Position Of Diagnostic Display Lights - Digital Equipment 300 Series AXP Reference Manual

Figure 8–1 Position of Diagnostic Display Lights
Display Light
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Patterns
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When you power up the system, all lights come on and
flash through a sequence of patterns, which are binary
representations of the hexadecimal codes. If a problem is
detected during system power-up, the lights are lit in a
pattern that indicates either the current system status or a
problem.
When power-up tests have completed successfully and the
system is at console mode (>>>), the lights are lit in the
following binary pattern:
on on off on on on off on
7 6 5 4 3 2 1 0
In hexadecimal code, this pattern is DD, where the first D
refers to the left set of four lights; the second D refers to the
right set of four lights.
When the operating system is running, all diagnostic lights
should be off.
Refer to DEC 3000 Model 300 Series AXP Service Guide for
a complete listing of hexadecimal codes, their binary (LED)
equivalent, and their meaning.
Preliminary Power-up Test Displays
7 6 5 4 3 2 1 0
MLO-009795
       
[OR]
8–3