Console Mode - Digital Equipment VAXstation 4000 90 Service Information

Console Mode

Overview
Console Mode
Input and
Output
The VAXstation 4000 Model 90 console mode allows operation of a
console device, which can be one of the following:

A workstation video device and LK401 keyboard and mouse

A terminal connected to line three of the serial port

A remote system connected using the Ethernet
The console mode can be entered if:

The HALT parameter is set to halt when power is turned on.

A HALT instruction is executed with the HALT action set
to HALT or a severe processor condition occurs (such as an
invalid interrupt stack).

An external HALT is detected (pressing the halt button on
the front panel).
In console mode input and output (I/O) routines are used by:

Self-Test

Extended self-test

Utilities

System test

Virtual memory boot (VMB)
2–5