DUP11 Bit Synchronous Interface

This document is a user's manual for the DUP11 bit synchronous interface. It provides comprehensive information on: - General Description: Explains the role of the DUP11 in providing a data path between a synchronous modem and the Unibus, supporting protocols such as SDLC, ADCCP, and DDCMP. - Installation: Details unpacking, inspection, pre-installation setup (jumpers), address/vector selection, and power requirements. - Operating Features: Covers modem control, transmitter and receiver operation, including CRC generation/checking, flag/abort sequences, and maintenance modes. - Register Descriptions: Provides bit-level descriptions and diagrams for all DUP11 registers (RXCSR, RXDBUF, PARCSR, TXCSR, TXDBUF). - Appendix: Includes memory organization and addressing conventions for the PDP-11.