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AH = 22h DX = port number
Return:
AH = status (see also AH=21h"MultiDOS") 00h successful AL = character 3Dh framing and parity error 3Eh overrun error 3Fh framing error 40h parity error 96h ring buffer overflow
Note: If no character is available, this function waits until a character arrives or an implementation-dependent timeout elapses
See Also: AH=20h"MultiDOS" - AH=21h"MultiDOS" - AH=27h
Category: Serial I/O - Int 14h - M
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