Advantech AIMB-784 User Manual page 70

 CSM16 Parameters
Enable/Disable Option ROM execution settings, etc.
GateA20 Active

Upon request-GA20 can be disabled using BIOS service.
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
 INT19 Trap Response
"Immediate or Postponed" Option ROM to trap Interrupt 19
AIMB-784 User Manual 60