The Psion Link Protocol (for Psion 3, aka SIBO)
The information provided here is outdated, because better and more accurate
information especially for EPOC is available. But nevertheless it was
the thing that started the ball rolling.
I actually guessed most of the protocol out of two hex dumps...
Sample 1 and Sample 2.
More detailled and accurate information and implementations can be found at:
Michael Pieper at Palmbeach: BeOS driver
Phil Proudman created a Linux program "plp" first. Web pages now defunct.
Matt Gumbley had an alternative approach for Linux. Web pages now defunct.
My favourite implementation was Fritz
Elfert´s plpnfsd. A Linux/Unix NFS Server/Client borrowed
from p3nfsd and Phil Proudman´s plp. Now known as the plptools.
Alexander Thoukydides has written an excellent documentation and an
implementation "PsiFS" for Risc OS. The documentation is now found at
sourceforge in the plptools