Toshiba Satellite A40 Series, Maintenance Manual

Page: 134 / 419

3.5 Memory Test 3 Tests and Diagnostics
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 a 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 (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.
Subtest 06 Stress
Data (from 1MB to the maximum MB) is written from the 16KB write buffer
to the 16KB read buffer and compared the data in the buffers. The read buffer
starts from 0001 and the comparison is continued with the following read
buffer addresses: 0001, 0003, 0005, 0007, 0009, 000b, 000d and 000f.
Satellite A40 Maintenance Manual (960-458) 3-13