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1993-01-04
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:gdoc sec='IBM Internal Use Only'
:frontm.
:titlep.
:title.VGALOGO
:title.
:title.Version 1.21
:author.Christian Michel
:address.
:aline.IBM Deutschland GmbH
:aline.BI Berufsausbildung Sindelfingen 1
:aline.Kst.: 5318 - Adrs: 7032-54
:aline.VM-ID: CMICHEL at STUTVM3
:eaddress.
:etitlep.
:body.
.rh VGALOGO 1.21
:h1.History of changes
:xmp.
10/13/88 Version 1.0 placed on PCTOOLS
10/17/88 Version 1.1 with these changes &gml.
- three new options within the Ln parameter
0 -> little logos are suppressed
4 -> little logos are static black
5 -> little logos are static white
- runs also with monochrome displays
11/10/88 Version 1.2 with these changes &gml.
- S option added to supress snow on slow
machines like model 25 and 30.
- problems with SETVGA solved.
VGALOGO now doesn't show those funny effects
when used together with SETVGA.
- When leaving VGALOGO the old palette is
restored.
- source files included in the package
11/22/88 Version 1.21 with these changes &gml.
- 3 new shades for the little logos added.
Now you can have the shade not only about
the single logos but also about the whole
screen. Values of new shades :
6 -> shade from left to right (similar to 1)
7 -> shade from outside to center (similar to 2)
8 -> shade from center to outside (similar to 3)
- The status of the palette is checked at the
beginning of the program. So the palette is
only frozen if it was at the start of VGALOGO.
So the problems with curious palettes should
be ended.
:exmp.
:h1.How to use the VGA_IBM_Logo program - Version 1.21
This program was developed referring to the IBMLogo demo program
for the 8514 graphics adapter by David A Kerr. The VGA / MCGA version
displays the logo in the 320 x 200 x 256 colors mode.
:p.
The program runs on VGA and MCGA - graphic adapters with color or
monochrome displays.
:p.
In the middle of the screen there is a big IBM-logo with a 3-D effect
and in the background some little logos are showed.
Both, the big and the small logos are shaded with different colors
that change all the time. That looks as if the colors are scrolled
through the logos.
:p.
The simpliest way to execute the demo is to run it without any
options&gml.
:xmp.
VGALOGO
:exmp.
In this case at first a screen with some comments is displayed.
After any key was pressed, the demo starts. (Don't wonder it takes
about 2 seconds to build up the screen.)
:p.
The demo can be stopped at any time by pressing ESC.
:h2.Options
:p.To get a short list of possible options just type this command&gml.
:xmp.
VGALOGO ?
:exmp.
The Options are&gml.
:xmp.
VGALOGO [?] [Ln] [Wn] [D<n>] [S<n>]
:exmp.
:ul.
:li.Ln &gml.
:p.This option describes the way the little logos in the
background are shaded. There are nine possibilities. In the first way
the colors in the logos scroll from the left to the right side, in
the second way the colors are scrolled from outside to center and
in the third way from center to outside. These three shades are also
available about the whole screen, not only about the single logos.
Additionally to them there are modes to suppress the logos, to have
them in static black or white.
.pa
The numbers for the six possibilities are &gml.
:xmp.
0&gml. supress the little logos
1&gml. scroll colors from left to right (single logos)
2&gml. scroll colors from outside to center (single logos)
3&gml. scroll colors from center to outside (single logos)
4&gml. little logos are static black
5&gml. little logos are static white
6&gml. scroll colors from left to right (whole screen)
7&gml. scroll colors from outside to center (whole screen)
8&gml. scroll colors from center to outside (whole screen)
:exmp.
:li.Wn &gml.
:p.This option defines the speed the colors are changed.
Or to be exactly n is the number of vertical retraces between the
palette changes (about 16 ms per retrace).
:p.(0 <= n <= 10)
:li.D &gml.
:p.With this option you can skip the title screen without specifying
the duration of the program.
:li.Dn &gml.
:p.With this option you can set the time, the demo should run.
If this option is specified the title screen is skipped,like
the simple D - option, so that the program can be called
from batch-files for a certain time without showing the title screen |
:p.The specified time is only an approximate time.
:li.S<n> &gml
:p.This option is especially for slow computers like model 25 and 30.
As on 8086 machines some snow appears on the screen, because the
processor is not fast enough to change the palette in the time of
the vertical retrace, this option divides the palette changing routine
into two parts so that the change can be done within the flyback.
This causes a slowdown of the whole color sweep (same speed as
the W1 option in normal use of program).
:p.Use n=1 or no additional number to slowdown the routines, n=0 sets
the fast speed. The n=0 is to override the preset state of the slowdown
mode. The slowdown mode is set on any computer which has no 80286
processor (the decision is made with the help of the equipment byte
in the ROM). On PC/AT, PC/XT 286, PS/2 Model 50..80 it runs in the
fast mode.
:eul.
:h1.Problems
:p.When using VGALOGO some problems were reported.
:ul.
:li.VGALOGO doesn't get along with host-emulating software.
:p.When you change the screen from VGALOGO to host, the host
screen isn't readable anymore. This effect disappears when you
exit VGALOGO in the DOS-task.
:li.HOWARD, the program to change the character set seems to change
BIOS-interrupts so that VGALOGO can't recognise which graphics
adapter is used. So VGALOGO only tells you that you need a VGA
or MCGA. This problem did not occur with my version of HOWARD.
I use version 2&per.30.
:li.I discovered that VGALOGO doesn't coexist with EGAX, which
is used to upload new fonts.
:eul.
:p.If some other problems occur, please send me a note with a short
description of the trouble effects.
:h1.Comments
If you have any comments to this program send your notes to
CMICHEL at STUTVM3. As I am in job training, I'm not
all the time at IBM locations and so the response to your
requests can take a little time.
:p.My adress is as follows &gml.
.in 10
:xmp.
Christian Michel
IBM Deutschland GmbH
BI Berufsausbildung Sindelfingen 1
Adrs. 7032-54 Kst. 5318
:exmp.
.in 0
:h2.Source
:p.As so many people were interested in the source, I decided to include
it in the package. Unpack the source files LOGOSRC FLSBIN with
LOADRAM. The package contains the pascal-file, a short assembler
file (set palette routines) and the &per.OBJ-file of the assembler
routines. (For those who have already the source of version 1.1 &gml.
The palette set routines have only been removed from the pascal INLINE
to improve the legibility.)
:p.
VGALOGO was developed on my own time and on my own equipment
with the help of Dan Butterfield (DAZZLE) who delivered the
routine to change the palette and with the source of the
IBMLogo - program by David A Kerr.
So it is considered IBM INTERNAL USE ONLY.