IBASE ASTUT-XX1-PC1S - Manual (Page 63)

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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.
Option ROM Messages
Set display mode for Option ROM. Options: Force BIOS and Keep Current.
Interrupt 19 Capture
Enable: Allows Option ROMs to trap Int 19.
Boot Option Priorities
Sets the system boot order