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VU.TXT
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1993-03-01
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│
The Silicon Frog, Inc. │
│
The VU Text File Viewer │
│
Version 1.0 │
│
(c) 1988-92 The Silicon Frog, Inc.
All Rights Reserved
Table of Contents
Introduction...............................................1
Memory Requirements........................................1
Screen Colors..............................................1
Extended Video Support.....................................1
Text Files.................................................1
Starting VU................................................2
The VU Screen..............................................2
Scrolling through the file.................................2
The Help/Status Line.......................................3
Loading a new file.........................................3
VU Text Viewer 1
Introduction
VU is a small, quick, and easy to use text file viewer
distributed with other Silicon Frog programs for your
convenience. In a nutshell, VU is an unreasonable
substitute for Vern Buerg's excellent LIST/LIST Enhanced
file viewer.
Memory Requirements
VU requires approximately 54K to operate. Although the
VU.COM file is barely 12K, the program requires over 40K of
dynamic DOS memory for its file buffer.
Screen Colors
VU operates on any standard display adapter. On a color
monitor, VU will display the text in white on blue, and its
title and help/status lines in inverse video. On a
monochrome monitor, the program displays the text in
standard video and the title and help/status lines in
inverse video.
Extended Video Support
VU passively supports adapter/monitor combinations and video
enhancers (e.g., Personics' UltraVision) which can display
more than 25 screen lines. Most recent video adapters
include utilities which allow you to switch video modes
(i.e., 80x43, 80x50, etc.) VU will not internally change
the existing text mode, but it will adapt to any mode as
long as the screen width is 80 columns.
Text Files
VU will accurately display standard CR/LF-delimited ASCII
text files such as Silicon Frog .DOC or .TXT documentation
files, .BAT files, Windows' .INI files, etc. You will get
unpredictable results if you attempt to view binary files or
most unformatted word processor document files (these files
seldom use CR/LF line delimiters). TAB characters, by
default, are shown as four contiguous spaces.
VU Text Viewer 2
Starting VU
To start VU, type the following command at the DOS prompt:
C:\>VU [D:\PATH\FILENAME.EXT] [/BW]
The filename parameter, if specified, must conform to DOS
coding standards. For example, if you do not specify a
path, the file must be in the current directory. You may
not use the ? and/or * DOS wildcards in the file name. If
you do not specify a file name when starting VU, the program
will prompt you for one. When the program is running, the
file name is shown at the right of the Help/Status line.
The /BW parameter tells VU to force monochrome operation.
Use this parameter if VU is unable to recognize your monitor
type or if the screen text is difficult to read (VU may not
be able to correctly identify monochrome monitors attached
to some EGA or VGA adapters).
The VU Screen
VU displays its name and copyright on the top screen line.
Summary help information is shown on the bottom Help/Status
line. File text occupies the area between the two.
Scrolling through the file
VU features horizontal scrolling to allow viewing of lines
which exceed the 80-character screen width. To scroll
through the file, use the following keys:
Key Action
----------------- ------------------------------------
<Up> Scroll up one line
<Dn> Scroll down one line
<PgUp> Scroll up one page
<PgDn> Scroll down one page
<Right> Scroll right 1 character
<Left> Scroll left 1 character
<Home> Top of file
<End> End of file
<Esc> Quit VU, return to DOS
VU Text Viewer 3
The Help/Status Line
The left half of the Help/Status line displays the program's
help reminders (scroll keys, <F2> to load a new file, <Esc>
to quit).
The right half of the Help/Status line displays the current
file status:
1. The line number (the line at the top of the file viewing
area), followed by the total number of lines in the file.
VU displays (TOF) and (EOF) indicators when you reach the
top or the end of the file.
2. The horizontal offset, expressed as a positive number.
This value is displayed only if you scrolled horizontally
and the first file position is no longer at the left edge
of the viewing area.
3. The file name and extension.
Loading a new file
To view a new file, press <F2>. VU will display a file name
prompt on the bottom line. The name of the file being
viewed, if any, will appear in the edit field. The
following keys are active while editing the file name:
Key Action
----------------- ------------------------------------
<Right Arrow> Move 1 character to the right
<Left Arrow> Move 1 character to the left
<Del> Delete character at cursor
<Backspace> Delete character at left of cursor
<Ins> Toggle Insert/Overstrike mode
<Alt><C> Clear field
<Alt><R> Restore original field
<Enter> Accept edit
<Esc> Cancel edit or Quit VU
If VU cannot find the file, it will display an error message
on the bottom line and will re-display the file prompt.
If the file prompt is displayed when the program starts
(i.e., you did not specify a file when you started VU),
pressing <Esc> will immediately terminate the program. If a
file is already loaded, pressing <Esc> cancels the new file
request and returns you to the file viewer.