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Int 14 Fn 22 - Multidos Plus - Receive Character [S]
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
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