Did you setserial the com port, irq, and ioports?  If so, then you just have 
to keep trying the different configurations until you hit upon the right 
combo.  It can take time.  BTW, if your sound card is also isa, you can use 
sndconfig to set up your isapnp.conf, and then just setserial the port and 
irq it sets up for the modem in that file.  (Easier).  
-s

On Sunday 14 January 2001 09:25 am, you wrote:
> Hi all,
>
> My BIOS is set to non-PnP. My ISA (real) modem can be
> jumpered to a specific IRQ, or to PnP. It's currently set to
> PnP, which works fine in Win98. Linux is a different story.
>
> Here's what I've done so far: I used pnpdump to get possible
> settings, and after verifying at /proc/interrupts that it
> was free, I chose IRQ 4 for /etc/isapnp.conf file.
> (Incidentally, pnpdump gave me two choices for this
> particular setting: one in which you choose the io address,
> and the other where you choose the IRQ. Only the IRQ choice
> worked.) I then ran "isapnp /etc/iaspnp.conf", and Linux
> reported that life was good.
>
> But when I try to connect to the Internet in KDE, I'm told
> that the modem "won't respond" to either /dev/ttyS0 or to
> /dev/modem (which would be the same, thanks to modemtool).
> If I try ttyS1 or anything else, I'm told that the device is
> "busy", so it knows something is different about ttyS0.
>
> I've been reading and working through this problem for
> almost 4 hours, and I've about given up. What do I do from
> here?
>
> Miark

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