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INT 14 - MBBIOS - GET/SET OPTIONS
        AH = 09h
        AL = option byte
                00000001b - Transmit Buffering Enabled
                00000101b - Hardware Handshaking Enabled
                00100000b - High Speed Option Enabled
        DX = port number???
Return: AL = old option byte
SeeAlso: AH=10h"FOSSIL"

See Also: 1404
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