Zypcom Z34-PC, User Manual

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Installation Problems
COM Port Address and IRQ Hardware Conflicts are
some of the most common installation problems. They
occur when more than one modem uses the same COM
port or IRQ. Additionally, other devices, such as the
mouse and sound card, may also use conflicting IRQs.
To check for a hardware conflict, you must first enter
DOS mode. Restart Windows 95 using the Restart to
DOS function in the Shut Down menu. Next, start any
DOS terminal emulation program such as PCPLUS. Try
sending AT commands to the modem.
COM Port or IRQ
Conflict
If you have a COM port conflict, you can try a different
COM port. Many computer systems come with either
one serial port and a modem or two serial ports that use
COM port 1 and COM port 2; therefore, it is best to try
COM port 3 and COM port 4.
If you believe an IRQ conflict may exist, go into the
Windows 95 Computer Properties screen and double
click the Systems icon at the top of the screen.
Windows 95 shows the IRQs being used by the system.
Scroll down the screen and find an IRQ not being used,
then try changing the modem board's IRQ to this
number. If the board does not support this IRQ, you
can change the IRQ number on another device and use
this IRQ for your modem. Alternately, you can free up
an IRQ by removing an existing board from the
computer and removing its name from the Computer
Properties screen.