dynabook dynaEdge DE200 Series, Руководство по обслуживанию

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3 Tests and Diagnostics
3-12
[CONFIDENTIAL] dynaEdge DE200 Series Maintenance Manual (960-947)
3.6 Memory Test
To execute the Memory Test, select 1 from the DIAGNOSTIC TEST Menu (Main Test
Menu), press
Enter
and follow the directions on the screen.
Subtest 1 [Main memory Test]
This test writes/reads the test data to/from the main memory, and compares them.
The test procedure is as follows;
(1) This test gets the memory map table.
(2) It seeks empty area.
(3) To the whole empty area, it writes the test data and reads out them to compare the
test data and read data.
(4) Up to the maximum address of the mounted memory, it repeats to seek the empty
area, to write the test data, to read out the data and to compare the test data and
read data.
(5) It repeats the process from (1) to (4) above with the 4 test patterns.
The test patterns are 4-byte data; 00000000h, 55555555h, AAAAAAAAh and
FFFFFFFFh. If empty area less than 3-byte length is found, the test data is not
written.
If the empty memory is 64MB or less, this test is not executed. In the case that this
test is never executed because of the memory size shortage, this test displays the
message “
Data Not Found
“and writes this information to the text file
(errorlog.txt) as an error log.
If the test data and read data is not the same at comparing, this test displays the
message “
Data Compare error
“and writes this information to the text file
(errorlog.txt) as an error log.
As for the details of the error log, refer to 3.12 Log utility.
Subtest 2 [V-RAM memory Test]
This test sets the display mode to the maximum resolution. Then it writes/reads the
test data to/from the VRAM area, and compares them.
This test checks the VRAM area in order with the following 4 test data;
FFFFFFFFh
、 AAAAAAAAh 、 55555555h 、 00000000h.
If the test data and read data is not the same at comparing, this test displays the
message “
Data Compare error
“and writes this information to the text file
(errorlog.txt) as an error log.