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SCSI Activity LEDs (H8SSP-
8 only)
There are two SCSI activity LEDs on
the serverboard. When illuminated,
DA1 indicates activity on SCSI chan-
nel A and DA2 indicates activity on
SCSI channel B.
POST Code LEDs
Eight surface-mounted LEDs are located near one end of the 1UIPMI slot. These
LEDs are used to provide POST code information. See the diagrams below for
reading the LEDs and refer to Appendix B for a complete list of POST codes.
↑
Toward edge of board
1
2
DB1-4
4
8
1
2
DB5-8
4
8
Example:
1
2
DB1-4
4
8
1
2
DB5-8
4
8
= Illuminated LED (1)
= Unilluminated LED (0)
SCSI Channel Activity LEDs
(DA1/DA2)
State
System Status
On
SCSI Channel Active
Off
SCSI Channel Inactive
Reading the POST Code LEDs
When on, each of the eight separate LEDs
represent the value of the number shown
beside it in the diagram on the left. Add up
the numerical values of each illuminated
LED in the DB5-DB8 column to get the high
(left) digit and those in the DB1-DB4 column
to get the low (right) digit of the correspond-
ing POST code.
Example:
The example on the left indicates a hexa-
decimal POST code of C6. This is deter-
mined in the following manner:
DB1-DB4 (low digit): 4 + 2 = 6
DB5-DB8 (high digit): 8 + 4 = 12
(decimal 12 = hexidecimal C)
Decimal
Hexidecimal Equivalent
0-9
0-9
10
A
11
B
12
C
13
D
14
E
15
F
2-17
Chapter 2: Installation
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