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1991-03-12
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=================
C o m p u S h o w
=================
Standard Version 8.24a
for the
IBM PC, XT, AT, PCjr, PS/2 (and compatibles)
with
Hercules Monochrome Graphics Adapter
or
Color Graphics Adapter (CGA)
or
Enhanced Graphics Adapter (EGA)
or
Multi-Color Graphics Array (MCGA)
or
Video Graphics Array (VGA)
Installing CompuShow
====================
The CompuShow program(s) have been compressed using PkLite. Do not attempt to
compress them again using PkLite, LzExe or a similar utility. If you received
CompuShow on a floppy disk, install it as described below and set the
original floppy aside (don't run ANY SOFTWARE on an original "master disk";
install it on a hard disk or a "working copy floppy disk", first.) If you
downloaded CompuShow using a modem, copy the downloaded file to a backup
floppy before proceeding.
Installing on a floppy disk
---------------------------
Install CompuShow on a floppy disk by copying the CompuShow files to a
formatted disk. For example, "COPY A:*.* B:" will copy all files from a disk
in drive A: to a disk in drive B:. Once you've started CompuShow, you can
remove the program disk in order to mount other disks containing graphics
(and press Alt-A or Alt-B to display the file directory of a new disk in
drive A: or B:).
Installing on a hard disk
-------------------------
Install CompuShow on a hard disk by placing the files in a separate hard disk
sub-directory. For example, to place CompuShow on hard disk drive C:
C:
MD CSHOW
CD CSHOW
COPY A:*.*
Page 1
In order to be able to execute CompuShow "from anywhere" (even when you're
not logged to the CSHOW sub-directory on drive C:), you can do one of two
things:
1) add "C:\CSHOW" to the "PATH" statement in AUTOEXEC.BAT
2) use a batch file (on the path) to execute CompuShow.
We recommend the second method, so create a batch file in a sub-directory
that's already included in the path statement of AUTOEXEC.BAT. For example,
at your DOS prompt, execute the PATH command without any parameters to find
out what the current setting is:
PATH <-- you type this
PATH=C:\PROGRAMS;C:\BATS;C:\DOS <-- DOS responds
(If the PATH command indicates that you don't have a PATH set, you really
should check your DOS manual to read about the advantages of setting a path
in AUTOEXEC.BAT). Select an appropriate sub-directory (such as C:\BATS) and
create a batch file to execute CompuShow:
(DOS version 3 and above):
C:
CD \BATS
COPY CON CSHOW.BAT
C:\CSHOW\CSHOW %1 %2 %3 %4 %5 %6 %7 %8 %9^Z
(DOS below version 3):
C:
CD \BATS
COPY CON CSHOW.BAT
C:
CD \CSHOW
CSHOW %1 %2 %3 %4 %5 %6 %7 %8 %9^Z
(The ^Z above means hold down the CTRL key and type Z). The purpose of "%1"
through "%9" is to allow you to pass command-line arguments to the program
through the batch file. Execute "CSHOW" at your DOS prompt and the batch file
is executed to load CompuShow no matter "where you are".
CompuShow requires at least 221k of available memory (depending on the
"start-up options" specified.) If the program displays an "Insufficient
memory" message, you need to make more memory available. (Remove some memory-
resident programs, for example.)
Start-Up Options
================
"Command-line switches" let you control graphics video features and the way
that the program allocates memory for various purposes.
Page 2
Video Hardware Identification
-----------------------------
CompuShow should recognize the type of video adapter present in your computer
(Hercules, CGA, EGA, MCGA, or VGA). In case the detect routine fails to
identify the correct adapter, a command-line switch will override the
automatic routine:
>CShow +H (or +h) force Hercules mode
>CShow +C (or +c) force CGA mode
>CShow +E (or +e) force EGA mode
>CShow +B (or +b) force EGA (monochrome monitor) mode
>CShow +M (or +m) force MCGA mode
>CShow +V (or +v) force VGA mode
"Super-Ega"
-----------
A "/" switch is used to indicate the presence of a 480 line "Super-EGA"
adapter. The program knows about several:
>CShow /A ( or /a ) Ahead Systems
>CShow /G ( or /g ) Genoa
>CShow /P ( or /p ) Paradise AutoSwitch EGA-480
>CShow /T ( or /t ) Tseng
>CShow /V ( or /v ) "VGA" (eg. the Zenith "VGA")
These commands specify graphics modes 38, 115, 80, 37, and 18 respectively,
which puts each card in 480 line EGA mode. Other 480 line cards may be
identified by supplying the (decimal) graphics mode number, for example:
>CShow /71 to use mode 71 for 640x480 EGA
Hardware-Specific Video Drivers:
--------------------------------
CompuShow uses "video drivers" to support extended graphics modes on a wide
variety of video hardware. With the standard (version 8.24a) program, the
video drivers are included as separate disk files, named "videoP1.drv",
"videoI4.drv", etc. The "+S" command-line switch tells the program to load a
specific video driver, for example:
>CShow +sP1
loads the "P1" video driver ("videoP1.drv").
