IEU11-A/IEQ11-A User's Guide

This document is the "IEU11-A/IEQ11-A User's Guide," a technical manual published by Digital Equipment Corporation in November 1985. It is intended for field service engineers and users responsible for installing, programming, or maintaining the IEU11-A and IEQ11-A hardware options down to the Field Replaceable Unit (FRU) level.

The IEU11-A option is a Direct Memory Access (DMA) controller designed to interface UNIBUS systems (such as PDP-11 and VAX-11) with two independent IEC/IEEE instrument buses. The IEQ11-A option is a similar DMA controller for Q-Bus systems (like LSI-11, MICRO/PDP-11, and MICRO/VAX), connecting them to the same IEC/IEEE bus standards (European Standard IEC 625-1 and U.S. Standard IEEE 488-1978). Both options are capable of connecting up to fifteen devices per instrument bus and utilize the TMS 9914A General Purpose Interface Bus (GPIB) Controller chip.

The guide is structured to provide comprehensive information across various aspects:

• General Description: Introduces the IEU11-A/IEQ11-A options, detailing their physical characteristics, application examples, functional descriptions (including bus interface messages, functional device types, and IEEE 488-1978 interface functions), and general specifications (environmental, electrical, and performance).
• Installation: Provides step-by-step procedures for unpacking, configuring the M8648 (for IEU11-A) and M8634 (for IEQ11-A) modules, physical installation, verifying module operation, and interconnecting the IEC/IEEE buses.
• Programming: Offers in-depth information for software control, defining device registers (such as IEEE Status, Interrupt, Command, Data, Control and Status, Bus Address, Byte Count, and Match Character Registers), their bit abbreviations, and how to implement various auxiliary commands and handshake functions based on the TMS 9914A controller's architecture.
• Maintenance: Outlines procedures for corrective maintenance, including required tools and the use of diagnostic software to troubleshoot and repair faults.

Appendices offer additional technical details on standard connections, remote message coding, handshake process timing sequences, and multiline interface messages.