Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!ucsd!ucbvax!DBNUOR1.BITNET!SCHWIETZ
From: SCHWIETZ@DBNUOR1.BITNET (Edgar Schwietzke)
Newsgroups: comp.sys.atari.st
Subject: Input thru parallel port
Message-ID: <8910140702.AA02424@ucbvax.Berkeley.EDU>
Date: 14 Oct 89 07:02:28 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 16
X-Unparsable-Date: Fri, 13 Oct 89 13:22:44 MEZ

Could somebody please explain whether there is the risk of damaging
the soundchip when an output signal from a TTL-compatible (no tri-state
or open-collector) device is directly fed to the printer port?

As far as I know, the printer port is switched to output
mode during system initialization. Therefore, there is a good chance that
the port lines are tied to different voltage levels until the port
is explicitly switched to input mode.

I'm using a A/D converter directly connected to the printer port
without any problems so far. Nevertheless, I'd like to know what's
going on ...



Edgar