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AH = 21h AL = character to send DX = port number
Return:
AH = status (see #00350)
Note: Monitor mode must have been turned on with AH=24h before calling
See Also: AH=20h"MultiDOS" - AH=22h"MultiDOS" - AH=24h"MultiDOS"
(Table 00350) Values for MultiDOS Plus status: 00h successful 39h no DSR or CTS 3Ch no DSR 3Bh no CTS 41h no such port 42h monitor mode not active 97h timed out
Category: Serial I/O - Int 14h - M
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