Display Test - Toshiba T4500 User Manual

3.7

Display Test

To execute the Display Test, select 4 from the DIAGNOSTIC TEST MENU, press Enter and
follow the directions displayed on the screen. The Display test contains twelve subtests that test
the computer's display in various modes. Move the highlight bar to the subtest you want to ex-
ecute 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 video RAM and compared to
the original data.
Subtest 02 Character Attributes (mode 1, 13h)
This subtest displays the following character attribute modes; normal, intensified,
reverse, and blinking as shown in the display below. The character attribute modes
display the foreground color 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 display below appears on the screen when this subtest is executed.
CHARACTER ATTRIBUTES
3-14
NEXT LINE SHOWS NORMAL DISPLAY.
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
NEXT LINE SHOWS INTENSIFIED DISPLAY.
IIIIIIIIIIIIIIIIIIIIIIIIIIIIII
NEXT LINE SHOWS REVERSE DISPLAY.
RRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
NEXT LINE SHOWS BLINKING DISPLAY
BBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
2: Continue
3: Retry
00 08 ; BLACK
01 09 ; BLUE
04 0C ; RED
05 0D ; MAGENTA
02 0A ; GREEN
03 0B ; CYAN
06 0E ; YELLOW
07 0F ; WHITE