what serial port are you trying to detect it with and what dialout program are you using, like kppp or redhat dialer? well an external modem connected should usually be com1 or com2... so you should try to query for it on ttyS0 or ttyS1 depending on how you have it connected? also if it still doesn't detect it, try using setserial command to manually tell its location. you shouldn't have to worry about an irq conflict since most serial ports are already assigned one.
let us know!
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