PS/2 Memory Problems at POST

Memory Problems

Models 50, 55, 60, 65, 70 and 80

NOTE: For other Models, see the following information.

Finding the Failing Memory

NOTE: Running customer diagnostic tests will deallocate defective memory. After you replace defective memory, run the memory diagnostic test to enable the replacement memory. Then restart the computer and rerun the same test to validate the installed memory-module kits. 

Use the following procedure when you suspect a problem with the system memory.
  1.  Run the advanced-memory diagnostic test. If the test does not indicate which memory-module kit failed,  or if the system hangs, try running the test from the System Diskettes. If you still cannot identify which  memory-module kit failed, return here and continue with the next step.
    NOTE: If a screen message appears, asking you have replaced a specific memory-module kit, suspect that it is the failing kit.
  2.  Using a known-good kit, exchange each kit, one at a time, and repeat the memory diagnostic test until you find the defective kit.  Replace only the defective kit. If the kits are not the problem, suspect:

Models 53 (9553-xBx) 56, 57, 76, 77, 85, 90 and 95

On these systems, the X digit of the POST error (for example 00020xXx), indicates the socket location.

Determining Failing Memory Location

56, 57
76, 77
85, 95
X = 1 Mem 1 Mem 1 J1 (J11) A1
X = 2 Mem 3 Mem 3 J3 B1
X = 3 Mem 2 Mem 2 J2 A2
X = 4 Mem 4 Mem 4 J4 B2
X = 5     J1 (J14) A3
X = 6     J2 B3
X = 7     J3 A4
X = 8     J4 B4
X = U UNKNOWN      

When a mixture of 4MB, 8MB and 16MB (or larger) memory-module kits are installed in the 9585-xKx and 9585-xNx computers, the smaller kits must be installed in the higher-numbered connectors (A4/B4 is the highest), and the larger kits in the lower numbered connectors (A1/B1 is the lowest.

Determining Memory Type, Size and Speed

The Y digit of the POST error (for example, 00020xxY), indicates the type, size and speed.

Type Size Speed
Y = 0 Parity 4MB 80 ns
Y = 1 Parity 2MB 100 ns
Y = 2 Parity 1MB 100 ns
Y = 4 Parity 4MB 70 ns
Y = 5 Parity 2MB 85 ns
Y = 6 Parity 1MB 85 ns
Y = 8 Parity 8MB 80 ns
Y = 9 Parity 2MB 80 ns
Y = B Parity 8MB 70 ns
Y = C Parity 2MB 70 ns
Y = D Parity 2MB 120 ns
Y = E Parity 1MB 120 ns
Y = K ECC 16MB 70 ns
Y = Q ECC 4MB 70 ns
Y = R ECC 32MB 70 ns
Y = S ECC 8MB 70 ns
Y = T ECC 2MB 70 ns

If you are still unable to determine which memory-module kit failed, follow the above described 'Finding the Failing Memory'  isolation procedure.

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