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3.5.1 CSM16 Parameters
GateA20 Active
Upon Request: GA20 can be disabled using BIOS services.
Always: do not allow disabling GA20; this option is useful when any RT code is
executed above 1MB.
Upon Request / Always
Option ROM Messages
Set display mode for Option ROM.
Force BIOS / Keep Current
INT19 Trap Response
BIOS reaction on INT19 trapping by Option ROM:
Immediate --- execute the trap right away; Postponed --- execute the trap during the
legacy boot.
Immediate / Postponed
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