KW11-L line time clock

This document is the manual for the KW11-L Line Time Clock, an option for the PDP-11 computer system designed to provide accurate time intervals based on line frequency (50 or 60 Hz). The manual covers:

• General Description: Explains the M787 module's function, its status register, and how it handles interrupts.
• Detailed Operation: Describes the address selector, threshold detector, and interrupt control logic.
• Programming: Provides example code for both interrupt-driven and non-interrupt modes of operation.
• Technical Data: Includes a block diagram, simplified logic diagrams, and specifications for the module's interface with the Unibus.