Casio QT-6600 Service Manual page 61

[ 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).
00000000h
VRAM
16MB
00FFFFFFh
01FC0000h
LIME
Register Area
01FFFFFFh
[Operation]
Operation : n
n: Number of times
0 or no value
A value other than 0 (1 ~ 9) Tests repeat infinitely (press ESC to terminate)
[LCD]
LCD VRAM
LCD VRAM
LCD VRAM
END
* If an NG occurs, the address of the error is displayed /printed out.
* The counter is displayed on the LCD during the test.
Display Area
(3Mbyte)
TestArea
* LIME : Internal Memory Area
7 2 1 ST
To perform a single test
721
OK
NG address
721
— 58 —
00300000h
00FFFFFFh
[PRINT]
LCD VRAM
LCD VRAM
LCD VRAM
END
721
OK
NG address
721