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