Whats the difference between 2780 and 3780 emulation?
There were two distinct bisync RJE terminals made and sold by IBM. The Model 2780 terminal came first. The Model 3780 terminal was a later model and incorporated numerous improvements. The most notable of these improvements was a refinement of the bisync protocol. Functionally a 2780 and 3780 terminal did the same job, but the 3780 terminal was more dependable and more efficient. Most modern 3780 emulation packages support both the 2780 and 3780 variants of the bisync protocol, but the 3780 variant is used almost exclusively today.
