Int 14 Fn 88  - Comm-drv V14.0 - Turn Off Dtr                              [S]

   AH = 88h
   DX = port number

Return: AH bit 7 set on error
   AH bit 7 clear if successful
Program: COMM-DRV is a universal serial communications driver by Willies'
     Computer Software Company, which supports standard INT 14 and
     FOSSIL calls as well as its own interfaces

See Also: AX=8000h"COMM-DRV",AH=87h"COMM-DRV",AH=8Ah"COMM-DRV"