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Int 14 Fn 07 - Multidos Plus Iodrv - Get Port Status [S]
AH = 07h
Return: CL = modem status (see AH=03h)
CH = character at head of input queue (if any)
DX = number of characters in input queue
Note: the port number is stored at offset BEh in the Task Control Block
See Also: AH=03h,AH=05h"MultiDOS",AH=08h"MultiDOS",AH=09h"MultiDOS"
See Also: AH=23h"MultiDOS",INT 15/AH=13h"MultiDOS"
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