DZQ11 Asynchronous Multiplexer

This technical manual provides comprehensive documentation for the DZQ11 asynchronous multiplexer, a Q-bus option that interfaces between a Q-bus processor and four asynchronous serial data communication lines. The manual includes:

• General Description: Overview of capabilities, including baud rate, parity, and interrupt control.
• Installation: Procedures for unpacking, jumper configuration, module installation in Q-bus and MicroVAX systems, and address/interrupt vector assignments.
• Device Registers: Detailed bit-level descriptions of registers such as the Control and Status Register (CSR), Receiver Buffer (RBUF), and Transmitter Control Register (TCR).
• Programming: Guidelines for efficient programming, including interrupt management and silo emptying.
• Technical Description: In-depth explanation of hardware functionality, including the Q-bus interface, line multiplexer, and power supply.
• Maintenance: Preventive and corrective maintenance strategies, including diagnostic programs like CVDZA, CVDZB, and EHXDZ.
• Appendices: Descriptions of integrated circuits (DC003, DC004, DC005, DC367B) and a glossary of terms.