You realize the network card and the modem will conflict, and the computer will lock up. You buy a network card that comes out of the box with a default setting of IRQ 4. Installation Problems with COM PortsĪssume you have a modem set to COMl. Simply assign the device to the now-free port. By disabling one of these ports, you have made its address and IRQ available for use by the internal device. If necessary, these ports can be disabled (by using CMOS setup), freeing their I/O addresses and IRQs for another device.įor example, suppose you want to install a new internal modem on a machine that has two external serial ports on the motherboard. This makes it possible to install an external device simply by plugging in the port and assigning addresses to the device. In this case, the standard port addresses and IRQs are assigned to them. Most computers are manufactured to offer built-in physical ports with cable connections available either directly to the motherboard or in an expansion slot. The following table lists standard ports. When assigned to an active port (as long as no other device is using that port), they will work. Modems and printers, therefore, do not require IRQ or I/O settings. The purpose of a port is to make installation easier.
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