Category: <b>serial I/O</b>
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<pre><b>INT 14 - COMM-DRV v14.0 - TURN ON DTR</b>

	AH = 87h
	DX = port number
Return: AH bit 7 set on error
	AH bit 7 clear if successful
SeeAlso: AX=8000h"COMM-DRV",AH=88h"COMM-DRV",AH=89h"COMM-DRV"
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