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X-Hacker.org- Programmers Reference 0.02b - <b>int 14h, 06h raise/lower dtr</b>
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INT 14h, 06h Raise/lower DTR
Entry: DX Port number
AL DTR state to be set (01h = Raise, 00h = Lower)
Exit: None
This function is used to control the DTR line to the modem. AL = 00h
means lower DTR (disable the modem), and AL = 01h means to raise DTR
(enable the modem). No other function (except Init) should alter DTR.
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