To set up a video driver to be loaded automatically whenever the program is
started:
>copy videoP1.drv video.drv
With no "+S" switch specified, the program will load file "VIDEO.DRV".
NOTE: See the "Video Driver Modes" section of this document, which describes
how you can tell CompuShow which modes work with your video card and monitor.
Once you set up VIDEO.DAT, CompuShow will consider video driver modes when
selecting the "best mode" for display with the spacebar.
Page 3
With the enhanced (version 8.24b) program, the video (and printer) drivers
are "built in to" and selected with the System Configuration program CSHOWI.
When you select a video driver with the CSHOWI program, it creates VIDEO.DAT
and VIDEO.DRV, which are loaded automatically at program start-up.
+-------------------------------------------------------------------------+
| FOR A COMPLETE, UP-TO-DATE LISTING OF THE VIDEO DRIVERS, SEE README.DOC |
+-------------------------------------------------------------------------+
Optional Features
-----------------
A "#" switch is used to specify optional features:
>CShow #E ( or #e ) DISABLES horizontal EGA panning
Some EGA adapters have trouble with horizontal panning. If your EGA display
is "scrambled", use the #E switch.
>CShow #J ( or #j ) ENABLES PCjr/Tandy-1000 video modes
The program will reserve 32k of memory required for these special video
modes. (Without this switch, the memory is available for the program to use
for other purposes.)
>CShow #MS ( or #ms ) allocate MEMORY for a SMALL buffer
>CShow #MM ( or #mm ) allocate MEMORY for a MEDIUM buffer
>CShow #ML ( or #ml ) allocate MEMORY for a LARGE buffer
This option lets you control the amount of memory that the program reserves
for reading the graphics file. The small buffer is 2k, the medium buffer is
32k, and the large buffer is 62k. A small (2k) buffer is the default. (The
size of the read buffer DOES NOT determine the maximum size file that the
program can display: a 45k file requires 23 reads with a 2k buffer, 2 reads
with a 32k buffer, and 1 read with a 62k buffer.)
>CShow #D300
This option lets you control the amount of memory reserved for the file
directory. The "default" is 120 files. You may specify any number from 0 to
9999.
>CShow #Q
Turns off the sounds that the program makes (Quiet).
>CShow #B
If you have a laptop or any computer with an LCD screen, this option will
provide "readable colors" (gray and black).
>CShow #L
This one's for Leading Edge "IBM compatible" computers. If the CompuShow
screen goes blank on your Leading Edge, use "#L".
Page 4
Missing files
-------------
The CompuShow "package" includes the program, documentation files, video
drivers, etc. When CompuShow starts, it checks to see that all its files are
present and displays a "missing files" message for 15 seconds if any are
missing. If you have a copy of the original disk or archive including all
these files, you don't need to keep them on your "working floppy" or hard
disk:
- Install CompuShow to a "working copy floppy disk" or hard disk
sub-directory, as described above. (Remember to set aside the original
"master disk" or backup copy of your download.)
- Execute CSHOW. With all files present, it will create CSHOW.DAT
- Execute CSHOWDEL to delete the documentation and video drivers (and
CSHOWDEL.BAT, so a "batch file missing" message is normal.)
Please remember that you MUST INCLUDE ALL FILES when you pass CompuShow on to
a friend, or post it on a BBS.
Dual Monitor Operation
======================
On a system with both a monochrome and color graphics (CGA, EGA, VGA, etc.)
adapter installed, start the program on the monochrome monitor to operate in
dual monitor mode. The directory screen will appear on the monochrome
monitor, and graphics images on the color graphics monitor.
When you finish displaying a graphic, press <Carriage Return> to leave the
graphic image on screen, or <ESCape> to clear the graphics screen.
[F1] for Help
=============
Press the [F1] function key to pop up a quick-reference Help Screen with a
brief description of the options available.
