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1996-10-14
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SVGA
An Image Viewing Utility
Version 1.02 - March 1992
Program Reference Manual
Copyright (C) 1992 by John P. Silva
All Rights Reserved
John P. Silva
3429 Maywood Dr.
Richmond, CA 94803 U.S.A.
(510) 222-9255
Internet: jsilva@cogsci.berkeley.edu
GE Mail: J.SILVA1
SVGA Version 1.02 Page 1 March 1992
TABLE OF CONTENTS
SVGA LICENSE INFORMATION 2
Shareware & Registration 2
Terms and Conditions 2
Limited Warranty 3
Limitation of Liability 3
Shareware Distributor License Agreement 3
Trademark Information 3
INTRODUCTION 4
Program Description 4
Features 4
Machine Requirements 4
Installation 4
USING SVGA 5
SVGA Command Line 5
SVGA Environment Variable 5
File Selection Screen 5
Getting Help 5
Moving Around 5
View Image 5
Change Directory 5
Change drive 6
Toggle 4DOS Description Display 6
Toggle Image Resolution Display 6
Toggle 43/50 Line Mode 6
Change Display Resolution 6
Get File Information 6
Edit 4DOS Description 6
Rename File 6
Delete File 6
Image Display Screen 6
Getting Help 6
Moving Around 6
Color Mix 6
Change Display Resolution 6
SVGA Version 1.02 Page 2 March 1992
SVGA LICENSE INFORMATION
Shareware & Registration
SVGA is Copyright (C) 1992 by John P. Silva. All Rights Reserved.
SVGA is SHAREWARE, user supported software for the IBM PC. SVGA is
made available for a free 30 day trial period. If you find this
program useful, you may license your copy of the program for use on
one machine by sending US$15 (see below) to:
John P. Silva
3429 Maywood Dr.
Richmond, CA 94803 U.S.A.
Terms and Conditions
SVGA is copyrighted software, and all rights are reserved. SVGA may
not be changed or modified in any way except by the author. SVGA is
SHAREWARE, and may be freely distributed, as long as it remains in
its complete form with all support and documentation files. It may
be used for a 30 day free trial period. Regardless of how the copy
is obtained, it is requested that all users comply with the
following licensing and registration provisions if they continue to
use it after the 30 day trial period:
You may license multiple copies of SVGA with discounts as follows:
1 - 10 copies US$15
11 - 50 copies 20% discount
51 - 100 copies 35% discount
101+ copies 50% discount
Site License US$750
All prices and discounts are subject to change without notice.
Discounts apply only to individual orders, they are not cumulative.
Registration entitles you to:
Use all updates at no cost.
Receive free updates by sending me a diskette and a self
addressed stamped disk mailer.
Receive free technical support either by phone (you call me)
or by letter.
SVGA should be distributed intact, with all executable and
documentation files.
A registered user may install SVGA on more than one machine,
provided he is the only user on each machine. The registration and
license policy is similar to a book, which can be taken with you but
used only by you.
SVGA Version 1.02 Page 4 March 1992
Limited Warranty
The author makes no warranty of any kind, either expressed or
implied. This includes, but is not limited to, implied warranties
of merchantability, and fitness for any particular purpose with
respect to both the software and the documentation included in this
package.
IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
CONSEQUENTIAL, OR INCIDENTAL DAMAGES ARISING OUT OF THE USE OR
INABILITY TO USE THIS PRODUCT EVEN IF THE AUTHOR HAS BEEN ADVISED OF
THE POSSIBILITY OF SUCH DAMAGES OR CLAIM. Some states do not allow
the exclusion or limitation of liability for consequential or
incidental damages, so the above limitation may not apply to you.
The warranties set forth above are in lieu of all other express and
implied warranties, whether oral, written, or implied, and the
remedies set forth above are your sole and exclusive remedies.
Limitation of Liability
In no case shall the authors liability exceed the license fees paid
for the right to use SVGA or five dollars (US$5.00), whichever is
greater.
Shareware Distributor License Agreement
Shareware distributors may distribute this program as long as the
Author has been notified prior to ANY distribution. The "per disk"
charge may not exceed $10 and the shareware distributor will not
change the above license agreement for the end user of SVGA. End
users are still required to register each shareware copy of SVGA.
Trademark Information
Graphics Interchange Format (C) Copyright CompuServe Incorporated.
GIF(sm) is a Service Mark owned by CompuServe Incorporated. For
further information, please contact:
CompuServe Incorporated, Graphics Technology Department,
5000 Arlington Center Boulevard, Columbus, Ohio 43220, USA
4DOS(tm) is a trademark of JP Software, Inc.
Other product and company names are trademarks of their respective
owners.
SVGA Version 1.02 Page 5 March 1992
INTRODUCTION
Program Description
SVGA is an easy to use multi-format image viewer designed to quickly
browse through a collection of image files.
Features
SVGA is a general purpose image file viewer for VGA and SuperVGA
with the following features:
* High speed viewing of the following image formats:
1. CompuServe GIF87a and limited GIF89a support. SVGA only
supports the image storage portion of GIF89a, not the
pseudo-animation and text extensions.
2. ZSoft PCX files (except 24 bit images).
3. MicroSoft Windows BMP files (except 24 bit images), both
compressed and uncompressed.
