Toshiba 70CT User Guide - Page 76

Tests and Diagnostics, Memory Test, Cache memory

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3 Tests and Diagnostics 3.5 Memory Test Subtest 05 Memory module Subtest 06 NOTE: To execute this subtest, an optional memory card must be installed in the computer. This subtest functions the same as subtest 04, except it is used for testing an optional memory card. Memory module capacity is 8 MB or 16 MB. After selecting subtest 05, the following message displays: Extended memory size (1:8 MB,2:16 MB)? Select the number that corresponds to the memory card installed in the computer. Cache memory To test the cache memory, a pass-through write-read comparison of '5A' data is run repeatedly to the test area ('7000':'Program' size to '7000':'7FFF' (32 KB)) to check the hit-miss ratio (on/off status) for CPU cache memory. One test takes 3 seconds. Number of misses < Number of hits → OK Number of misses ≥ Number of hits → Fail Libretto 50CT/70CT Maintenance Manual 3-11

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3
Tests and Diagnostics
3.5
Memory Test
Libretto 50CT/70CT Maintenance Manual
3-11
Subtest 05
Memory module
NOTE:
To execute this subtest, an optional memory card must be
installed in the computer.
This subtest functions the same as subtest 04, except it is used for testing an
optional memory card.
Memory module capacity is 8 MB or 16 MB.
After selecting subtest 05, the following message displays:
Extended memory size
(1:8 MB,2:16 MB)?
Select the number that corresponds to the memory card installed in the
computer.
Subtest 06
Cache memory
To test the cache memory, a pass-through write-read comparison of ‘5A’ data
is run repeatedly to the test area (‘7000’:’Program’ size to ‘7000’:’7FFF’ (32
KB)) to check the hit-miss ratio (on/off status) for CPU cache memory.
One
test takes 3 seconds.
Number of misses
<
Number of hits
→
OK
Number of misses
≥
Number of hits
→
Fail