HP 9800 SERIES User Manual

4-10 9845B/C Mainframe Troubleshooting
Memory Troubleshooting
These memory maps and hardware locators show how to interpret memory error messages
obtained from system exerciser
and diagnostic memory tests.
Error message decoding:
RWM error example;
MEMORY ERROR BLK BB ADDRESS AAAAA HAS XXXXXX NOT YYYYYY
BB = The octal block number, hardware correllation is;
a = A28 1 = A27
2,4, 6, 10, 12, 14, 16 are on A26. 2 is not used.
AAAAA = Is the octal address in the range 000040-077777,
If most significant digit is 0-3, address is low.
If most significant digit is 4-7, address is high.
XXXXX = Data read from address.
YYYYY = Data written into address.
To determine bit that failed, convert octal data to binary.
Example,
XXXXXX = 000400 = 000 000 000 100 000 000
yyyyyy = 000000 = 000 000 000 ~OO 000 000
Failed bit ---------~-
ROM error example:
Count binary bits from the right starting with zero, the failed bit
is 8. Refer to the hardware diagrams for bit/chip location on the
memory board.
ROM CHECKSUM FAILURE BLK BB ADDRESS SSSSSS - EEEEEE
BB = Octal block number, the hardware correlation is;
3 = A28(46)
7,13, = A44
5
= A27
11,15 = A42
SSSSSS = Starting address of the ROM that failed.
EEEEEE
= Ending address of the failed ROM.

HP 9800 SERIES Specifications

General

Brand	HP
Model	9800 SERIES
Category	Storage
Language	English