[Shift-F1] for Information
==========================
Hold a shift key and press the [F1] function key to pop up a Program
Information box, which identifies the options you've specified and the amount
of memory used by the program for various purposes. Several of the start-up
options control the way the program allocates memory. This is important for
several reasons.
- The amount of Display Memory determines the extents for panning images,
and can affect the operation of transparency and "restore to previous"
functions.
The (default) small read buffer provides the most memory for a large
virtual screen. If you specify a larger read buffer (eg. with the "#MM" or
"#ML" command line switch), you take memory away from the virtual screen.
Page 5
- If you have a lot of files in the directory, and the program needs memory
to pop up a box, it will have to "abandon" the sorted file list. When you
return to the directory screen, the program will retrieve, sort, and re-
display the directory, and you will be placed at the first file on the
first screen.
The "#D" option lets you reserve memory for a directory of up to 9999
files, so that the program won't have to "abandon" it to pop up boxes.
Keep in mind that reserving memory for a large directory leaves less
memory for the virtual screen.
Changing the directory display
==============================
The program automatically selects a format to display as many files as
possible on each screen. If you have more than one screen of files, press
PgDn/PgUp to view the next/previous directory screen.
- At the input area, you may change to a different disk drive by typing the
drive designation and pressing the [F2] key. For example, type "A:" and
press [F2] to switch to drive A:.
You may also change to a different sub-directory. Type the sub-directory
name in the input area and press [F2]. The sub-directory specification can
be any form acceptable in a DOS "ChDir" command, such as "\" or
"..\..\OTHER". You can also combine a drive and sub-directory change, such
as "B:\PICS".
Press [Shift-F2] to change to your "original" (drive and) sub-directory;
where you were when you started CompuShow.
Press [Ctrl-F2] to change to the (drive and) sub-directory containing the
CompuShow program.
Press [Alt-F2] to change to the "start-up" (drive and) sub-directory that
you installed with CShowI (with the enhanced program.)
Press [Alt-A] or [Alt-B] to change to drive A: or B:.
- Press [F3] to "toggle" between the compressed directory display (4 or 6
columns) and a wide directory display (two columns, including file name,
size, date, and time.)
- Enter a directory mask and press [F4]. Type "*.GIF" and press [F4] to limit
the directory display to all files with a ".GIF" file name extension. Press
[F4] with a blank mask to reset the directory mask to "*.*".
- Press [F5] to pop up a directory sort box:
- Press "C" for a Complete directory display with the volume label, hidden
files and sub-directories, including "." (this sub-directory) and ".."
(the directory "above"). Press "O" to display Only files.
- Press "U", "N", "E", "S", or "D" for Unsorted (DOS sequence) or to sort
the directory on Name, Extension, Size, or Date.
Page 6
- Press "F" or "B" for Forward (ascending) or Backward (descending)
sequence.
- Press carriage return when you're done.
Selecting a file to display
===========================
Method 1: Enter the name of the file
------------------------------------
Type the name of any file and press <Carriage Return> to select it. Note that
you may use this method to specify a file that's not in the displayed file
list. (You may need to include the drive and subdirectory, as in
"c:\pics\special\hidden\other.gif"). When you press <Carriage Return>, the
file will be retrieved, or a "beep" will sound if it was not found.
Method 2: Selecting from the directory list
-------------------------------------------
Press the "up arrow" cursor key to move into the directory display, then:
- "Down arrow" ("Up arrow") moves you to the next (previous) file.
- At the last (first) file on the screen, you move to the next
(previous) screen, if there is one.
- Ctrl-PgDn (Ctrl-PgUp) moves you to the bottom (top) of the column.
- Ctrl-End (Ctrl-Home) moves you to the last (first) file on the screen.
- PgDn (PgUp) moves you to the next (previous) screen.
- End (Home) moves you immediately to the last (first) file.
- A letter key (A..Z) moves you to the next file starting with that letter.
(Type "A" repeatedly to move to each file starting with "A".)
When you find a graphic that you want to display, press the SpaceBar to
display it immediately, or <Carriage Return> to pop up the Graphics
Information Box.
Press ESCape to return the cursor to the input area.
Directory "Goodies"
===================
ChDir At a sub-directory (identified by <DIR>), press <Carriage Return> to
change to that sub-directory. Sub-directories are displayed when you
select "C"omplete in the [F5] directory sort box. Remember that "." is
"this directory" (so nothing happens when you attempt to change to
"."), and ".." is "the directory above".
