Memory Test - Toshiba A20-S259 - Satellite - Pentium 4 2.66 GHz Maintenance Manual

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.
This subtest writes constant data and address data to extended memory (maximum
address 100000h) then reads the new data and compares the result with the original
data.
The constant data is FFh, AAh, 55h, and 00h.
Satellite A20 Maintenance Manual (960-444)
3 Tests and Diagnostics
3-13