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GRABEGA.DOC
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1987-10-25
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199 lines
GRABEGA Page 1
Command
------------------------------------------------------------
Purpose: Capture an EGA graphics screen to a disk file in a
format compatible with RIX SoftWorks' EGA Paint 2005
and with EGA2GIF by SPARKS.
Format: [d:path\]grabega [/480]
Type: External
GRABEGA Version 3.0 22oct87
Copyright 1987 by Ray L. McVay (all rights reserved)
S P A R K S
1609 Tulip Drive
Arlington, TX 76013-4915
CIS 75006,2563
Remarks:
GRABEGA is a TSR (terminate and stay resident)
utility that captures EGA 320x200, 640x200, 640x350
and 640x480 graphic screens to files formatted like
uncompressed EGA Paint screen files. When run, it
prints a sign on message and loads the resident
portion of the program which occupies about 2700
bytes of memory. It has been used concurrently with
EGA Paint 2005, Sidekick, CED, STACKEY, CTRLALT and
EGABLANK2 with no problems but is incompatible with
BASIC interpreters, QuickBASIC, SYMDEB and Code
View. Running one of the incompatible programs with
GRABEGA resident will cause your computer to lock up
and require the "big red switch" to recover.
In general, you should treat GRABEGA as a special
purpose utility to be loaded and used only when
needed. Save yourself a lot of grey hair and always
reboot your computer when you are finished using
GRABEGA or any other special purpose resident
software.
To activate GRABEGA and save a screen you rapidly
press and release the left shift key twice. If all
is well you will see activity on the default disk
drive and hear a normal BEEP when GRABEGA is
finished. Wait until you hear the BEEP before
moving a mouse cursor around the screen or your
screen image will be corrupted.
If GRABEGA cannot save the screen then it will make
an odd noise and ignore the keystrokes. There are
two main reasons GRABEGA will not be able to save a
screen: 1. The screen is not in one of the
recognised EGA graphics modes. 2. The program that
is running is executing an un-interruptable DOS or
BIOS function.
GRABEGA Page 2
Command
------------------------------------------------------------
The files written by GRABEGA vary in size from 32016
bytes to 153616 bytes depending on the type of
screen it is saving. The files all have names
following the pattern EGASCRNx.SCy where the "x" in
the pattern will change with each screen to produce
a unique name. The "y" is set automatically
according to the size of the screen being saved as
shown in the following table:
D 320 x 200, EGA mode 13 (not an EGA
Paint format)
E 640 x 200 EGA mode 14
R 640 x 350 EGA mode 16
P 640 x 480 extended EGA mode inabled
by using /480 option
For example, the first 640x350 screen saved will be
EGASCRNA.SCR, then EGASCRNB.SCR, etc. These files
are written to the current working directory of the
default disk drive.
GRABEGA uses a little known feature of the EGA BIOS
called the "dynamic save buffer" to determine the
palette settings of the EGA at the time of the
screen capture. Programs that alter the EGA palette
settings by writing directly to the registers on the
adapter card will probably produce captured screens
with invalid colors. Microsoft WORD is the only
example of this behavior that I've found so far.
The files produced by GRABEGA can be converted to
CompuServe Graphic Interchange Format (GIF) picture
files by the EGA2GIF utility included in this
package. All but the 320x200 screens can also be
read and edited using EGA Paint 2005 by RIX
SoftWorks.
TSR Shell Credit:
Much of the stability of GRABEGA is due to the fine
TSR shell copyrighted 1987 by Thomas Brandenborg,
Lundbyesgade 11, DK-8000 Aarhus C, DENMARK.
Shareware license:
You are granted a non-exclusive license to use
GRABEGA for your personal enjoyment. You may not
sell GRABEGA or include it with other software you
offer for sale. If you use GRABEGA regularly
because it fills a unique graphics need then a $10
donation to SPARKS, 1609 Tulip Dr., Arlington, TX
76013 would be appreciated. If GRABEGA is used in a
commercial environment then it MUST be licensed for
$10 per active copy. Contact SPARKS for details on
site licenses, custom versions and GIF applications.
GRABEGA Page 3
Command
------------------------------------------------------------
SPARKS also offers shareware versions of EGA2GIF (a
GIF encoder) and EGAGIF (a GIF viewer). These also
carry shareware contrbution or commercial licenses
of $10 per package. Any two of these may be
licensed for $15 and all three may be licensed for
$20.
Graphics Interchange Format and GIF are trademarks of
CompuServe, Inc. an H&R Block Company. EGA Paint 2005 is a
trademark of RIX SoftWorks, Inc. QuickBASIC, SYMDEB and Code
View are trademarks of Microsoft.