DEL Press Alt-D to delete the current file. (You must confirm a delete by
responding "Y".)
Page 7
REN Press Alt-R to REName the current file. Enter a new name for the file,
or press ESCape (or just leave it blank and press <carriage return>)
to change your mind about renaming it.
COPY Press Alt-C to copy the current file. Enter the "destination" file
name, or press ESCape (or just leave it blank and press <carriage
return>) to change your mind about copying it.
NOTE: While parallel to the DOS commands "REN" and "COPY", these functions
are different in one important respect. You can't use any "short-cuts", such
as "?" or "*" wildcards for Alt-R and Alt-C, or "destination only" for Alt-C:
Valid DOS command CShow function
---------------------- -------------------------
REN NUMBER1.GIF N1.* Alt-R (name>) N1.GIF (N1.* won't work)
COPY NUMBER1.GIF N1.* Alt-C (name>) N1.GIF (N1.* won't work)
COPY NUMBER2.GIF B: Alt-C (name>) B:NUMBER2.GIF (B: won't work)
The Graphics Information Box
============================
When you press the SpaceBar while in the file directory area, the graphic is
displayed immediately in the best available display mode. If, instead, you
press <Carriage Return>, the Graphics Information Box pops up.
The top line of the box identifies the type of graphic file, and any other
information available, such as "version", width, height, and number of colors
in the graphic.
Monochrome graphics (CompuServe RLE and MacPaint) have a simple Graphics
Information Box, with a single display option. To display the graphic, press
"1" or the spacebar.
Color graphics (CompuServe GIF, PC Paint, PC Paintbrush, Dr. Halo, ColoRix,
etc.) have up to 40 display modes listed; for example "EGA 5=320x200x16":
- You may have Hercules, CGA, PCjr/Tandy, EGA, MCGA, VGA, "extended VGA"
and video driver modes available, based on the type of video adapter,
start-up options, and the video driver you've loaded.
- The "5" will appear in a bright text color if it's "recommended" or in a
dim color if the graphic is larger than the screen, or has more colors.
- The "=" indicates that this is a "true" graphic mode. A ":" indicates a
simulated mode.
- "320x200x16" means that the screen is 320 "pixels" (dots) wide by 200
pixels high in 16 colors.
To display a color graphic, press the key ("5" in the above example), or
press the spacebar to have the program choose the "best available mode".
RLE Graphics
============
The RLE format supports "Medium" (128x96) and "High" (256x192) resolution
monochrome graphics. While the RLE image is displayed:
Page 8
- Press "N" (or Alt-N) to Negate the image. Some RLE images
(radar/weather maps, for example) should be "negated", which reverses
black and white, before printing. Without negating, you would print a
black page with white lines.
- With the enhanced program, you may print the image by pressing "P"
(or ^P).
MacPaint Images
===============
The information box indicates the number of rows in the MacPaint image. Each
image is 576 wide, and a maximum of 720 long. MacPaint images are usually
longer than the physical screen. During display:
- The up and down arrow keys "auto-pan", so that the image moves slowly
up or down the screen until the top or bottom is reached, or until a
key is pressed to stop the "auto-pan."
- Home and End jump immediately to the top and bottom.
- Press "N" (or Alt-N) to negate the image.
- On an EGA or VGA, press "C" during the display to "colorize" the
image. The 576x720 image is compressed to 288x360, and displayed with
shades of reds and browns in place of the black and white image. The
[F1]..[F10] function keys allow you to select any of ten different
pre-defined color palettes.
Press any key to remove the colorized image.
- With the enhanced program you may print the MacPaint image by
pressing "P" (or ^P).
CompuServe GIF Graphics
=======================
The information box for a GIF (pronounced "JIF") graphics file indicates the
GIF signature and version. CompuShow supports GIF versions "87a" and "89a".
If the GIF file is an unknown (future) version, you will hear a "buzzer"
sound, and the GIF version will blink. The width, height, and number of
colors in the image are also shown.
During display, if there's an error in the GIF file, the program will make a
"buzzer" sound as the error is encountered. When you return to the GIF
information box, the error description and location are shown on the top
line:
Version: GIF87a, 320x200x256 Error: End Of File at 36050 [00]
The possible errors are: Bad Block ID, Bad MinCode, End of File, Bad Code,
Invalid Image, Interlace Overrun, and Sequential Overrun. In all cases, an
error indicates that the GIF file is damaged (perhaps in downloading), or was
incorrectly encoded in the first place.
