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Int 14 Fn 22 - PC-mos/386 V5.01 $serial.sys V5.04 - Receive Character, W [S]
AH = 22h
DX = port number
SI = timeout in timer ticks (0000h = default)
Return: AH = port status (see AH=03h bits 0..6)
bit 7 = 1 indicates time-out
AL = character received
Program: PC-MOS/386 v5.01 is a multitasking, multiuser MS-DOS 5.0-compatible
operating system by The Software Link, Inc.
See Also: AH=02h,AH=0Fh"PC-MOS",AH=21h"PC-MOS"
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