Technical data

3-136 Computer Group Literature Center Web Site
Test Descriptions
3
EXTN - Extended Registers
Command Input
PPCx-Diag>VGA54XX EXTN
Description
This test verifies that the Extended Sequencer, Graphics, CRT Controller,
and Pel Mask Registers are correctly functioning. Each possible pattern for
each of the registers is used with reserved bits being masked to a value of
zero.
1. Each extended register is initialized with one of 256 possible values,
with reserved bits being masked off to a value of zero.
2. The extended 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 EXTN: Extended Registers........Running --->
If all parts of the test are completed correctly, then the test passes:
VGA54XX EXTN: Extended Registers..Running ---> PASSED
If the test fails, then the display appears as follows:
VGA54XX EXTN: Extended Registers...Running ---> FAILED
VGA54XX/EXTN Test Failure Data:
Read register: _____ Index Register: _____ loaded with _____
Value read: ________ Expected: ________