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A lot of confusion has been floating around regarding the 56K
modem on the I-Opener, hopefully this article can clear this up.
The I-Opener includes a 56k modem for connecting to the internet.
Despite the I-Opener's low cost, it is apparently NOT a Winmodem.
From codeman's dmesg output, it has a 16550
UART and occupies the standard com1 (There is also a com2, more on that
below). Many people have speculated that the modem daughtercard is
connected with an ISA or PCI bus, however this is not true. In the
picture to the [left or right, whichever side you put it on], you can see
a 16-pin connector. Most likely, 10 pins are used for the serial
connector, 2 pins for power, and 4 pins to connect to the phone jacks on
the rear of the unit. The daughtercard can probably be replaced with
another serial device once the connector pinout is determined. There also
might be a second serial port on the mainboard. The VIA chipset used
in the I-Opener has two onboard serial ports, and both show up under
linux.
There is a 10-pin header, like those used for serial ports, next to the
DIP switches and below the CPU. No one has confirmed (or denied)
this yet.
The Modem
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The DIP Switches:
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