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Date:      Mon, 25 Jun 2001 23:09:25 -0400
From:      Bob Hall <rjhalljr@starpower.net>
To:        freebsd-questions@freebsd.org
Subject:   US Robotics modem
Message-ID:  <v04220800b75da2312c31@[66.44.71.193]>

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Hi,

I'm trying to configure a US Robotics PCI controller-based modem 
(model # 3CP5610A) to work with FreeBSD 4.3 (dual boot machine with 
Win95). Or I'm trying to configure FreeBSD to work with the modem. 
The modem insists on being installed on COM5 and assigns itself IRQ 
10. Somehow, in the process of trying to find a way to get the modem 
to use an IRQ associated with a more reasonable port, I switched it 
to IRQ 5, but I have no idea how. According to the online 
documentation at the US Robotics web site, the modem is supposed to 
allow itself to be assigned only IRQ 10. At any rate, when I assign 
the modem to COM1 and then reboot in FreeBSD, the OS finds the modem 
at sio0, and then moves sio0 to sio4. This happens with the modem 
using either IRQ 10 or 5. Currently the modem works in Windows on 
COM5 with IRQ 5.

Windows provides information only on COM1 and COM2, so I'm confused 
about COM3, 4, and 5. I also don't understand why the modem has to be 
installed on COM5 when 1 and 2 are unused. (The modem card has no 
jumpers.)

At this point, my best guess is to recompile the kernel with sio0, 
sio1, and sio4 enabled, and 2 and 3 disabled. (Both COM3 and 5 are 
currently using IRQ 5, and I think the same thing will happen with 
sio2 and sio4. I don't know how it works on Windows, but I gather 
from the documentaion that it won't work on FreeBSD.) If anyone 
reading this has ever successfully installed one of these modems and 
used them with FreeBSD, please let me know how you did it.

Bob Hall
Know thyself? Absurd direction!
Bubbles bear no introspection.     -Khushhal Khan Khatak
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