Toshiba Tecra M2-S519 Maintenance Manual - Page 128

3 Tests and Diagnostics 3.5 Memory Test 3.5 Memory Test To execute the Memory Test, select 2 from the DIAGNOSTIC TEST MENU, press Enter and follow the directions on the screen. Move the highlight bar to the subtest you want to execute and press Enter. Subtest 01 Conventional memory This subtest writes constant data to conventional memory (0 to 640 KB), then reads the new data and compares the result with the original data. Subtest 02 Protected mode NOTE: The CONFIG.SYS file must be configured without expanded memory manager programs such as EMM386.EXE, EMM386.SYS or QEMM386.SYS. Also, the HIMEM.SYS must be deleted from the CONFIG.SYS file. Subtest 04 Subtest 05 Subtest 06 This subtest writes constant data (FFh, AAh, 55h, 00h) and address data (FFFFh, FFFEh,....., 0000h) to the area of 1MB to maximum MB and reads the new data and compares the result with the original data. 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 L2 Cache memory To test the L2 cache memory, a test similar to that for the cache memory is performed. 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 TECRA M2 Maintenance Manual (960-468)