Int 14 Fn 09 - Multidos Plus Iodrv - Reset Port Status [S]
AH = 09h
Return: modem status byte cleared
Note: the port number is stored at offset BEh in the Task Control Block
See Also: AH=04h"MultiDOS",AH=07h"MultiDOS",INT 15/AH=13h"MultiDOS"
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