DWBUA UNIBUS Adapter Technical Manual

This document is the "DWBUA UNIBUS Adapter Technical Manual", 1st Edition, published by Digital Equipment Corporation in January 1986.

It serves as a comprehensive technical guide for the DWBUA adapter, which enables communication between the VAXBI bus and the UNIBUS. The manual is intended for system programmers, support engineers, and customer engineers who need to install, test, and program this adapter.

The manual is divided into two main parts:

1. Part I: Installation: Provides an introduction to the DWBUA, its product specifications (bus loading, power/current requirements), and a list of supported UNIBUS devices. It details the physical installation procedures, initial self-test and macrodiagnostic tests, and troubleshooting guidelines.
2. Part II: Technical Description: Delves into the programming aspects, covering the system address space, specific DWBUA registers (including VAXBI required and BIIC-specific registers), and initialization procedures. It also provides a functional description of the adapter, detailing various transaction types (VAXBI-to-DWBUA, VAXBI-to-UNIBUS, and UNIBUS-to-VAXBI) and their operational flow.

The document includes numerous appendices offering supplementary information, such as:

• A glossary of terms.
• Detailed descriptions of self-test and macrodiagnostic tests.
• Information on error conditions and parity checking.
• Diagrams of supported UNIBUS devices and timing for various transactions.
• Register initial states and address space mapping.