This paper describes a sophisticated data communications controller, as cheap as possible, capable of taking all the required decisions to manage the SDLC protocol, in such a way that the SDLC problems are ignored by the host machine. In existing solutions, only front-end processors or very complex wired controllers can perform these functions for the classical disciplines.
/lp/association-for-computing-machinery/design-of-a-microprogrammed-controller-managing-the-sdlc-data-link-DJ0iul4KLE