Article View: sci.electronics
Article #5100Re: Is PC parallel port latched?
From: Greg Ebert
Date: Mon, 16 Jul 1990 15:30
Date: Mon, 16 Jul 1990 15:30
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In article <33965@ut-emx.UUCP> ycy@walt.cc.utexas.edu (Joseph Yip) writes: >Hi, > >I am trying to use IBM PC's parallel port (printer port) as digital >output port. This will save me from buying a digital I/O card. Yes, the parallel port uses a latched output driver, usually a 74xx373. It also has readback, so if you write to the port you can read-back whatever was written. The I/O address is either 278h, 378h, or 3BCh. Use DEBUG to find it, or look at 40:0 for the pointers. If you are only using the 8 data lines, you don't need to worry about the status/control lines.
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arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!rice!uw-beaver!zephyr.ens.tek.com!gvgpsa!gold!gregeReferences:
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!rice!uw-beaver!zephyr.ens.tek.com!gvgpsa!gold!grege From: grege@gold.GVG.TEK.COM (Greg Ebert) Newsgroups: sci.electronics Subject: Re: Is PC parallel port latched? Message-ID: <1170@gold.GVG.TEK.COM> Date: 16 Jul 90 15:30:55 GMT References: <33965@ut-emx.UUCP> Organization: Grass Valley Group, Grass Valley, CA Lines: 13