DEC VAXstation 3100 Owner's Manual page 118

When the system detects a memory error, you see double question
marks and a second 8-digit error code in line two. For example:
?? MEM 0008.0020
01000000 00000023
The new error code in line two indicates the module or modules
containing failed memory. A digit other than 0 in the first seven
digits indicates an error in a memory module. For example, the 2
in the example error code indicates an error in a memory module.
A digit other than 0 in the last digit indicates failing memory on
the system module. For example, the 3 in the last digit of the
error code indicates failing memory on the system module.
lb use the error code to determine the failing modules, do the
following:
1 Find the nonzero digits in the error code.
2 Refer to Table 7-4 and find the line that shows your system's
total module configuration.
3 Locate each nonzero digit's position in the line for your module
configuration. The positions are numbered 1 through 8 firom
left to right and correspond to the digits in the error code.
The entry at each nonzero position indicates a failing module
as follows:
• S indicates an error in the system module memoxy.
• 4 indicates an error in the 4-megabyte module.
• 8 indicates an error in the 8-megabyte module.
• 12 indicates an error in the 12-megabyte module.
• 16 indicates an error in the 16-megabyte module.
Running Diagnostics 7-13