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Article #9156Re: A/D converter ==> PC parallel port?
From: Jonathan L. Coburn
Date: Sat, 29 Dec 1990 01:40
Date: Sat, 29 Dec 1990 01:40
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Although the IBMPC parallel port is not designed to be bidirectional, it can read what it just wrote back out the port. The way it does this is by sampling the output latches on the data lines. Therefore, if you first write a 0 to the port and then put your data on the lines and do a read, you will get the data you want. You have to be careful not to pull or push too much current when you do this, but I have done it and it does work, kludgy though it may be. corwin
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cs.utexas.edu!yale!mintaka!ghoti!corwin From: corwin@ghoti.lcs.mit.edu (Jonathan L. Coburn) Newsgroups: sci.electronics Subject: Re: A/D converter ==> PC parallel port? Message-ID: <1990Dec29.014058.6072@mintaka.lcs.mit.edu> Date: 29 Dec 90 01:40:58 GMT References: <billq.661025394@s.ms.uky.edu> <857@valhalla.megatek.uucp> Sender: daemon@mintaka.lcs.mit.edu (Lucifer Maleficius) Distribution: sci.electronics Organization: MIT Laboratory for Computer Science Lines: 9