DJ11 Asynchronous 16-Line Multiplexer

This maintenance manual provides a detailed description of the DJ11 asynchronous 16-line multiplexer. It covers the following topics:

• General Description: Overview of the DJ11, its purpose in a PDP-11 system, and technical specifications.
• Installation: Configuration requirements, switch and jumper settings for different line groups, and installation procedures for various models (DJ11-AA, DJ11-AB, and DJ11-AC).
• Programming: Details on addressable registers, including the Control Status Register (CSR), Receive Buffer Register (RBUF), Transmit Control Register (TCR), Transmit Buffer Register (TBUF), and Break Control Status Register (BCSR).
• Detailed Description: In-depth explanation of the functional blocks, including the receiver scanner, transmitter scan control, clock logic, and buffer handling.
• Maintenance: Preventive and corrective maintenance procedures, including diagnostic testing using MAINDEC programs and fault location tables.
• Engineering Data: Reference information for signal definitions and schematics.