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3 Tests and Diagnostics 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 a 256-byte unit of constant data to conventional memory
(0 to 640 KB). Then reads the new data and compares the result with the
original data. The content of the memory to be tested is saved before the test
and it is restored after the test.
The constant data is FFFFh, AAAAh, 5555h, 0101h and 0000h.
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 (FFh, AAh, 55h, 00h) and address data
(FFFFh, FFFEh, … 0000h) to from 1MB to the maximum MB then reads the
new data and compares the result with the original data and executes the
address bit test (in 64KB unit. FFh, FEh, …).
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’:’7FFF’
(32KB)) 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 → Fail
3-12 Satellite A10/TECRA A1/Satellite Pro A10 Maintenance Manual (960-445)