DMR11 Synchronous Controller

This manual, titled the DMR11 Synchronous Controller User's Guide, serves as the primary technical documentation for the installation, programming, and operation of the DMR11 synchronous controller. It details how the DMR11, a microprocessor-based intelligent communications controller, enables high-performance interconnection for VAX and PDP-11 systems using the DIGITAL Data Communications Message Protocol (DDCMP). The guide covers:

• Installation: Procedures for setup, system placement, microprocessor (M8207) and line unit (M8203) installation, cabling, and diagnostic testing.
• Programming: An overview of the UNIBUS control and status registers (CSRs), command structures (including input and output commands), and techniques for initializing and operating the DMR11 under DDCMP.
• Maintenance and Troubleshooting: Details on maintenance mode, modem control, and base table error counters for system diagnostics.
• Appendices: Additional reference material including floating device addresses, vectors, a summary of the DDCMP protocol, and the diagnostic supervisor.