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Magnum One (Mid-American Digital) (Disc Manufacturing).iso
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VGA.TEC
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1990-07-05
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ID:VG Discussion of DESQview Video Modes
1) Available font sizes: 25, 30, 50, 60
a) Text fonts: 25, 50
b) Graphics fonts: 30, 60
2) Ways to use different font sizes
a) ALT-Rearrange-Video displays font size choices in Desqview
b) Setting the program itself to a certain font size should be
respected in Desqview, but you may need to adjust 'Maximum
Height' to an appropriate number of lines or 'Text Pages to
2 or greater, but if 'Text Pages' is set to greater than 1,
'Maximum Height' is limited to 25. It sometimes works better
to set 'Text Pages' to '2', and sometimes 'Maximum Height'
set to the higher number works better. These settings are
in 'Change-a-Program', 'Advanced Options.
3) Ways programs write to the screen
a) Directly to Video Memory (Write directly to the screen)
b) Ask to BIOS to write to screen (Screen writing managed by BIOS)
4) Which programs write directly to the screen
a) All Graphics Programs
b) About half of all text programs
5) What the screen can display at any one time
a) One text font
b) Any number of graphic fonts and graphic images
6) How to tell if a program writes directly to the screen
a) If it's a graphic program, it writes directly
b) Set 'Change-a-Program', 'Writes Text directly to the screen?'
to 'N'. Now start the program and try to put it in a small
window. If it writes outside of the Desqview borders, that
means the program writes directly and 'Writes Text Directly...'
must be set to 'Y'.
7) When you need to set 'Virtualize Text and Graphics' to 'Y'
a) Virtualization is only for Direct Screen Write programs
b) You only need to Virtualize if you want the progam to stay
running while it's in the background or stay running while
it's in a small window.
c) Virtualizing slows programs down, so if your program doesn't
need to stay running in the background or in a small window,
you would want 'Virtualize...' set to 'N'.
d) Virtualizing requires Expanded Memory. If the machine is
low on Expanded memory, the screen could behave poorly
when a Virtualized window is displayed.
e) If a program is not a Direct Screen Writer, 'Writes Text
Directly...' and Virtualize...' should both be set to 'N'.
Desqview can run these programs in a small window and in
the background without any special adjustments.
8) Switching Video Modes
a) When switching from a window that is using a Graphic mode to
a window that is using the 25 line Text mode, the Text program
will sometimes display 25 lines on a 30 line screen. When
this happens, the bottom 5 lines of the screen will display
the program that is in the background. Because there is no 25
line Graphic mode, Desqview has to do it this way. When the
screen is in a graphic mode, Desqview has to display Text
programs as a Graphic also. In graphic mode only 30 and 60
line fonts are available.
b) One way to run a Graphic program and still have your Text
program display in a 25 line font is to do ALT-Rearrange-Hide
before switching away from the Graphic program. This will
hide it from the screen and allow the Monitor to switch to
the 25 line Text font. A hidden program that writes directly
to the screen (all Graphics programs) will not be able to run
while it is hidden.
c) Another way to use a Graphic program and switch to a 25 line
Text program is to run the Desqview 'Setup' program and set
'..display Text and Graphics at the same time?' to 'N'. Now
when you switch from the Graphic program to the Text program,
Desqview will put a Curtain over your Graphic program and
allow the Monitor to return to the Text mode. Virtualization
will not be possible when this option is selected.
9) Extended VGA Modes
a) The highest resolution in the IBM VGA Specification is 640x480.
b) Some VGA cards have the capability of displaying resolutions
of 700X420, 800X600, and 1024X768. These modes are not
standardized and most of the manufacturers of these cards
impliment these resolutions differently - consequently
Desqview cannot fully support these modes.
c) Desqview will support 640X480 in that it can Save and Restore
screen when programs are switched away from and back to. It
can also Virtualize this resolution, meaning it will allow a
'Direct Screen Write' program to stay running in a small
window or in the background without bleeding through the
foreground window.
d) Desqview can Save and Restore 800X600 on some VGA cards if
'Graphic Pages' in 'Change-a-Program' is set to 4, but it
cannot Virtualize it. I'ts sometimes O.K. to set 'Runs in
Background' to 'Y' and not Virtualize for purposes of printing
in the background if the program doesn't do screen updates
or only does minor screen updates while it's printing.