Toshiba PRO L645 Manual Do Utilizador

To execute the High Resolution Display Test select 09 from the Diagnostic Test Menu, press 
Enter and follow the directions on the screen. The High Resolution Display Test contains six 
subtests that test the computer's high resolution video display. Move the highlight bar to the 
subtest you want to execute and press Enter. 

Subtest 01 

VRAM W/R/C Test  

This subtest writes address and data patterns to Video RAM, then reads the 
values from the Video RAM and compares them to the original test patterns. 
During the execution of this test 13 different color screens display: black, 
green, green, blue, blue, red, red, red, black, white, pink, cyan, and black. 

1.  Sets the video display to 1024*768 mode  
 
2.  Bank change test 

Writes 1 byte data in order 0, 1, through Fh, and compares the result, 
at every bank, to the original data patterns. 

 
3.  Bit shift data test 

Writes 01h data into addresses A000:0000h through A000:FFFFh for 
each bank, reads the new data and, then compares the results with the 
original data. Data is then shifted 1 bit to the left, and all bits (01h, 
02h, 04h, 08h, through 80h) are tested again. 
 

4.  Fixed data test 

Writes test data (in order FFh, AAh, 55h, 00h) into addresses 
A000:0000h through A000:FFFFh for each bank by, reads the new 
data and, then compares the results with the original data. Data is then 
shifted 1 bit to the left, and all bits are tested again