DU11 Single Line Programmable Synchronous Interface

The DU11 is a program-controlled, single-line, double-buffered communication interface for the PDP-11 family of computers. This manual covers the interface's data communication techniques, physical and general descriptions, specifications, installation procedures (including standard and current mode configurations), and register-level programming requirements for synchronous and isochronous modes. The document includes detailed register bit assignments, interrupt request handling, and technical information for interfacing with various modems.