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       munch - munching squares screen hack

       munch  [-display  host:display.screen]  [-foreground  color] [-background color] [-window]
       [-root] [-mono] [-install] [-visual visual]  [-delay  seconds]  [-xor]  [-noxor]  [-shift]
       [-noshift] [-logminwidth minimum width]

       The  munch program preforms the munching squares hack until killed.  It picks square size,
       position, and gravity randomly; configurable options are listed below.

       The munching squares hack cosists of drawing Y = X XOR T for a range of X and T	over  and
       over  until all the possible combinations of X and T have come up.  It was reportedly dis-
       covered by Jackson Wright in 1962 and took 5 instructions of PDP-6 code.

       munch accepts the following options:

       -window Draw on a newly-created window.	This is the default.

       -root   Draw on the root window.

       -mono   If on a color display, pretend we're on a monochrome display.

	       Install a private colormap for the window.

       -visual visual
	       Specify which visual to use.  Legal values are the name of a visual class, or  the
	       id number (decimal or hex) of a specific visual.

       -delay seconds
	       How long to wait before starting over.  Default 5 seconds.

       -xor    Use the XOR drawing function.  (Default.)

       -no-xor Don't use the XOR drawing function.

       -shift  Start drawing the square at weird starting points.  (Default.)

	       Don't shift and start drawing the square at weird starting points.

       -logminwidth minimum-width
	       The  logarithm  (base 2) of the minimum with of a square (must be a power of 2, or
	       some parts of the square aren't.)

       DISPLAY to get the default host and display number.

	       to get the name of a resource file that overrides the global resources  stored  in
	       the RESOURCE_MANAGER property.

       X(1),	    xscreensaver(1),	    http://www.inwap.com/pdp10/hbaker/hakmem/hakmem.html,

       Quoted from HAKMEM, for historical interest.  As that  document	says,  "Unless	otherwise
       stated, all computer programs are in PDP-6/10 assembly language."

	       Another	simple display program. It is thought that this was discovered by Jackson
	       Wright on the RLE PDP-1 circa 1962.

		   DATAI 2
		   ADDB 1,2
		   ROTC 2,-22
		   XOR 1,2
		   JRST .-4
	       2=X, 3=Y. Try things like 1001002 in data switches.  This  also	does  interesting
	       things  with  operations  other	than XOR, and rotations other than -22. (Try IOR;
	       AND; TSC; FADR; FDV(!); ROT -14, -9, -20, ...)

       ITEM 147 (Schroeppel):
	       Munching squares is just views of the graph Y = X XOR T for consecutive values  of
	       T = time.

       ITEM 148 (Cohen, Beeler):
	       A  modification	to  munching  squares which reveals them in frozen states through
	       opening and closing curtains: insert FADR 2,1 before the XOR. Try data switches =

		   4000,,4    1000,,2002    2000,,4    0,,1002
	       (Notation: <left half>,,<right half>)

	       Also try the FADR after the XOR, switches = 1001,,1.

       Copyright (C) 1997 by Tim Showalter.  Permission to use,  copy,	modify,  distribute,  and
       sell  this  software  and its documentation for any purpose is hereby granted without fee,
       provided that the above copyright notice appear in all copies and that both that copyright
       notice  and this permission notice appear in supporting documentation.  No representations
       are made about the suitability of this software for any purpose.  It is provided  "as  is"
       without express or implied warranty.

       Tim  Showalter  <tjs@andrew.cmu.edu>,  17-Jun-97,  based  on what's in the Jargon File and
       stealing stuff from existing xscreensaver modules.

X Version 11				    17-Jun-97				  XScreenSaver(1)
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