For those that might want to look at the roots, there are a few
references at the bottom of this page to IBM Bisync docs.
http://www.3780-emulation.com/3780-emulation-bisync-protocol.htm
The other publication which really contains the meat of Bisync is the
manual for the Data 100 2780/3780 workstation
I thought I ran across a PDF of the manual one time, but couldn't find
it looking just now. Here's what I could fine on Data 100.
http://www.cbi.umn.edu/resources/mncomphist-d.html
If we can scare up the docs, they go into adequate detail to make (or
debug) an RJE workstation
-ethan