Memory Test - Toshiba Portege 2000 Maintenance Manual

3.5 Memory TestMemory Test
3.5

Memory 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 five
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 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
Portege 2000 Maintenance Manual (960-333)
3 Tests and Diagnostics
3-11