It allows one to break the three serial connections from the Amtel chip to the serial ports of the SuperIO chip.
Specifically, the wiring is:
JP1 -- AM89C52 P3.2 (pin 9) to P11-3 (console RXD)
JP2 -- AM89C52 TXD (pin 7) to P10-3 (alt serial RXD)
JP3 -- AM89C52 RXD (pin 5) to P10-5 (alto serial TXD)
JP2 and JP3 carry the sreial communication between the AMTEL chip and the alternate serial port. This is
how we read the IR keyboard and remote codes. We don't know the exact details of the protocol, I captured
enough of it to be able to get things to sort of work. What the other serial connection over JP1 is
for is unknown. Since the AMTEL also hooks up to the smart card slot, one might expect it has to do with
this, although the smart card also requires you to send commands to it, so its not clear how exactly this would
work.
One could break these leads or pull out the AMTEL chip if one wanted to use the alternate serial lines for
some other purpose, like say controlling some other device. I haven't noticed any interference with the
console port (although both lines are probably driving this pin -- not good) unless I tried to use the IR keyboard and
then I couldn't figure out the data stream or if it was even a serial one. So, I'm at a loss as to the
meaning of the data going over the JP1 pin. I haven't tried breaking JP1 and seeing if the IR keyboard still works,
but that would be something to try if one wanted to run both the IR keyboard and run the other port as a standard serial
port via an adapter.
