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From: K538915@CZHRZU1A.BITNET
Newsgroups: comp.sys.atari.st
Subject: RE: DCD and RI detection
Message-ID: <8701102327.AA22563@ucbvax.Berkeley.EDU>
Date: Sat, 10-Jan-87 14:08:00 EST
Article-I.D.: ucbvax.8701102327.AA22563
Posted: Sat Jan 10 14:08:00 1987
Date-Received: Sat, 10-Jan-87 23:46:34 EST
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UniTerm detects Data Carrier Detect thru polling bit 1 of the MFP 68901
IO port (Address $FFFA01), RI (Ring Indicator) is bit 6 (starting with
bit 0)..if you can think of something intelligent to do in a interrupt
handler, you can enable the corresponding MFP interrupt. A resonable
source for this kind of information (even if it does has errors) is
the Data Becker / Abacus book ST Internals, one good reason to buy it
(at least here) is the Bios/XBios listing in it...the latest edition
has a lot of errors corrected and is updated for ROM TOS.

                         Simon Poole