Toshiba A20-S259 Maintenance Manual - Page 126
Tests and Diagnostics, Memory Test, L2 Cache Memory
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3 Tests and Diagnostics 3.5 Memory Test Subtest 04 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 Subtest 05 L2 Cache Memory To test the L2 cache memory, a test similar to that for the cache memory is performed. Subtest 06 Stress The conventional memory is provided with a write/read buffer (size 1b30 h) and creates write data in the write buffer. Subsequent to 1 MB, the data is written in the write buffer and is read into the read buffer, followed by a data comparison up to the maximum memory size. 3-14 Satellite A20 Maintenance Manual (960-444)