UPGRADING REPAIRING PCs
UPGRADING REPAIRING PCs
UPGRADING REPAIRING PCs
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Startup and<br />
observe POST.<br />
If errors are<br />
encountered,<br />
go to defect<br />
isolation<br />
procedures.<br />
Defect<br />
Isolation<br />
Procedures<br />
If count does<br />
not match, go to<br />
defect isolation<br />
procedures.<br />
If problems are<br />
encountered, go<br />
to Defect Isolation<br />
Procedures.<br />
Figure 2.13 Follow these steps if you are still encountering memory<br />
errors after completing the steps in Figure 2.12.<br />
Table 2.18 Memory Usage in the 640KB–1MB Range<br />
Device Address Range Notes<br />
Graphics Mode<br />
Video RAM<br />
0A0000–0AFFFF<br />
Monochrome Text<br />
Mode Video RAM<br />
0B0000–0B7FFF<br />
Color Text Mode<br />
Video RAM<br />
0B8000–0BFFFF<br />
Video ROM for<br />
VGA, Super VGA<br />
0C0000–0C7FFF<br />
Memory Types 47<br />
If POST completes<br />
with no errors,<br />
basic functionality<br />
has been tested.<br />
Restart system,<br />
enter BIOS (or CMOS)<br />
setup. Verify that<br />
memory count is<br />
equal to installed<br />
amount.<br />
While in the BIOS,<br />
set all cache options<br />
to disabled, save<br />
settings and boot to<br />
a DOS formatted<br />
(floppy) system disk.<br />
Use a diagnostics<br />
program to test<br />
system base and<br />
extended memory.<br />
If no problems are<br />
encountered, memory<br />
has tested OK.<br />
Reboot, enter BIOS<br />
setup re-enable.
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