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That is just running the TCP/IP layer speaking RS232 and relying on an external IC for lower layers. It's not at all what the GP is looking for.

It should probably also be noted that a minimum TCP header, with no data attached, is 20 bytes, so to implement a 'full stack' in 68 bytes is a pretty strong indication that you're relying on off SoC memory to handle the packet buffering.

I encourage you to read the source code instead of guessing how it may work.

Bet that handles TCP fragmentation well :)

Nice work though to whoever crammed that in a PIC.

Awesome. Can VirtualBox or VMWare run this?

From the first line of the source, it's a PIC (microcontroller) program, rather than something for x86 (which VirtualBox and friends emulate), so, no.

There are a few open source PIC simulators -- e.g. [1] -- and I would guess you might be able to get it running, since the link layer is SLIP over a serial port. You'd just have to wire up the simulator's serial console in the right way.

[1] http://gpsim.sourceforge.net/