Serial Line Unit / Real-Time Clock Option

This technical manual provides comprehensive information for the installation, configuration, programming, and operation of the DL11-W Serial Line Unit and Real-Time Clock option (M7856). It covers:

• General Description: Explains the dual-functionality of the DL11-W, combining serial line interfacing and line frequency real-time clock capabilities for PDP-11 Unibus systems.
• Configuration & Installation: Details switch settings for baud rates, addressing, vectors, and operating modes, along with step-by-step physical installation instructions for various PDP-11 cabinet configurations.
• Programming Information: Describes the device registers (Receiver Status, Receiver Buffer, Transmitter Status, Transmitter Buffer, and Line Clock Status), interrupt handling, and timing considerations.
• Detailed Description: Provides an in-depth look at internal logic, including address selection, interrupt logic, UART operation, maintenance mode logic, and 20mA/EIA current loop level conversion.
• Technical Appendices: Includes IC schematics and comprehensive vector addressing maps for PDP-11 systems.