Locating A Defective Ram Block - HP 200 Series Hardware Support Document

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Troubleshooting and Diagnostics
Locating a Defective RAM Block
The RAM tests have error messages containing addresses of the form MNPQRS (hexadecimal).
The RAM block causing an error is easily found using the paragraphs above on checking a RAM
card address. Any RAM address MNPQRS is located on the card containing the address block
MNOOOO to MNFFFF. Convert the MN digits into binary, then find a RAM block with switch settings
which match the binary number.
For instance, in the error message
Memory Failed at FB53A9 W:F58A8C2C, R:F78A8C2C
the defective RAM is on a board with a starting address of FBOOOO. FB in binary is 11111011. Thus
the switch setting of the defective board would be:
if
a 256K RAM card, or
if
aIM RAM card.
Locate the board with this switch setting.