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AH = 09h AL = option byte (see #00337) DX = port number???
Return:
AL = old option byte
See Also: AH=00h"MBBIOS" - AH=04h"MBBIOS" - AH=10h"FOSSIL"
Bitfields for MBBIOS option byte: Bit(s) Description (Table 00337) 0 transmit buffering enabled 2 hardware handshaking enabled 5 high-speed option enabled (see AH=00h"MBBIOS",#00302) other reserved
Category: Serial I/O - Int 14h - M
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