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Major Modem Problem ... please help!

Trish's Escape from Hardware Hell Help Board » Hardware » Networking, Modems and Connectivity » Major Modem Problem ... please help! « Previous Next »

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Posted on Sunday, June 3, 2001 - 11:42 am:   

I've been working on a neighbor's computer over the weekend, because he's been having major problems. I've just gone ahead and formatted and reinstalled Windows and all the software. The first problem is that this is a dinosaur machine - Pentium 120 with 48 MB RAM. Pretty old, but it seems to be working okay now; everything is working except the internal modem.

Here's the problem. It's an ISA internal 56k modem, so I put it in an ISA slot, and Plug & Play detected it on boot-up. I pointed to the drivers on the CD, and it installed no problems. I then tested it, and was surfing the Internet with no worries. However, when the computer gets restarted, it can't open the port and communicate with the modem anymore. Removing it from device manager and reinstalling it will work, except the problem gets repeated the next time the computer is restarted. I don't think my neighbor will appreciate having to remove and reinstall his modem with each boot-up!

So, a little about the settings here. It repeatedly installs the modem on COM port 2, with IRQ 11. However, in the device manager under COM Ports, it only has three listed - COM 1, COM 4, and the Parallel port. COM 2 is not listed here. When I select the modem from device manager, it says the device is working properly, and there are no conflicts anywhere.

If I go to modems from control panel, and select the modem, it can communicate to it from there if it was just installed. However, after the boot-up, it states that the COM port cannot be opened.

I've been spending countless hours on this thing, but I am clueless where to go from here. I've gone so far as removing every other device from the PCI and ISA slots, except the video card, and still have the problem. This computer has three other ISA slots, and I've tried moving the modem to each of them, with the same results. Has anybody else had this problem, or have any suggestions? It seems to me that if it's working, it should still be working after the computer is restarted. Not the case here. Please help me out, if you can!

>> After posting this, I got a response, and it said to get a new modem because it's taken a slight pop somehow. Well...the thing is, this is a brand new modem. His old modem got hit by lightning the other night, and this is a replacement. Not sure if the lightning could be impacting this one or not, because I have an ISA sound card in one of the slots that the modem wasn't working in, and it's working just fine right now. Suggestions?

V (Vera)
Posted on Monday, June 4, 2001 - 6:49 am:   

have you tried removing com 4 and installing com 2(in add new hardware) which uses irq3
I/O 02f8-02ff

i use isa modems and these are the settings that always work for me

does the modem have jumpers that you can set to com 2 irq 3

go into bios (don't know what bios you have there )
check around and see if there's a listing for "modem use irq" (mine is in POWER MANAGEMENT)tell it to use irq 3

IRQ 3 (com 2) : PRIMARY

resources controlled by : manual
irq 3 assigned to legacy isa

onboard serial port 1 : auto
onboard serial port 2 : disabled

diabling serial 2 allows the modem to use com 2

maybe this will be of some help
Posted on Wednesday, June 6, 2001 - 2:30 pm:   

I agree with Vera. You more than likely have an IRQ conflict. First, uninstall all of the com ports from device manager other than Com 1 (serial mouse). Then shut down and set the jumpers on your modem. Often on modern ISA modems, there is a jumper setting for "Plug and Play". I don't recommend using this. Instead, set the jumpers to Com 3 (I like 3 rather than 2 because it keeps me from getting the modem mixed up with the second onboard serial port), IRQ 3. Then restart, and disable Com 2 (also called "serial port 2")in your bios setup (because it also uses IRQ 3). In most cases, you won't have to set the IRQ 3 usage to manual, because your other devices will already have IRQ assignments, but it doesn't hurt to do it while you are in the bios setup. Reboot, and then run the add new hardware wizard. It should detect a com port at com 3 (your ISA modem). Then run the modems applet from control panel. It should detect the modem and query you for drivers.

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