O port byte
port
A 16-bit port address.
byte
Byte to send to port.
The Port Output (O) command sends a byte value to a hardware port. You use this command to debug a program that interacts directly with hardware.
The Port Output command is often used with the Port Input (I) command.
In the following example, the byte value 4F hexadecimal is sent to output port 2F8.
>O 2F8 4F ;* hexadecimal radix assumed
>