Casio QT-6600, Service Manual

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[ 16 ] VRAM CHECK Test
[Function]
Checks VRAM of the LCD.
All areas except for the GDC system area are subjected to this test.
VRAM is not backed up by the battery. A power failure during the test results in an error.
This test uses the same test data as RAM Test to write on VRAM.
[Operation Overview]
(1) Write the test data from the beginning to the end of VRAM Test area.
(2) Verifies the written data from the beginning to the end of VRAM Test area.
(3) Displays and prints out the test result.
* If an error occurs, the test is immediately terminated and the result is displayed and printed out.
If the test is set to repeat indefinitely, the operation returns to Step (1) and continues the test.
* When the test is set to repeat indefinitely, Steps (1) through (3) repeat as a set until [ESC] is
pressed.
[Test area]
This test targets the free areas of VRAM (TestArea).
VRAM
16MB
Display Area
(3Mbyte)
TestArea
LIME
Register Area * LIME : Internal Memory Area
00FFFFFFh
00300000h
00FFFFFFh
01FC0000h
01FFFFFFh
00000000h
[Operation]
Operation : n 7 2 1 ST
n: Number of times
0 or no value
To perform a single test
A value other than 0 (1 ~ 9) Tests repeat infinitely (press ESC to terminate)
[LCD] [PRINT]
LCD VRAM 721
LCD VRAM OK
LCD VRAM NG address
END 721
LCD VRAM 721
LCD VRAM OK
LCD VRAM NG address
END 721
* If an NG occurs, the address of the error is displayed /printed out.
* The counter is displayed on the LCD during the test.