DZ11

This document, the DZ11 Maintenance Manual, is a technical guide intended for field service personnel. It covers the DZ11 asynchronous multiplexer, which provides an interface between a PDP-11 processor and eight asynchronous serial lines. The manual includes:

• General Description: Provides an overview of the DZ11 configurations, physical description, and functional block diagrams.
• Installation: Details unpacking, inspection, and the installation procedure, including jumper settings, cabling requirements, and connection to terminals or modems.
• Programming: Describes register bit assignments (CSR, RBUF, LPR, TCR, MSR, TDR), programming features (baud rate, character length, parity, interrupts), and provides sample programs for various configurations.
• Detailed Description: Explains the operation of the Unibus interface, the scanner, the UARTs, and the data flow between the Unibus and the serial lines.
• Maintenance: Outlines preventive maintenance (mechanical checks, diagnostic software) and corrective maintenance (troubleshooting procedures, internal/staggered loopback modes, on-line testing).
• Appendices: Include technical data on integrated circuits and a glossary of terms related to the DZ11 system.