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NOTE: The 10pin header has been _verified_ to be Com2.
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
The DIP Switches:
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