Surface Pro (2017) vs Surface Pro 4
My system runs on Window Me
and I have a trouble with my internal
modem & CD Rom drive
*I see following IRQ assigned to
devices at startup.
Display Controller IRQ 11
IDE Controller IRQ 14
Serial Bus Controller IRQ 9
SMBus controller NA
Multimedia Device 5
Simple COMM controller 5
Please notice that simple comm controller
and multimedia device share the same IRQ. Is this okay?
Problem with modem:
I frequently get disconnected while online
& sys hangs.
I have to reboot to start working again and next time it
assigns following IRQ
Display Controller - 9 IDE Controller 14
Serial Bus Contrlr 5 SMBus NA
Multimedia Device 11 Unknown PCI device 11
Sys now fails to detect modem & it detects modem as PCI
device or EarlyVGA device. I don't see entry for Modem in
Device Manager. I see Other device with yellow mark.
I removed this entry, uninstalled driver from Add/Remove
and then reinstalled modem using New Hardware
Wizard. But it didn't work. I have to reinstall modem almost
I sometimes see double entry for modem as follow:
HSP56Micromodem and HSP56MicroModem#2
Modem Resorces as shown in Device Manager:
Interrupt request 05
I/O range C000-C03F
Use Automatic setting is checked
Modem Hardware version 002
com port 3
DOS Support :
COM port COM3
Base Address 3E8
(please note here it shows interrupt 4 instead of 5)
It says modem is configured correctly . But advice to
free this resource if wish to use modem with DOS application
as IRQ4 is used by another device.
Control Panel>Modem shows no modem
installed for com1 & com2
It shows HSP56Micromodem for COM3
*problem with CDRom
Sys reboots when I load CDRom drive with
CD.It happens with almost every CDs
Sys restarts followed by scandisc & if I don't remove
CD , it will shut down automatically. I have to wait
for few minutes before I can restart my PC
CD Rom drive is samsung sc-152c
Settings: Target ID, logical unit Number - 0
Firmware Version CS04
Disconnect & Auto insert Notification are selected
Syn Data transfer Not selected
Removable & Int 13 unit grayed out
Current Drive letter assignment G
Reserved Drive letter (strat & end) None
Driver:It says driver provider Microsoft. It also
says no driver file is required or have been loaded for this device.
Please notee that I see same IRQ setting 5 for Multimedia device & Simple
Comm Controller at startup. Can this be the main cause for my
problem with CDRom & Modem?
I thank you all for kind support
DeviceManager shows no conflict for modem or CD Rom
If you had a conflict, it would not work at all. you need to check your line
line faults wouldn't cause the CDrom to malfunction or IRQ conflicts,
The modem is a siftware modem, and contains it's own COM port - that's why it installs itself as Com3, rather than on the Com1 or Com2 which alraedy exist in your system. In itself it's excatly what to expect, and not a problem.
If you don't use the computers serial ports, you can disable them in the BIOS and it will free up the IRQs that they use - this may be helpful on older systems.
ashdavs advice about a different slot, setting the IRQ detection to Auto, - and also set the OS Plug and Play to Enabled, is an excellent thing to try.
PCI was designed for devices to share IRQ, however sometimes devices don't work well together and moving one of the cards to another PCI slot enables a different IRQ to be used / shared with another device and can solve conflicts.
Yes but you can only do that with a PCI modem. not a CNR or a AMR these have very short slot about 2" long
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