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unknown conflict between modem + sound c

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9 replies

by darryn_marr

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I have a user who is using a Dataflex PC Comms 1.4k modem,, and a CMI8330 on-board sound card. The motherboard is an American Megatrends P54C. The problem I'm having is that when both of these devices are acctive in the Bios, they cancel each other out in Windows 98. Neither of the devices are visible in the system panel. I've tried reserving irqs, dmas and memmory addresses to no effect. Each device works perfectly on it's own, and both are detected in the bios, which is plug-n-play 1.0A, but neither appears in the operating system. This problem has also occurred with the pci version of the sound card. Both modem annd sound card use ISA ports, even though the sound card is on board. I need both devices to work at the same time.

9 replies

by cosloot

Darryn is plug and play chosen in the bios setup? If it is diable it. While you in the bios setup up disable com2 if you are not using it. When you booting these devices on their own did each one go to the exact same system resources IE .. IRQ and input output addresses under properties of each item in System Resources? The 14.4 modem is probably not really as plug and play as you would like. Some times you can set jumpers on the modem to Com1 and Win98 will try to set it at Com3. disable Com2 to free up an IRQ. Jumper the modem to Com2, Boot up the computer with the Sound card enabled with the ISA modem out of the computer. Go into system resources and delete your modem driver. Reboot again and check you sound. If good Put in the modem card jumpered to IRQ2 and see what Win 98 wants to assign it for resources. This has worked for in the past most of the time. Make sure in the bios that Plug and play is disabled in that area where it say is OS plug and Plug. I don't enable Plug and play on any of my setups win95 98 NT or 2000. It is only a a tool but a nice tool when it works. hope that helps... email me if I can be of more help mschlueter@prolynx.com.

by clover252525

If the above solution doesn't work, try this: go into the CMOS setup at bootup (press DEL) and disable the sound card. Set up the modem first on COM2 (if Win98 doesn't detect the right modem but you have a disk, use the "Have disk" option) until it is registered in the Device Manager and has no conflicts. Then reboot and enable the sound card. Most sound cards hog IRQ-s meant for other resources and enabling them last (after everything else has an allocated IRQ) usually does the trick.

Clover

by pocono

Also, make sure your modem is using 2f8 as the address, and your soundcard should be on IRQ 5 :)

by hydroracer

seems to be a COM port conflict. both devices are vying for same resources. go into device manager and check properties for both. the thing to remember is that Com 1 & 3 are shared and Com 2 & 4 are shared. if modem is defaulted to com 1/3 and soundcard is too you have this kind of problem. shut down and change jumpers on 1 of the cards if available to one of the open com ports. then it should work. that P54c may be MFG'd by EFA Corp.

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