DZQ11 Maintenance Card

This "DZQ11 Maintenance Card" document provides comprehensive guidance for the installation, configuration, testing, and troubleshooting of the DZQ11 module in both MicroVAX and PDP-11 computer systems.

Key areas covered include:

1. Hardware Overview and Configuration:

   • Register Codes: Details the various registers (e.g., Control & Status, Receiver Buffer, Transmit Data, Modem Status, Transmit Control, Line Parameter Registers) and their read/write properties and bit assignments.
   • Jumper and Switch Layout: Illustrates physical configuration points, including jumpers (W1-W8) for DTR/RTS/FB connections, and switch packs (E28, E13) for setting the device address, vector, baud rate, character length, stop length, and break response.

2. Basic Installation Procedures:

   • Step-by-step instructions are provided for both MicroVAX and PDP-11 systems.
   • Common steps involve unpacking components, setting device address/vector/break response switches, installing the module in the backplane, performing initial diagnostic tests with loopback connectors (e.g., H329), configuring W1-W8 jumpers, connecting appropriate cables (e.g., BC05L, BC11U-25) and distribution panels, and running final system checks (e.g., Macroverify for MicroVAX, DECX/11 for PDP-11).

3. Test Configurations and Diagnostics:

   • Test Setups: Diagrams depict various test configurations, including internal, staggered, external/cable, terminal echo, and remote link setups, often utilizing specific test connectors (H325, H329) and null modems.
   • Diagnostic Programs: Lists system-specific diagnostic software (e.g., EHXDZ, EHKMV for MicroVAX; CVDZA, CVDZB, CVDZC, DVDZD, DZITA, CXDZB for PDP-11).
   • Troubleshooting Flowcharts: Detailed flowcharts guide the user through diagnostic steps for both MicroVAX and PDP-11, helping to identify and correct problems by running specific tests, isolating faults, and indicating which components (FRUs) or lines may be defective.
   • Minimum Requirements: Specifies the hardware and software prerequisites (e.g., CPU, memory, console, test connectors, terminal) for running the diagnostics.

The document also includes a WARNING stating that procedures involving the removal of system covers should only be performed by suitably trained personnel.