobox.com
afaik no, at least ISA based modems.
“Paul Russell” <paul@jenosys.com> wrote in message
news:8sl2ko$126$1@inn.qnx.com…
Anyone know of an internal modem that can share IRQs,
so that if you install more than one you still only use 1 IRQ line?
-Paul
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Paul Russell <paul@jenosys.com> wrote in message
news:8sl8kq$7cq$1@inn.qnx.com…
Most of the PCI Stuff I’ve tried is PnP, and each device grabs its own
IRQ,
quickly using up the avilable list.
-Paul
I should hope that all the PCI stuff is PnP (since PCI has PnP sorta
“built right in”)! 
The behaviour of grabbing IRQs and “using up the available list” is not part
of how the hardware works (on the PCI device), but is determined by how the
PCI configuration software works (under QNX, it us usually the PCI Bios that
does this). It is also “normal” behaviour. Devices work (just a little
bit) more efficiently when they have their own IRQ, so the configuration
software will first give each device its own IRQ (if it can), and then when
“all available” IRQs are allocated, then it will start sharing the IRQs.
This is an oversimplification, of course, but gives some idea of why you are
seeing what you are seeing.
Mitchell Schoenbrun <> maschoen@pobox.com> > wrote in message
news:> Voyager.001018151517.32719A@schoenbrun.com> …
Previously, Paul Russell wrote in qdn.public.qnx4:
Anyone know of an internal modem that can share IRQs,
so that if you install more than one you still only use 1 IRQ line?Shouldn’t any PCI modem do this?
Mitchell Schoenbrun --------- > maschoen@pobox.com
\
Thankyou everyone for explaining PCI handling of IRQs - Always wondered
about some of the PnP parts of it…
-Paul