Display Test - Toshiba T3400 Maintenance Manual

3.7

Display Test

To execute the Display Test, select 4 from the DIAGNOSTIC TESTS menu, press Enter,
and follow the directions displayed on the screen. Eleven subtests test the display in various
modes. Move the highlight bar to a subtest and press Enter.
Subtest 01 VRAM Read/Write
This subtest writes constant data FFFFh, AAAAh, 5555h, 0000h and address
data to video RAM (256KB). This data is then read from the RAM and
compared to original data.
Subtest 02 Character Attributes (mode 1, 13h)
This subtest displays four character attribute modes; normal, intensified,
reverse, and blinking. The character attribute modes display foreground and
intensified color (16 colors or 16-level gray scale) using black, blue, red,
magenta, green, cyan, yellow, and white from the color display. The following
display appears when the subtest is executed.
CHARACTER ATTRIBUTES
NEXT LINE SHOWS NORMAL DISPLAY.
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
NEXT LINE SHOWS INTENSIFIED DISPLAY.
IIIIIIIIIIIIIIIIIIIIIIIIIIIIII
NEXT LINE SHOWS REVERSE DISPLAY.
RRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
NEXT LINE SHOWS BLINKING DISPLAY
BBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
PRESS [Enter] KEY
3-14
00 08 ; BLACK
01 09 ; BLUE
04 0C ; RED
05 0D ; MAGENTA
02 0A ; GREEN
03 0B ; CYAN
06 0E ; YELLOW
07 0F ; WHITE
T3400, T3400CT