* Self configuring for most display boards using Ahead, ATI, C&T,
Everex, Genoa, NCR, Headland, Oak, Paradise, Trident, Tseng Labs
(ET3000/ET4000), Video 7, Western Digital, and Zymos VGA chips.
SVGA fully supports the VESA standard, and will use the VESA
standard (through BIOS or TSR support) if detected.
* SVGA can view images much larger than the available video hardware
may allow. This is accomplished by preloading the image and then
displaying in whichever mode the user desires. This allows the
display mode to be changed on the fly without having to reload the
image from disk.
* Will use all available main memory, EMS, XMS, and hard disk space
to view images up to 8192x8192 in size. If there is insufficient
real memory to load an image, SVGA will create temporary files on
disk as a virtual memory buffer to allow the image to be fully
loaded.
* Fully supports 4DOS compatible file descriptions, and can edit
file descriptions at the file display screen.
* Updates the display screen automatically when images are renamed,
deleted or descriptions changed.
* Can be compressed with PKLite or other executable file compressor
with no ill effects.
Machine Requirements
SVGA requires a VGA equipped IBM PC compatible computer with a
minimum of 384k of memory. 1MB of memory is desired for efficient
viewing of most image files.
Installation
Installation of SVGA is straightforward. Simply place the SVGA.EXE
executable someplace in the DOS path, and the rest is automatic.
SVGA requires no configuration or data files for correct operation.
SVGA Version 1.02 Page 6 March 1992
USING SVGA
SVGA Command Line
SVGA Command Line Format:
SVGA [/drb4] [/x xres] [/y yres] [/p startpath]
The /d option selects display of 4DOS descriptions at startup.
The /r option selects file list image resolution display at startup.
The /b option selects BIOS for screen I/O rather than direct screen
writes.
The /4 option selects 43/50 line mode at startup.
The /p option specifies the path SVGA should switch to at startup.
The /x and /y options specify the largest allowable display mode at
startup.
All command line switches are optional, and may be specified in
any order.
SVGA Environment Variable
Default command line switches may be specified in the dos
environment variable 'SVGA'. DOS environment variables are set by
giving a command to DOS before running SVGA. You can add these
commands to your AUTOEXEC.BAT file.
The format of the SVGA environment variable is identical to the SVGA
command line format. All command line options may be set in this
variable.
Example: set SVGA=/dr4 /x 800 /y 600 /p C:\GIF
These options select as default 4DOS descriptions, image resolution
display, 43/50 line mode, 800x600 startup resolution (or the largest
resolution available below 800x600), and a startup path of C:\GIF.
File Selection Screen
The File Selection Screen consists of the display mode list, the
file selection area, and the help line. The currently selected mode
is the mode displayed in yellow.
Getting Help
The F1 key will display the SVGA help and program information
screen.
Moving Around
You may position the cursor on the screen by using the arrow keys,
the HOME/END keys, the PGUP/PGDN keys, or by pressing the first
letter of the desired filename. HOME will move the cursor to the
start of the list. END will move the cursor to the end of the list.
PGUP will jump up one screenful of names. PGDN will jump down one
screenful.
View Image
To view an image, position the cursor to the desired image and press
the Enter key to initiate image display.
Change Directory
To change the current directory, position the cursor to the desired
directory and press the Enter key to select the directory. When
changing to the directory one level up, the cursor will be
positioned at the name of the previously selected directory.
SVGA Version 1.02 Page 6 March 1992
Change drive
The F2 key will bring up the drive selection dialog box. Simply
press the desired drive letter, and SVGA will attempt to change to
the desired drive. If an error occurs, SVGA will present an error
message and remain at the current drive.
Toggle 4DOS Description Display
The F5 key will toggle the display between multiple columns and 4DOS
descriptions. The default mode is multiple column display.
Toggle Image Resolution Display
The F6 key will toggle the display between file date/time and image
resolutions. The default mode is file date/time display.
Toggle 43/50 Line Mode
The F7 key will toggle between the startup mode and 43/50 line mode.
The default mode is usually 80x25 text mode. Certain utilities such
as UltraVision may change the default mode. SVGA fully supports the
large screen sizes provided by such utilities.
Change Display Resolution
The F9/F10 keys will decrease and increase the current mode,
respectively. The default mode is the mode with the highest
possible resolution.
Get File Information
Information on the current file can be obtained by pressing Alt-I.
This information is the same information that is found under various
aspects of the file display screen.
Edit 4DOS Description
4DOS descriptions can be edited by pressing Alt-E. Descriptions may
be edited whether or not descriptions are currently being displayed.
Rename File
The current file can be renamed by pressing Alt-R.
Delete File
The current file can be deleted by pressing Alt-D. This also
deletes the description in the 4DOS description file.
Image Display Screen
Getting Help
The '?' key will show available commands in Image Display Mode.
Moving Around
The arrow keys will scroll the image around the screen, if the
current image is larger than the current display mode. ESCAPE/Enter
will return to the File Selection Screen.
Color Mix
F1/F2 will decrease/increase the red content of the image.
F3/F4 will decrease/increase the green content of the image.
F5/F6 will decrease/increase the blue content of the image.
F7/F8 will darken/lighten the image.
Alt-F10 will return the palette to normal.
Change Display Resolution
F9/F10 will decrease/increase the current display mode.