"Jason K. Fritcher" wrote:
> The ISA bus is typically chained to the end of the PCI bus with a PCI->ISA
> bridge. Basically the ISA bus appears as just another device to the PCI bus.
> Anything that consumes all of the PCI buses bandwidth for a long period of
> time, or anything device that stays in its IRQ handler for too long will
> disrupt communication on the bus.
>
> The AGP bus is typically runs parallel to the PCI bus, so they don't affect
> each other.
Dont count on it :(
> Anything that is labelled as a "Winmodem" or compatible with only MS
> Windows.
winmodems cover both software (the bad ones) and controlerless ones (the
ok ones)
the Lucent winmodem is pretty darn good, I actually have less cpu
utilization with that then my old external, and it never disconnects.
The conexiont soft 56 flex, or the HSP chipped modems are the ones to
avoid.
> Only the winmodem will suffer from bus disruptions. The modem now relies on
> the system's cpu to generate the carrier signal that keeps the modems
> connected. If a bus disruption occurs, thay carrier gets disrupted and the
> modems disconnect.
Basically in a software modem, the modem signal is made by the software,
and carried over the bus just like audio, so anything that messes up
your sound will mess up the modem signal. The remote modem will hear the
jumpy sound as noise and most likly disconnect because of it.
controlerless modems (conexiant HCF and LT winmodems) carry data over
the bus, but its the raw data thats getting sent along with instructions
for the DSP on what to do. Hardware modems send the instructions and
data as one stream like it was going to a serial port - this is less
efficiant, and means that while you are online you cannot send commands
to the modem.
Some drivers for the controlerless ones will let you see line conditions
and speeds etc while you are connected, whereas the hardware ones make
you wait till you are disconnected to see why.
> With a normal modem, all of the signal processing and carrier generation is
> done on the modem itself and all the system cpu has to do is send the modem
> the data to transfer. If a bus disruption occurs, the modems stay connected,
> but stop transmitting or receiving data.
Generally they will have a comm overrun where the computer misses out on
data, PPP will take care of that and request a retransmition.
but in any case, if the sound is disrupted when scrolling, then its a
video driver issue and you should not let up untill your card vendor
admits there problem.
--
Richard
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