Technical data

Chapter 2

Firmware

Overview

Introduction

This chapter provides an overview of the VAXstation 4000 Model

90 system ﬁrmware. The ﬁrmware is located in four EPROMs,

which hold a total of 512 KB of data. The system ﬁrmware

has ﬁve distinct areas of operation. This chapter discusses the

following topics:

Power-Up Initialization Code

Console Mode

Extended Self-Test

Utilities

System Test

System ROM

Option ROM

Conﬁguration Table

Driver Descriptor

Interfacing to Diagnostic Drivers

Console Driver Interface

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