Technical data

Overview and Updates
Memory LED Diagnostic Codes
The following memory LED code table supersedes and corrects the table on page 14−4 of
the DEC 3000 Models 600/600S AXP and 800/800S AXP Service Information manual.
The following LED codes represent memory diagnostic tests. If an error occurs during one
of these tests, the screen displays an FRU code and error code.
Table 1-19 Memory LED Diagnostic Codes
Hex Code Description
20 Machine Check
21 CELL Fill mem with test Pattern data
22 CELL Forward RD/Compare/Complement/Wr
23 CELL Reverse RD/Compare/Complement/Wr
24 ADDR Fill mem with addresses as data
25 Refresh test in progress
26 ADDR Read/Compare data = address
27 BITS Fill mem with a pattern of 1's in a field of 0's
28 BITS Read/Compare data = pattern
29 Reserved
2A Reserved
2B LLSC load-locked/store-conditional tests
2C B-cache tag parity detection
2D ECC detection
2E Reserved
2F Clear memory to zeros
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