INT 14 - MultiDOS Plus - TRANSMIT CHARACTER
AH = 21h
AL = character to send
DX = port number
Return: AH = 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
Note:   monitor mode must have been turned on with AH=24h before calling
SeeAlso: AH=22h"MultiDOS",AH=24h"MultiDOS"

See also: 1420

1421 - MultiDOS Plus - TRANSMIT CHARACTER