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1986-03-03
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Part of the ENHANCER series of programs EGACHG.COM Ver. 1.1, Feb 17, 1986
Copyright (C) I. B. Miller 1985, 1986
If you find this of value and use it please send a
contribution ($25.00) suggested.
To: Enhancers It is suggested that companies contribute
231 Otonabee Ave. more for use on more than one machine.
Willowdale, Ontario, Canada
M2M-2S9 Please contact me for a site license
Phone (416) 226-9753
EGACHG is a program which provides a means to preset 12 palette color
combinations for EGACLR.COM a companion program which Controls the seventeen
palette registers on the enhanced color card ( Enhanced Graphics Adapter),
12 different user selected color combinations of any 16 of the 64 colors
available can be made active by use of the Alt key at the same time as any of
the number keys 1 to = at the top of the qwerty keyboard. EGACHG will change
the colors in the Palette registers so that you can see what is available but
unless you use EGACLR these will be lost at the next video reset called by
any program.
The actual colors available to you depend on your actual hardware set
up and so may be different. As an example if you have only a regular monitor
you will have only standard colors though you will be able to swap them around.
In my experience THE limiting factor for text display is the monitor. Though
for graphic display memory size is also a limiting factor.
General Information
-------------------
With the Enhanced Monitor color coding is as follows.
Bit Hex
--- ---
1 is Medium Blue - 01
2 is Medium Green - 02
3 is Medium Red - 04
4 is Low intensity Blue - 08
5 is Low intensity Green - 10
6 is Low intensity Red - 20
1+4 is High intensity Blue - 09 Low and medium add to give
2+5 is High intensity Green - 12 high - this is the basic
3+6 is High intensity Red - 24 principle the card works on
Following is the standard color palette combination.
----------------------------------------------------
B B G C R M B W G High intensity colors O
l l r y e a r h r --------------------- v
a u e a d g o i e B G C R M B W e
c e e n e w t y l r y e a r h r
k n n n e u e a d g o i s
t e e n e w t c
a n t n e a
a n
palette
register # = 0 1 2 3 4 5 6 7 8 9 A B C D E F 10
^-this is the
Seventeenth or in hex it
is 10. It really cannot be used
in Enhanced Mode because of a seeming
bug in the EGA. I cannot believe IBM
wanted it that way. Try it and see.
How the program works
---------------------
The program works by loading in the entire EGACLR.COM file
and then selecting the color controlling bytes which are all near
the start as initial values for setting the colors. It then follows
the user through the registersets updating them in memory and
changing them and the colors on display as the user dictates.
Once the user is finished changing colors to his liking and
has pressed the End key EGACHG first checks to see how high in the
sequence of possible EGACLR1.COM to EGACLR99.COM exists on the disk.
once found it increments this and writes out a temporary file. After
it has succeeded in the write it renames the original EGACLR.COM to
EGACLR(whatever #).COM and then renames the temporary file to
EGACLR.COM. In theory you could change names and have almost unlimited
numbers of color combinations which can be made active by using these
variants of EGACLR.COM, but in practice I find it adequate to have
a few and use the command parameters with EGACLR.COM to change <alt 1>
Instructions
------------
EGACHG has been written to work on the EGACLR.COM file on the
same drive as EGACHG.COM. Make sure both are present on the same disk.
Important: Unless you use the EGACLR o command line to turn off auto reset,
or have not yet activated EGACLR, then EGACLR will proceed to
not allow this program to show the colors to you. You must
Deactivate (or not start) EGACLR before starting EGACHG.
The program will proceed to load into itself the EGACLR.COM file.
It will then paint a window on the top half of the screen showing the
palette colors currently in use with EGACLR use of <Alt 1> which
I call registerset # 1. The program will next paint the bottom window
which is the working area and will display the current register of the 17
included in the current registerset as well as the current value in that
register displayed in both decimal and Hex. It will also show the RGB comp-
onents of the color corresponding to that value.
The screen painted appears approximately as follows with of course the
addition of color.
EGACHG.COM A program to change colors to any 16 of 64 available on the EGA
for use with a companion program EGACLR.COM which must be on same drive.
Register 0 1 2 3 4 5 6 7
_______________________________________________________________________
| | | | | | | | |
| | | | | | | | |
| Blocks of colors appear here and change as palette registers change |
|________|_______|________|________|________|________|________|________|
| | | | | | | | |
| under the control of the operator | | | |
| | | | | | | | |
|________|_______|________|________|________|________|________|________|
Register 8 9 A B C D E F
Below is current color being worked on.
____________________________________________________________________________
| |
| |
| |
|__________________________________________________________________________|
PgUp & PgDn change registerset, Up & Dn change registers, + & - change colors,
End to quit & save , Q to quit & not save! ,W to write BAT file ,R,G,B to vary
Current Palette Registerset is : 5 10,11,12 are 0,-,=
Current Palette Register is : 01 Color is: 2 Color in Hex is : 02
Current RGB values are : R= off
G= med
B= off
From then on you are in the part of the program that does all the
work and the following keys are the only ones which will do anything.
PgUp Moves Up one registerset from 1 to 12 then back to 1
PgDn Moves Down one registerset from 12 to 1 then back to 12
Up-Arrow Moves up one Pallette register from 0 to 16 then back to 0
0 to 10 Hex
Dn-Arrow Moves Down one Pallette register from 16 to 0 then back to 16
10 to 0 Hex
+ Increases value in Pallette register from 0 to 63 then back to 0
0 to 3F hex
- Decreases value in Pallette register from 63 to 0 then back to 63
3F to 0 hex
R Changes Red component of color through off, low, med, high & back
G Changes Green component of color through off, low, med, high & back
B Changes Blue component of color through off, low, med, high & back
Q Allows you to quit without creating an output file
S Standardizes colors In current Registerset
W writes out a .BAT file to reset colors in Alt 1 . A sample appears
here.
EGACLR 02A,126,202,337,404,505,614,707,818,919,A1A,B1B,C3C,D2D,E36,F3F,s00
End Writes out all the values to an EGACLR.COM files while saving the
previous ones as EGACLR1.COM up to EGACLR99.COM
Use the End key when you have completed your selection.
the program will then update EGACLR.COM with your selected
colors available from <alt 1> to <alt =>.
you may then activate the colors by entering at the DOS prompt
EGACLR R
Disclaimer
----------
For obvious reasons the user is totally responsible for use of this