global outb ; outb - Send a byte to an I/O port. ; stack: [esp + 8] The data byte ; [esp + 4] The I/O port ; [esp ] Return address outb: mov al, [esp + 8] ; Move the data to send into the AL register mov dx, [esp + 4] ; Move the address of the I/O port into the DX register out dx, al ; Send the data to the I/O port ret ; Return