Toshiba R100 manual Memory Test

3 Tests and Diagnostics 3.5 Memory Test

3.5Memory Test

To execute the Memory Test, select 2-MOMORY TEST from the DIAGNOSTIC TEST MENU, press Enter and follow the directions on the screen. The Memory test contains six subtests that test the memory module. Move the highlight bar to the subtest you want to execute and press Enter.

Subtest 01 Conventional Memory

This subtest writes data to conventional memory (0 to 640 KB). Then reads and compares the result with the original data. The test address is displayed each 4 KB.

Subtest 02 Protected Mode

NOTE: The CONFIG.SYS file must be configured without extended memory manager programs such as EMM386.EXE, EMM386.SYS or QEMM386.SYS. Also, the HIMEM.SYS must be deleted from the CONFIG.SYS file.

This subtest writes constant data and address data then reads the new data and compares the result with the original data.

Subtest 03 Memory module

This subtest writes constant data and address data in an expanded memory module then reads the new data and compares the result with the original data.

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’:’7EEE’ (32 KB)) to check the hit-miss ratio (on/off status) for CPU cache memory.

Number of misses < Number of hits → OK

Number of misses ≥ Number of hits → NG

3-12 PORTEGE R100 Maintenance Manual (960-440)