/usr/lib/pd/extra/zexy/lp-help.pd is in pd-zexy 2.2.6-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#X text 129 36 write data to the (parallel) port;
#X floatatom 81 304 4 0 255 0 - - -;
#X text 122 304 write an 8bit-word;
#X obj 90 33 lpt;
#X text 521 30 part of zexy;
#X text 79 64 this does not work on osX (as there is no parallel port)
;
#N canvas 4 49 631 406 windows 0;
#X text 32 16 To get it running under WinNT/2000/XP a special kernel
driver is needed. These systems do not allow direct access to I/O ports.
;
#X text 53 207 If you ever whish to remove the kernel driver start
the programm again and click 'Stop'.;
#X text 54 242 Under Win95/98/Me all this is not needed!!!;
#X text 52 272 Good Luck!;
#X text 54 141 The subfolder 'UserPort' contains a kernel driver that
handles the I/O stuff. Just copy the file UserPort.sys into %WINDIR%/system32/drivers
(e.g. C:/WinNT/system32/drivers) and run the program UserPort.exe.
Click on 'Start' and then 'Exit'.;
#X text 175 112 ftp://iem.at/DOSen/UserPort/;
#X text 172 82 http://www.embeddedtronics.com/public/Electronics/minidaq/..
../userport;
#X text 49 79 downloads:;
#X text 267 326 thanks to Olaf Matthes for this;
#X restore 292 86 pd windows;
#X text 80 253 you should be member of the "lp" group or set the the
permissions of the device file;
#X obj 81 477 lpt /dev/parport0;
#N canvas 4 49 553 385 raw 0;
#X text 24 127 if your port-address exceeds 0x3ff \, "lpt" will try
to get all permissions with the iopl()-command. this might be dangerous
!;
#X text 26 50 you can access all ports on your system when using "lpt
<hex-port-address>";
#X text 26 89 you might have to be root (superuser) \, in order to
gain raw access to the port.;
#X text 75 230 parallel ports 0 \, 1 \, 2;
#X obj 81 251 lpt 0;
#X obj 130 251 lpt 1;
#X obj 179 251 lpt 2;
#X obj 68 329 lpt 0x378;
#X text 63 308 another port (directly specifying the port address)
;
#X restore 460 150 pd raw access;
#X text 78 86 w32 users shoud read this:;
#X text 81 153 linux users can use the deprecated RAW access method
;
#X text 80 219 you can access your parallel ports by accessing /dev/parport0
(and similar);
#X text 82 189 the preferred way for linux users is to use the device-filesystem:
;
#X text 217 478 <-- access /dev/parport0;
#X obj 84 545 lpt /dev/parports/0;
#X text 222 546 <-- some systems might use this syntax;
#X msg 335 309 control \$1;
#X floatatom 335 291 4 0 255 0 - - -;
#X floatatom 81 509 5 0 0 0 - - -;
#X msg 337 433 bang;
#X text 380 437 read the input bits;
#X text 131 509 input bits;
#N canvas 461 150 494 344 META 0;
#X text 12 145 HELP_PATCH_AUTHORS "pd meta" information added by Jonathan
Wilkes for Pd version 0.42.;
#X text 12 25 LICENSE GPL v2;
#X text 12 125 AUTHOR IOhannes m zmoelnig;
#X text 12 45 DESCRIPTION write data to the (parallel) port;
#X text 12 65 INLET_0 float bang control;
#X text 12 105 OUTLET_0 float;
#X text 12 5 KEYWORDS control hardware interfacing;
#X text 12 85 INLET_1 float;
#X restore 571 557 pd META;
#X floatatom 335 361 4 0 255 0 - - -;
#X text 373 361 alternative way to set control bits;
#X text 373 291 set control bits;
#X connect 1 0 8 0;
#X connect 8 0 19 0;
#X connect 17 0 8 0;
#X connect 18 0 17 0;
#X connect 20 0 8 0;
#X connect 24 0 8 1;
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