📄 interfacing to the ibm-pc parallel printer port.htm
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<TD align=middle vAlign=top><FONT color=#eeeedd size=+2><B>Interfacing to
the<BR>IBM-PC Parallel Printer Port</B></FONT>
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<P>The original IBM-PC's Parallel Printer Port had a total of <FONT
color=#0000ff>12 digital outputs</FONT> and <FONT
color=#ff0000>5 digital inputs</FONT> accessed via 3 consecutive 8-bit
ports in the processor's I/O space.
<UL>
<LI><FONT color=#0000ff>8 output pins accessed via the <B>DATA Port</B></FONT>
<LI><FONT color=#ff0000>5 input pins (one inverted) accessed via the <B>STATUS
Port</B></FONT>
<LI><FONT color=#0000ff>4 output pins (three inverted) accessed via the
<B>CONTROL Port</B></FONT>
<LI><FONT color=#00a000>The remaining 8 pins are grounded</FONT> </LI></UL>
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<CENTER><IMG alt=" pinout diagram " height=229
src="Interfacing to the IBM-PC Parallel Printer Port_files/pinout.gif"
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<P><B>25-way Female D-Type Connector</B>
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<P>Various enhanced versions of the original specification have been introduced
over the years
<UL>
<LI>Bi-directional (PS/2)
<LI>Enhanced Parallel Port (EPP)
<LI>Extended Capability Port (ECP) </LI></UL>
<P>so now the original is commonly referred to as the
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<TD align=middle vAlign=top><FONT color=#eeeedd size=+1><B>Standard
Parallel Port (SPP)</B></FONT> </TD></TR></TBODY></TABLE>
<P><A href="http://www.doc.ic.ac.uk/~ih/doc/par/doc/intro.html">Introduction</A>
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