Help!! Linux not detecting modem

I have a Motorola Lifestyle 28.8 internal modem set on Com1 in DOS.  But when Linux starts up I only see an entry for cua1 which should be my serial port(com2 in DOS) It also says that cua is a 16550A.  I have tried to dial out and get nothing.  Also in Minicom when I type atz or anything I get no response.  Please help.
davfaganAsked:
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pc012197Commented:
I suppose there is a conflict with your standard com1 port. The cleanest solution would be to set the modem to com3 (and a free IRQ - don't use the standard com3-IRQ!).

If this doesn't work try to boot without your modem card installed and look what happens. Does com1(cua0) appear?
Also look at the contents of /proc/ioports, /proc/interrupts and /proc/devices.

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