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1996-2009</I><P><H2>Index</H2><UL> <LI><A HREF="#intro">Introduction</A> <LI><A HREF="#circuithow">How to connect circuits to parallel port</A> <LI><A HREF="#doscontrol">Control program for DOS (and Win9x)</A> <LI><A HREF="#dosprogramming">Parallelport programming in DOS</A> <LI><A HREF="#windowsprogramming">Parallel port controlling in Windows programs</A> <LI><A HREF="#linuxprogramming">Parallel port controlling in Linux</A> <LI><A HREF="#webcontrol">Controlling parallel port through web</A> <LI><A HREF="#realworld">Controlling some real world electronics</A> <LI><A HREF="#relaycontrol">Building your own relay controlling circuits</A> <LI><A HREF="#mainspower">Mains power controlling with parallel port</A> <LI><A HREF="#multiout">Compact 8 channel output driver</A> <LI><A HREF="#circuitlinks">Links to parallel port output circuits</A> <LI><A HREF="#controlsoftware">Ready made control software</A> <LI><A HREF="#input">Reading the input pins in parallel port input pins</A> <LI><A HREF="#registers">Parallel port software registers technical summary</A> <LI><A HREF="#bootupnotes">Notes on parallel port operation during computer boot-up</A> <LI><A HREF="#portversions">Notes on different parallel port versions</A> <LI><A HREF="#pcibus">Notes on PCI bus parallel port cards</A> <LI><A HREF="#usbnotes">Notes on USB parallel port adapters</A> <LI><A HREF="#documentlinks">Other documents worth to check</A></UL><P><H2><A NAME="intro">Introduction</A></H2><P>PC parallel port can be very useful I/O channel for connecting yourown circuits to PC. The PC's parallel port can be used to perform some very amusing hardware interfacing experiments. The port is very easy to use when you first understand some basic tricks. This document tries to show those tricks in easy to understand way.<P><B>WARNING: PC parallel port can be damaged quite easily if you make mistakesin the circuits you connect to it. If the parallel port is integrated to themotherboard (like in many new computers) repairing damaged parallel portmay be expensive (in many cases it it is cheaper to replace the wholemotherborard than repair that port).</B>Safest bet is to buy an inexpensive I/O card whichhas an extra parallel port and use it for your experiment. If you manageto damage the parallel port on that card, replacing it is easy and inexpensive.<P>NOTE: The I/O port level controlling details here has proven to work well with parallel ports on the PC motherboard and expansion cards connected to ISA bus. The programming examples might not work with PCI bus based I/O cards (they can use different hardware and/or I/O addresses, their drivers make they just look like parallel ports to "normal" applications). The programming examples do not work with USB to parallel port adapters (they use entirely different hardware, their drivers make them to look like normal parallel port to operating system "normal" applications).<P><B>DISCLAIMER:Every reasonable care has been taken in producing this information.However, the author can accept no responsibility for any effect that thisinformation has on your equipment or any results of the use of thisinformation. It is the responsibly of the end user to determine fitnessfor use for any particular purpose.The circuits and software shown here are for non commercial use withoutconsent from the author. </B><P><H2><A NAME="circuithow">How to connect circuits to parallel port</A></H2><P>PC parallel port is 25 pin D-shaped female connector in the back of thecomputer. It is normally used for connecting computer to printer, but manyother types of hardware for that port is available today.<P>Not all 25 are needed always. Usually you can easily do with only 8output pins (data lines) and signal ground. I have presented thosepins in the table below. Those output pins are adequate for many purposes.<P><PRE>pin function 2 D0 3 D1 4 D2 5 D3 6 D4⌨️ 快捷键说明
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