Technical data

3-134 Computer Group Literature Center Web Site
Test Descriptions
3
CRTC - CRT Controller Registers
Command Input
PPCx-Diag>VGA54XX CRTC
Description
This test verifies the correct operation of the VGA CRT Controller
Registers. The test proceeds as follows:
1. Each CRT Controller Register is initialized with one of 256 possible
values, with reserved bits being masked off to a value of zero.
2. The CRT Controller Register is read back to verify that the data that
was written to the register in step 1 was written correctly.
Response/Messages
After the command has been issued, the following line is printed:
VGA54XX CRTC:CRT Controller Registers....Running -->
If all parts of the test are completed correctly, then the test passes:
VGA54XX CRTC:CRT Controller Registers...Running --> PASSED
If the test fails, then the display appears as follows:
VGA54XX CRTC:CRT Controller Registers..Running --> FAILED
VGA54XX/CRTC Test Failure Data:
Data Register: ________ Index: _____
Value Read: ________ Expected: _______