Memory Test - Toshiba TECRA A8 series Maintenance Manual

3 Tests and Diagnostics
3.7
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
Subtest 02
NOTE: The CONFIG.SYS file must be configured without expanded memory manager
Subtest 03
Subtest 04
Subtest 05
3-16
Downloaded from www.Manualslib.com

Memory Test

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.
Protected Mode
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 (from 1MB to maximum
MB), and reads the new data and compares the result with the original data.
Protected Mode (cache off)
This subtest executes the same way as the subtest 02 with the cache off.
Cache memory (on/off)
To test the cache memory, a pass-through write-read comparison of '5Ah'
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
Stress
Write/Read buffer (1 size = 1B30h) is prepared in the conventional memory.
The data is made in the Write Buffer, the data in Write Buffer is written in the
area of address of 1MB or after. The data is red in the Read Buffer and data is
compared in area up to the maximum size.
Data: FFh, FFh, FFh, FFh, FFh, 00h, 00h, 00h, 00h,
FFh, FFh, FFh, 00h, FFh, 00h, 00h, FFh, 00h,
00h, FFh, FFh, FFh, FFh, 00h, 00h, 00h, AAh
[CONFIDENTIAL]
manuals search engine
TECRA A8 /Satellite Pro A120 Maintenance Manual (960-573)

3.7 Memory Test