DL11-W Serial Line Unit/Real-Time Clock Option

The DL11-W Serial Line Unit/Real-Time Clock Option (M7856) is a dual-function quad module for PDP-11 systems. It provides a character-buffered interface for serial communication (supporting various terminal types like Teletypes and EIA terminals) and an independent, line-frequency real-time clock for timed interrupts.

Key features include: - Serial Communication: Supports 20 mA current loop and EIA interfaces with switch-selectable baud rates, parity, character size, and stop bits. - Real-Time Clock: Generates line-frequency interrupts for time-keeping. - Configuration: Features dip-switch settings for addressing, vector assignment, and mode selection (including maintenance mode for loop-back testing). - Programming: Interacts with the system through five device registers (Receiver Status, Receiver Buffer, Transmitter Status, Transmitter Buffer, and Line Clock Status).

The manual details technical specifications, pin connections for cables (including 7008360 and BC05C), and installation procedures within PDP-11 backplanes.