With the release of GIF version 89a (July '90) several exciting new features
are supported:
Page 9
- Text may be included for display with the graphic. On an EGA or VGA
system, CompuShow uses a text font "built-in" to the adapter. On any other
adapter, the program uses the character fonts in the file FONTS.DRV.
- A "user input" request causes CompuShow to wait for you to press a key
before continuing, to allow you time to read text, etc. To indicate that
it's waiting for your keypress, the program sounds a "click". Press any
key to proceed (ESCape will interrupt further processing.)
- Delays between images may be used for animation or to allow time for you
to read text. Delays are also usually associated with any user input, so
that the program can continue after you've pressed a key or the delay time
has expired.
- Transparency may be used to create non-rectangular images (or text
characters) to appear "on top of" the underlying image.
- Images may appear which are "disposed of" by restoring to either the
background color or the previous (underlying) image.
- Comments may be included by the person creating the GIF. After you've
viewed a GIF with comments, you're asked whether you want to read them.
As a rule of thumb, transparency and restore to previous functions in a
640x480x256 GIF will require a 640k system, with no RAM resident programs
loaded (TSRs, RAM disks, etc.), so that at least 530k of memory is available
to CompuShow. If there isn't enough memory available, the transparent color
will be displayed, and restore to previous will be handled as a restore to
background.
+-------------------------------------------------------------------------+
| See README.DOC for information about "CompuMake Tools" for converting |
| your existing graphics images to GIF, including support for all |
| features of the GIF89a format. |
+-------------------------------------------------------------------------+
PC Paintbrush
=============
The information box for a PC Paintbrush PCX file indicates the version, size
and number of colors. CompuShow supports PC Paintbrush version 2.5, 2.8
(including external 256 color palette ".PAL" file), and 3.0 graphics in
2 to 256 colors.
PC Paint
========
The information box for a PC Paint PIC file indicates the size, colors and
"mode". CompuShow displays mode "G" and "L" graphics with 16 or 256 colors.
Note that PC Paint graphics are displayed starting at the bottom, so if the
graphic is larger than the screen, it may appear that nothing is happening
until you reach the point where the row is on screen.
Page 10
Dr. Halo
========
The information box for a Dr. Halo PIC file indicates the version, size and
number of colors. CompuShow supports Dr. Halo versions 2 and 3, and a number
of formats including 320x200x4, 320x200x16, 640x350x16, 720x348x2 and
720x348x16.
RIX ColoRix and Ega Paint
=========================
The information box for a ColoRix "SCx" file indicates the size and number of
colors. CompuShow supports uncompressed ColoRix files in a wide range of
sizes and 256 colors.
Ega Paint images are 640x350x16 colors.
Targa
=====
Targa 16, 24, or 32 bit, uncompressed or run-length-encoded, mapped or RGB
images may be displayed. (Targa type 1, 2, 9, and 10.)
Deluxe Paint
============
Deluxe Paint II and Deluxe Paint II Enhanced "LBM" (and "BBM", etc.)
Color Graphic Display
=====================
To display any color graphic (GIF, PC Paintbrush, PC Paint, Targa, etc.):
- Type any character listed in the Information Box to display the graphic in
that mode, or
- Press the spacebar to have the program select the "best mode" (the
character it will use is displayed at the cursor), based on the size and
number of colors in the graphic. To tell the program to consider video
driver modes when selecting the best display mode, see "Video driver
modes", below.
As the image is being displayed, press ESCape or Ctrl-C to interrupt (and
abort) display of the rest of the image. (The partial image will remain
on the screen. Type <Carriage Return> to return to the information box.)
While the image is displayed:
- Images larger than the PHYSICAL SCREEN can be "panned", using the up,
down, left and right cursor arrow keys. Press a key (once) to pan in
that direction. Panning will stop at the end of the image, or may be
interrupted by pressing any key. In addition:
Home/End jump to the upper-left/lower-right corner,
Ctrl-Lft/Ctrl-Rgt jump "one screen width" Left/Right,
Ctrl-Home/Ctrl-End jump "one screen height" Up/Down.
Page 11
- The EGA/VGA display pans both vertically and horizontally, and can
accommodate 16 color images up to 320x1638, 640x819, or 1024x512.
