Thanks to Ray and Tom for their advice. I now have the new modem up and
running on /dev/ttyS1 (which is linked to /dev/modem). As it turned out,
and what Tom brought my attention to, attaching the modem to both ports
was shorting the signals.
On 4/2/99 03:26, Ray Olszewski at [EMAIL PROTECTED] wrote:
[snip]
>
>Second, regardless of where you've been trying to attach the external modem,
>you want it on /dev/ttyS0 . S1 and S3 share an interrupt, and you don't want
>the added complication of dealing with that.
>
Reading through the Serial How-To, I see here that ttyS0 and ttyS2 share
one IRQ and ttyS1 and ttyS3 share another. So, I guess that would be a
problem if I were trying to use both modems siimultaneously (which, it
now occurs to me, I was last night - trying to set up the new modem while
downloading the latest kernel sources).
>Third, the best app to use to look for a modem is minicom. It uses the
>symlink /dev/modem, so set that up with the line "ln -s /dev/ttyS0
>/dev/modem". Then using minicom, try to send an AT sequence to your modem
>(any you know will do; AT&V (view active configuration) is a safe one to
>try). Do this with the modem attached to each of the serial ports in turn
>(one at a time, that is, not both at once), and you should find out which
>is S0.
>
My reason for choosing kermit was that it is the communications tool used
in the Serial How-To. I did try minicom briefly, but it wasn't
immediately apparent to me how to speak to ttySx directly. So, I went
and got kermit.
>Finally, there may be an IRQ problem, depending on where your mouse and (if
>you have one) NIC are located. Check "more /proc/interrupts" to make sure
>IRQ 4 (S0) and 3 (S1) are either unused or assigned to the serial ports. If
>IRQ 4 is being used by something else (rare in my experience) then that is
>blocking access to the serial port and hence to the modem.
>
I need to write that "/proc/interupts" on a yellow sticky and put it
somewhere in ready view. I have had reason to look at my IRQs several
times lately, and I keep forgetting how to do it.
Thanks and regards,
Sean
T. Sean (Theo) Schulze
[EMAIL PROTECTED] [EMAIL PROTECTED]
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