If you have an ISA PnP modem that can be manually assigned an IRQ and I/O port via jumpers, we recommend that you use the manual method rather than Plug-and-Play.

The devc-ser8250 driver should automatically detect the modem, which should appear in the /dev directory as serx, where x is an integer.

Note: There may be more than one entry in /dev under the name ser. Assume that the first two represent the comm ports of the system. Any additional entry is likely the modem. However, if in doubt, try all ser entries with qtalk. For more information, see "Testing Modems," below.

If the modem isn't detected, seek out the isapnp utility to configure the modem's I/O port and IRQ, and then specify them when you start devc-ser8250.

Note: If you start a serial driver for a UART or modem when another serial driver is already running, you need to use the -u option to give the new driver a number to append to the device name so that it doesn't conflict with any existing /dev/ser entry.