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- ID:VG Discussion of DESQview Video Modes
- Quarterdeck Technical Note
- by Joe Wilder
-
- 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) Use BIOS to write to screen (Screen writing managed by BIOS)
-
- 4) Which programs write directly to the screen
-
- a) All Graphics Programs
-
- b) Approximately 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 Writes text directly to the screen? to N on the Change
- a Program menu 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. It's 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.
-
- Copyright (C) 1990 by Quarterdeck Office Systems
- * * * E N D O F F I L E * * *