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OUT Commands

Out commands can be used to send 8, 16, or 32 bit values to I/O ports at boot time:

OUTB  Port  Value 
OUTW  Port  Value 
OUTD  Port  Value

OUTB sends the byte Value to port address Port. OUTW sends the word Value to port address Port. OUTD sends the dword Value to port address Port.

Initializing Target Hardware

Delay Command