- Other display modes (including hardware-specific modes) pan both
vertically and horizontally, with the maximum size dependent upon
the amount of memory available. (The [Shift-F1] information box
indicates the size of the "virtual screen".)
- The "brightness" of any monochrome (mode A..P) display may be
adjusted, as described below.
- Alt-N negates any monochrome display.
- Alt-R "rotates" the color palette on an MCGA or VGA adapter.
- On an EGA/MCGA/VGA monitor, you may adjust the appearance of the
COLOR image, as described below.
- With the enhanced program, you may print an image by pressing "P"
(or ^P).
Special Modes:
-------------
On an EGA or VGA, with a graphic that's 320x200 or smaller, a "Z" mode is
available:
- If the graphic has 16 colors or less, this will display it double-wide
and double-high using the 640x350x16 or 640x480x16 mode, which will have
much truer colors than the 320x200x16 display.
- If it has more that 16 colors, it will be displayed using a "color
dithering" routine, which simulates over 2000 colors.
On an MCGA or VGA, five "extended" modes are available. These modes work on a
PS/2 or register compatible VGA, although they aren't "IBM standard" modes.
"[" sets the adapter to 360x480x256 mode.
"]" simulates 720x480x256 by skipping every other pixel horizontally.
"," sets the adapter to 320x400x256 mode.
"." simulates 640x400x256 by skipping every other pixel horizontally.
"/" simulates 640x480x256 by skipping every other pixel horizontally,
and skipping one row out of every six.
The simulated modes above and the simulated modes in the video drivers will
provide a good looking display on most graphics, except for areas that
contain text. Text characters on graphics screens may be illegible in these
simulated modes, since some columns and rows are skipped.
Page 12
Video driver modes
------------------
With a video driver loaded, up to seven additional modes (S..Y) are
available. The video driver lets you display graphics using the unique
capabilities of your video card. Keep in mind that some of the video driver
modes may not work on your adapter. For example, a (true, not simulated)
640x480x256-color display requires 512k of video RAM. Similarly, a
1024x768x256 display requires 1meg of video RAM.
NOTE: If you press a key (S..Y) and the screen stays in text mode (perhaps
changing colors), then that mode isn't supported on your adapter. If the same
thing happens on ALL the video driver modes, then you either have the wrong
video driver loaded, or your adapter just doesn't have any "Super-VGA"
capabilities. (VGA adapters that are built-in to a system board or bundled
with a computer are often "low-end" [cheap] adapters without Super-VGA
capabilities.)
CompuShow doesn't consider video driver modes when selecting the best mode to
display a graphic with the space bar, unless you tell it which video driver
modes work on your adapter and monitor. (The System Configuration Program,
CSHOWI, which comes with the enhanced program, automatically sets up the
VIDEO.DAT file described, below.)
For example, assume that modes S, T, U, V, W and X work on your VGA, but your
monitor can't quite handle mode X. Also, mode U is a simulated 640x480x256,
where mode V is the preferred (true) 640x480x256 mode. To tell CompuShow to
use modes S, T, V, and W, create a text (ASCII) file with the characters
"STVW". The name of the file corresponds to the video driver that you're
using: VIDEO.DAT for VIDEO.DRV, or VIDEOP1.DAT for VIDEOP1.DRV (if you start
the program using "CSHOW +SP1"). At your DOS prompt:
COPY CON VIDEO.DAT
STVW^Z
(^Z means hold down the CTRL key and type Z.)
Adjusting a MONOCHROME image
----------------------------
An image displayed in EGA/VGA monochrome mode P may be adjusted by pressing
PgUp to make the image brighter, or PgDn to make it darker. This brightness
adjustment is instantaneous.
An image displayed in a Hercules, CGA, or MCGA monochrome mode (A..O) may be
adjusted by pressing PgUp to make the image brighter, or PgDn to make it
darker. You may also adjust the image to a particular brightness by pressing
the letter key (A..O). This "adjustment" is accomplished by re-displaying the
image. The previous image is left on the screen, so you can see the effect of
the adjustment as the new image replaces the former display. (Displaying an
image in monochrome mode H and then pressing PgUp results in the same image
as monochrome mode G.)
Page 13
Adjusting a COLOR image
-----------------------
EGA:
----
CompuShow uses a "color dithering" technique for displaying images:
- with more than 16 colors,
- which are 320 wide (or narrower),
- when displayed in mode Z ("Zoomed" to 640 wide).
