COMMENT ⊗   VALID 00002 PAGES
C REC  PAGE   DESCRIPTION
C00001 00001
C00002 00002	DVIDD is a program to display the contents of a DVI file (the output of TeX)
C00010 ENDMK
C⊗;
DVIDD is a program to display the contents of a DVI file (the output of TeX)
on a Data Disc screen.	To run the program, say

	.r dvidd;filename

where "filename" is the name of your DVI file (extension ".DVI" is optional).
The following optional switches may be used in the command line, after the
filename:

	/nP	Begin displaying at page n
	/M	Use the magnification in the DVI file
	/-M	Use 1440 instead of the magnification in the DVI file
		(this is currently the default setting)
	/nM	Use n instead of the magnification in the DVI file
	/-F	Do not use preloaded fonts (see below)
	/-B	Do not draw boxes around characters whose dimensions
		are read from .TFM files (see below)
	/-G	Do not show gray rectangles for characters whose dimensions
		are read from .TFM files (see below)

The DVI file may contain graphics commands produced by \special control
sequences in TeX.  For the format of these commands, see DVIDOV.IAZ[UP,DOC].
All of the textured rectangle commands (including those not accepted by
DVIdover) are allowed.	The "pen size" parameter in \special{join} commands
is limited only by the DataDisc resolution; there is nothing special about the
8 values mentioned in DVIDOV.IAZ.

DVIDD now reads fonts in "GF" format and if the desired file cannot be
found it then reverts to using the older "PXL" font files. The loading of
GF fonts is signalled by printing a series of periods after the statement
"Reading fonts" and by asterisks when PXL files are used. The default
areas for these files are [GF,SYS] and [PXL.SYS].  When GF fonts are
found and used, they may contain as many as 256 glyphs.

GF font files are being rapidly genetrated in the desired magnifications
and the use of the older PXL files will probable decline.

If your document uses a magnification other than 1.44, the program will
show it at magnification 1.44 anyway, unless you use the "/M" switch
(above).  If this causes the pages to be too wide for the screen, use the
← and → commands to move around and see everything.

AM fonts corresponding to those used by LaTeX in various point sizes also exist.

If a font requested in the DVI file does not exist, the program will search for
a TFM file instead.  If this is found, then the characters will be shown as gray
rectangles whose dimensions reflect the information in the TFM file.  The default
is to outline the rectangles with boxes, but the /-B switch suppresses the boxes
and the /-G switch suppresses the gray interiors.  The characters will not appear
at all if both switches are given.

If for any font, there is neither a GF file, nor a PXL file nor a TFM file,
then DVIDD will not proceed.

Certain fonts are "preloaded", which means that the program already has all the
information in the GF files for those fonts.  If the preloaded fonts get out of
date, DVIDD usually detects the problem by comparing checksums; in this case,
the font file is reread and an "!" is printed.  If for some reason you want to
disable the use of preloaded fonts, put the /-F switch after the name of the DVI
file.  (If you are using such a high magnification that DVIDD runs out of memory,
the /-F switch might help.)

While running the program, you may use the following commands (where "n" is
any string of digits):

	<form>	Go forward (about 3/4 of a screenful)
	#<form> Go forward # windowfuls
	0<form> Go forward 1/2 window
	α<form> Go forward, changing pages if necessary
	<vt>	Go back
	#<vt>	Go back # windowfuls
	0<vt>	Go back 1/2 window
	α<vt>	Go back, changing pages if necessary
	←	Move text left (about 3/4 of a screenful)
	→	Move text right (about 3/4 of a screenful)
	`	Move text left (about 1/16 of a screenful)
	'	Move text right (about 1/16 of a screenful)
	B	Glitch screen up from bottom
	#B	Glitch sceen up # times from bottom
	E	Exit from the program
	L	Go to the top of the page
	∞L	Go to the bottom of the page
	#L	Show portion of page including the #% point
	P	Go to the next page
	+P	Go to the next page
	-P	Go to the previous page
	#P	Go to page #
	+#P	Go forward # pages
	-#P	Go back # pages
	T	Glitch screen down from top
	#T	Glitch screen down # times from top
	V	Refresh display
	βV	Clear and refresh display
	<alt>	Abort partially typed command
	ε	Edit a file with E
	λ	Edit a file with E, readonly mode
	}	Run DVIdover to print the current file
	β}	Create DVIdover command line but don't run it 
	#	Run DVIrover to print the current file
	β#	Create DVIrover command line but don't run it 
	π	Run BOISE to print current file 
	βπ	Create BOISE command line but don't run it 
	@	Run DVIesp to prin curren file
	β@	Create DVIesp command line but don't run it
	?	Display partial list of commands 

<Control> and <meta> are optional, except where shown as α and β.  
<Control> is not allowed for the "}" and "π" commands.

This set of commands has been made to resemble the syntax of E as much 
as possible.