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MODES.DOC
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1993-07-29
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ABOUT GRAPHICS MODES
When The Multimedia Workshop starts up, it automatically
detects the graphics card in your computer and adjusts
accordingly. With most graphics cards there are two or more
graphics modes available in which you can work. For instance,
if you have an EGA system, you can create pictures in one of
two EGA modes (16-colors) or in one of two CGA modes (2 or 4
colors). But if you use the EGA-High mode, other computers
with only CGA will not be able to display your presentations
properly. So, you'll have to decide what mode to use. Of
course, your presentations will look better if you use the
highest resolution mode your computer supports, but at the
cost of losing the portion of your audience who have only
lower resolution equipment.
Resolutions are measured in pixels, the little dots of
which everything that appears on your monitor are composed.
These are the modes supported by The Multimedia Workshop:
CGA-LO 320 x 200 4-color
CGA-HI 640 x 200 2-color
EGA-LO 640 x 200 16-color
EGA-HI 640 x 350 16-color
Hercules 720 x 348 2-color
VGA-HI 640 x 480 16-color (see note 1)
VGA-LO 320 x 200 256-color
XGA 320 x 480 256-color (see note 2)
SVGA 640 x 480 256-color (see note 3)
Universal Mode 640 x 200 2-16 colors (see note 4)
When starting a new script file, you are asked if you
want to change video mode. If you answer [y], then your
computer will present a menu of the graphics modes available
on your particular computer. You can also change video mode
in the middle of a script file from the FILE menu.
If using a Hercules system, no menu is presented, since
there is only one video mode available and therefore no
choice.
Most VGA-equipped systems can work in Hercules mode, but
must be configured with software which comes with your video
card at the DOS prompt before starting programs such as
TMW or Mshow.
Note #1 VGA-HI 640 x 480 16-color
This mode is the highest resolution which most VGA cards
can support. It really requires 640k of RAM. In most
cases, the runtime engine MSHOW.EXE will work fine on any
system with VGA graphics in this mode, but if the end user
has a ton of TSRs or a monster shell program, results could
be unpredictable.
The creation program, TMW.EXE, however, requires every
bit of the 640k of RAM, and even fairly small TSRs or shells
can sometimes get in the way. If you use this mode and get a
low RAM warning, try commenting out your TSRs in your
autoexec.bat file, or running from DOS rather than from a
shell. The Multimedia Workshop and MSHOW.EXE do try to use
XMS or EMS when available, but we have seen systems where it
is not available and the low 640k is also full of stuff.
Generally this happens with a large SMARTDRV.SYS or ramdisk,
or with DOS 5 loaded low, or with STACKER or other software
loaded low. See your MS-DOS manual for more information if
you have 1mb of RAM or more, yet you get a low RAM warning.
Note #2 XGA MODE
This mode gives you 256 colors in 320 x 480 resolution
which is nearly Super-VGA, yet it runs on almost all
ordinary VGA-equipped computers. There are two limitations:
There is no text font which looks "ordinary" with this
mode, and there are few .PCX files created in this mode.
SVGA MODE
This requires a Super-VGA equipped computer with 1mb
video RAM. It is not available in the shareware version.
With some SVGA video cards, The Multimedia Workshop will
not run in Super-VGA mode under MS-Windows, so you'll have to
quit Windows and run from the DOS prompt.
Note #4 UNIVERSAL MODE
Universal Mode will run on any IBM-compatible computer
which has any standard graphics system. The resolution is
the same as EGA-LO at 640 x 200 pixels. If the computer has
EGA or VGA capability, your Universal Mode presentation can
have up to 16 colors, but the exact same presentation can run
on Hercules or CGA systems with only 2 colors! This is very
useful in creation of catalogs and shareware, where your
audience may have a variety of different computer equipment.
While Universal Mode products will run with MSHOW on all
standard IBMs, The Multimedia Workshop will create in
Universal Mode only on computers equipped with EGA or VGA,
because of their 16-color potential. You can, however,
create Universal Mode presentations on CGA and Hercules
systems, by editing the "mode" line at the top of your script
files to read: "mode0." And, you can guess at the colors by
editing the "O" lines with numbers corresponding to the
colors you want on EGA and VGA displays.
To create in Universal Mode, certain conventions must be
observed. .PCX files created for different resolutions will
not work properly. The aspect ratio is changed a bit for
Hercules systems. Circles will be circular on all systems,
but their overall size grows on Hercules displays. You might
rather use ellipses in Universal mode to ensure a functional
picture in all situations. Small CGA laptop displays
sometimes squish a relatively square image to rectangular.
You should definitely test Universal Modes on a variety of
equipment to be sure your creations will be sensible for all
end users.
The first 8 colors on the color menu will appear as black
on CGA and Hercules displays, while the last 8 colors will be
white. Therefore, fills can work differently on EGA and VGA
displays than on their lesser cousins.
NOTE: If you use modes 4,6,8 or 9, then you might want to
know about two drawing modes used by The Multimedia Workshop
called Xor Mode and WSYIWYG Mode. These modes affect the way
Lines, Rectangles and Filled Boxes work, but only when using
modes 4,6,8 or 9.
WSYIWYG is the standard mode, used by all the other video
modes, and shows Lines, Rectangles and Filled Boxes exactly
as the will appear in the finished product. (hence the
acronym: What You See Is What You Get) However, it is slow
and blinky in the listed modes. Therefore, you can also
select Xor Mode from the Door menu. In this mode, colors are
not always truly represented until you have finished drawing
an object, but it is a fast and smooth mode. Also, Filled
Boxes are empty rectangles until you press [Enter] or the
left mouse button. Xor Mode is the default when The
Multimedia Workshop is first started.
_____________________________________________________________
end of chapter.