With this technique, the program "simulates" over 2000 colors using a 16
color EGA palette. Dithered images MAY NOT be adjusted. However, you CAN
adjust the colors of a non-dithered image displayed in EGA modes 7, 9, or Z.
The sixteen colors displayed are numbered 0 to 9 and A to F. Color zero is
always the background. To select a color to adjust, type the color number
(0..9 or A..F). That color will flash, so that you can see where it is and
decide whether it should be adjusted. There are two methods for adjusting
colors:
- A selected color may be adjusted by increasing or decreasing the Red,
Green, or Blue component:
RED: decrease [F1] [F2] increase
GREEN: decrease [F3] [F4] increase
BLUE: decrease [F5] [F6] increase
Each color has a Red, Green, and Blue component with a "weight" of 0..3, so
pressing [F2] four times will step through all four levels of Red.
[ 4 (Red) x 4 (Green) x 4 (Blue) = the palette of sixty-four colors. ]
- You may "step through" all sixty-four colors in color number sequence:
COLOR NUMBER: decrease [F7] [F8] increase
The adjusted palette may be saved to disk by pressing Alt-F10 (hold down the
Alt key and type the [F10] function key.) When you display the GIF file in
mode 7, 9, or Z, the program automatically uses this saved palette (press
[F9] to see the original color palette; [F10] to switch back to the saved
color palette.)
MCGA/VGA:
---------
On an MCGA or VGA adapter, you can adjust the colors of an image displayed in
any 16 color mode (5, 6, 7, 9, or Z) or 256 color mode (8), including any
"Super-VGA" modes (S..Y).
- PgUp/PgDn increases/decreases the "brightness" of the image.
- The color may be adjusted:
RED: decrease [F1] [F2] increase
GREEN: decrease [F3] [F4] increase
BLUE: decrease [F5] [F6] increase
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As with an EGA, the adjusted palette is saved to disk by pressing Alt-F10,
and [F9] and [F10] allow you to review the differences between the original
and the adjusted palette.
MCGA/VGA Grayscale:
-------------------
On an MCGA or VGA adapter, any image displayed in a 16 or 256 color mode may
be instantly converted to a "Grayscale", by pressing Alt-G, and returned to a
color display by pressing Alt-C. While the grayscale image is displayed, PgUp
and PgDn adjust the brightness of the image.
Quitting CompuShow
==================
At the input area, press ESCape to exit the program and return to DOS.
The Enhanced Program
====================
The enhanced program (CompuShow version 8.24b) includes all features of the
standard program, plus:
- Printing of all graphics images on most dot matrix and laser printers.
See README.DOC for a complete list of supported printers.
- A "slide show" program with script generator, for automated display of all
graphics in a "stand-alone" or "operator attended" mode.
- A System Configuration program, which lets you change screen colors, and
specify "start-up" options, making the command-line switches unnecessary.
You can also automatically log to a disk drive and/or sub-directory, and
set the type of directory display you want, including:
the [F3] "wide" directory display,
the [F4] directory mask (eg. "*.GIF"),
the [F5] directory sort options.
The user's guide describing these features is CSHOW8B.DOC, included with the
enhanced program.
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S H A R E W A R E
=================
CompuShow is copyrighted software. However, you are encouraged to copy and
share it with others according to the following requirements:
CompuShow may be freely copied and shared with others, so long as
no charge is made for the software, and it is unmodified and copied
in its entirety, including all program documentation and all
support files.
CompuShow may be distributed via modem, provided that all files are
transmitted (archived) together.
Notice that ShareWare is copyrighted software. It's not "Public Domain"
software, nor is it "free" software. If you continue to use this program
beyond a reasonable "trial period", not to exceed 21 days, you must pay for
it by registering.
WHY SHAREWARE?
--------------
A few years ago, we advertised a (much simpler) program in a national
computer magazine. Our advertising cost was so high that, even with a retail
price of $45, we never reached "break-even"! The ShareWare concept turns
CompuShow into its own ad! Our costs are reduced, and we can price the
program accordingly.
ShareWare let's you "try it before you buy it"! You can determine whether a
program works properly and how easy it is to use, before you pay for it.
WHY REGISTER?
-------------
Since CompuShow is a ShareWare product, we don't receive a penny when you
download it from a commercial information service, such as CompuServe or
GEnie, from a BBS, or receive it on a disk of ShareWare programs.
Since version 1.7 was released in July 1987, we've continued to improve and
enhance the program, and have released new versions on a regular basis. Most
of the enhancements were suggested by our registered users, and most of our
registered users have upgraded as new versions are announced. They like
CompuShow and the improvements that their registration fees have made
possible!
