##I can use the motorola sm56 pci internal modem with win2000 driver provided by computer associations.
It was also shipped with the motorola pci modem.
It works well on Xp without disconnection, but problems on WinMe with frequently disconnection (also resolved)###
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For those with Motorola SM56 PCI, i have a solution that doesn't make the modem disconnect every time your hdd is overworking or whenever you run large programs. I had a serious problem in which every time I even put a cd on my cdrom, un archived a file, or played a game, i got disconnected. I couldn't work on my pc that way at all, therefore I've spent hundreds of hours searching in webpages for something that might help, like init strings or whatever.. none worked. Only what i did worked, and I hope this works out for other pci-based modems, too:
Go to control panel > system > device manager
> view devices by type > system devices
under that you should find "pci bus", double click on it, go to settings and choose
"use bios"
then go to irq steering and make sure to set it all like this:
(checked) use irq steering
(unchecked) get irq table using acpi bios
(checked) get irq table using ms specification table
(unchecked) get irq table from protected mode pcibios 2.1 call
(checked) get irq table from real mode pcibios 2.1 call
do the same in device manager > view devices by connection > system devices > pci bus
then click ok and restart your pc.