User`s guide

T-MOPSlcdSA User's Guide
Appendix B: BIOS Operation 57
57
19.8.2 Cache & Shadow Configuration Submenu
Feature Option Description
Internal Cache(*) Write-Through
Write-Back
Selects the mode of the internal processor cache:
Write-Through: Writes are sent to main memory at once.
Write Back: Writes are only sent to main memory until necessary.
Cache Video BIOS Disabled
Enabled
Disabled/Enabled: switches caching of video BIOS off or on.
C000, 16K Shadow (**) Disabled
Enabled
Disabled/Enabled: switches a 16K memory block shadowing off or on. When
shadowing is enabled, all accesses go to the main memory shadow region.
When shadowing is disabled, the same accesses would go to the ISA bus
addresses.
C400, 16K Shadow(**) Disabled
Enabled
See above.
C800, 16K Shadow Disabled
Enabled
See above.
For every 16K block
E800, 16K Shadow Disabled
Enabled
See above.
EC00, 16K Shadow Disabled
Enabled
See above.
Notes:
In the Option column, bold shows default settings.
(*) Don’t set Internal Cache to Write Through, this may cause system failures. Therefore this Setup
entry was removed with BIOS version PEXTR113 and later. The cache was always set to Write
Back.
(**) These Setup entries are not available since BIOS version PEXTR113 because Cache Video
BIOS already takes care of these UMB areas.