If you use CompuShow, you must register:
- Your registration fee makes it possible for us to continue to improve the
program and to provide similar high quality software at reasonable
prices.
- For your registration fee you receive the LATEST COMPLETE VERSION of the
ENHANCED PROGRAM.
- As a registered user, you'll be notified as new versions are released,
and may upgrade for a nominal charge.
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- Registered users may purchase other CaSSS software at reduced prices.
- IF YOU USE THE PROGRAM FOR COMMERCIAL PURPOSES, YOU MUST REGISTER.
Registering for the Enhanced Program
------------------------------------
For your convenience, we've included an order form (OFORM.DOC) with space for
all the required information. (Complete it by hand or with a word processor.)
Prices as of January, 1990
--------------------------
Basic registration, 5.25" disk............................. $25
To receive a 3.5" disk, please add......................... $ 1
For overseas delivery, please add.......................... $ 2
Arizona residents, please include 7% sales tax.............
- Credit Card: Indicate Visa or MasterCard, card number, and expiration
date.
- Check or Money Order: must be in U.S. funds, drawn on a U.S. bank. (A
Canadian Postal Money Order in US Dollars is acceptable.)
- Sorry, no CODs or Purchase Orders.
- The $2 for overseas shipping IS NOT REQUIRED for the continental US,
Alaska, Hawaii, US possessions, APOs, FPOs, Canada or Mexico.
Electronic Mail: CompuServe Mail: [76555,167]
(MCI Mail can be routed to CompuServe)
Internet (BITNET, ARPANET, CICNet, etc.):
76555.167@compuserve.com
GE Mail: R.BERRY7
Paper Mail: Canyon State Systems and Software
Post Office Box 86
Sedona, AZ. 86336
Voice: (602) 282-5070
Orders are shipped first class mail, and registration puts you on our mailing
list for notification when future versions are available. If you're ordering
through a corporation, college, or university purchasing department, an
individual's name would be advisable, so that upgrade notices don't get lost
in "receiving department".
Uploading to a Bulletin Board:
-----------------------------
As mentioned, we encourage you to copy and share CompuShow with others. We do
ask, however, that you be considerate when you upload to a BBS (or give a
copy to a friend, computer club, or user group.) A number of users have
called asking for help because the CompuShow that they downloaded from a BBS
was missing documentation, and/or support files. Be kind to the other guy! If
you're going to upload to a BBS, be sure you include ALL FILES in your
Page 17
upload. Not only is this A REQUIREMENT for distribution as ShareWare, but
it's also the only way to be fair to the people who download it!
Keep in mind that any upload that doesn't include all files will result in
the display of the "missing files" message.
BBS SysOps and ShareWare Distributors:
-------------------------------------
We appreciate the distribution of CompuShow on electronic bulletin boards and
ShareWare disks. If you have a version of CompuShow which may be outdated
(the program date is displayed on the second line of the screen), or you just
want to be sure you have the latest version, contact me. I'll send you the
most current version (at no charge), and put you on a mailing list to
automatically receive free upgrades when available.
If you see the "missing files" message at program start-up, you don't have
the full package and don't have permission to distribute it. If the person
who provided the disk or archive can't supply the missing files, contact me
for the latest complete version.
Viruses and Trojan Horses:
-------------------------
Due to the growing concern over computer viruses, Trojan horses, and other
malicious programs, BBS SysOps and ShareWare distributors have started
establishing "direct from author" libraries, or providing ONLY that software
which they receive directly from the author. We feel this is an excellent
policy, and expect to see it become more common as time passes.
For your information, we post CompuShow to CompuServe and GEnie, and mail
copies directly to a number of BBS SysOps and ShareWare distributors. We
NEVER post directly to BBS's.
(Just to put in one last "plug"), your concern about possible "virus
infection" is another reason to register the ShareWare that you intend to
continue using.
Thank you for your support: Bob Berry
Canyon State Systems and Software
Post Office Box 86
Sedona, Az. 86336
Voice: (602) 282-5070
CompuServe: [76555,167]
Internet: 76555.167@compuserve.com
GEnie: R.BERRY7
Graphics Interchange Format(c) copyright CompuServe Inc.
GIF(sm) is a Service Mark property of CompuServe Inc.
Copyright (c) 1991, Canyon State Systems and Software (tm), Sedona, Az.
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