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- ID:WZ Maximizing Window Size in DESQview
- Quarterdeck Technical Note #161
- by Dan Sallitt
-
- First, the basics. If you have any kind of expanded memory or if
- you have extended memory and have placed DESQview's QEXT.SYS
- driver in your config.sys file, you should be starting DESQview
- with DV.COM or XDV.COM instead of DV.EXE. Most users have a
- DV.COM file in their DESQview directory, either because the
- DESQview Install program placed it there or because of the
- recommendation in our documentation that XDV.COM be renamed to
- DV.COM. In this case you can simply type DV at the DOS prompt
- and be assured that the .COM file is being used. However, some
- users do not have a copy of DV.COM in their DESQview directory
- and start DESQview with the DV.EXE file instead of the XDV.COM
- loader. Failure to start DESQview with the .COM file is a
- possible reason that window size may fall short of the user's
- expectations.
-
- If you are starting DESQview with the proper executable file and
- you still can't open a window as large as you think you should be
- able to (our documentation includes a table that gives you an
- idea of what to expect), there are several common reasons.
-
- 1) Drivers and terminate-and-stay-resident programs (TSR's)
- loaded before DESQview may be taking more memory than you expect.
-
-
- The amount of memory available to a window inside DESQview
- decreases as more memory is used up before DESQview; this is true
- no matter how much extended or expanded memory is on the system.
- If you want to decrease this overhead, you have a few options.
-
- a) Streamline your CONFIG.SYS and AUTOEXEC.BAT files.
-
- b) Load some programs inside DESQview. If a TSR doesn't
- have to run before DESQview (obviously, some programs, like
- disk caches and print spoolers, wouldn't serve their
- function when loaded inside a window), it's much more
- memory-efficient to let DESQview manage it. Even some
- CONFIG.SYS drivers can be loaded inside a DESQview window
- using DESQview's DEVICE.COM utility.
-
- c) If you have the Quarterdeck Expanded Memory Manager-386
- (QEMM-386), or if you have expanded memory that can be
- mapped freely in the area between 640K and 1024K and you
- have Quarterdeck's QRAM.SYS utility, you may be able to
- decrease your memory overhead by loading devices and TSR's
- into high memory. (You may even be able to do this if you
- have an expanded memory manager with its own high-loading
- capabilities, such as All Computers' ALLEMM4.SYS for the All
- Chargecard.) Any unused address spaces between 640K and
- 1024K (different systems will have different amounts of free
- space in this area) can be filled with expanded memory and
- used to run small programs that would otherwise occupy
- conventional memory.
-
- It is worth remembering that DESQview loads itself high (with its
- XDV.COM driver) in the same areas that QEMM-386 and QRAM use to
- place drivers and TSR's. If you place enough programs in high
- memory before running DESQview, you will sooner or later reach a
- point at which the high loading no longer increases your window
- sizes inside DESQview, because DESQview will be forced to start
- loading pieces of itself in low memory when high memory gets
- crowded enough. At this point one can sometimes get creative in
- finding new places to put RAM in the reserved memory area between
- 640K and 1024K. Which brings us to the second reason that memory
- figures inside DESQview may be falling short of expectations.
-
- 2) On an extended or expanded memory system, less of DESQview may
- be going into reserved memory than is possible. To evaluate this
- situation properly, it's helpful to have some experience with
- DESQview's normal use of reserved memory. A few rules of thumb
- apply, however.
-
- a) On 80286 systems that have the first 64K of extended
- memory free, DESQview's XDV.COM loader can put 63K of
- DESQview code into extended memory if the QEXT.SYS driver is
- in the CONFIG.SYS file. On 80386 systems, QEMM-386 obtains
- the QEXT effect automatically for you; if you are using
- another memory manager, you may wish to tell it to leave
- behind 64K of extended memory and use QEXT.SYS. (Compaq's
- CEMM is also able to obtain the QEXT effect without QEXT
- being present.)
-
- b) On some expanded memory systems DESQview can put some of
- its code in unused video areas. The A000-AFFF area (640K to
- 704K) is used for EGA and VGA graphics, and should be
- available if EGA and VGA graphics aren't used. The
- B000-B7FF area (704K to 736K) is used for monochrome text,
- and should be available on a color system. The B800-BFFF
- area (736K to 768K) is used for color text (and sometimes
- for Hercules graphics), and should be available on
- monochrome systems. You can try including the appropriate
- areas on your memory manager's CONFIG.SYS line.
-
- c) Some expanded memory managers (notably the Intel
- Aboveboard Plus) only allow memory mapping to occur
- immediately above the expanded memory page frame. See our
- technical note on the Aboveboard Plus for information on how
- to maximize this mappable area.
-
- d) Adventurous users of QEMM-386 version 5.0 will notice
- that the command QEMM ANALYSIS gives a list of the different
- areas of memory that may be claimed for DESQview and
- QEMM-386's LOADHI function to use. This utility, which
- should be acted upon only after it has been run on several
- occasions after you have run the full complement of programs
- that you normally use, should give you an idea of which
- areas in your system ROM may in fact be unused and available
- for including with the QEMM-386 INCLUDE parameter. There is
- an element of trial and error to this process, but the
- rewards can be substantial. Even if you are using another
- memory manager or an earlier version of QEMM-386, it may be
- possible through a series of blind attempts to find unused
- ROM areas that can be included and used to decrease your
- memory overhead. The ROM area F000-F7FF, sometimes used
- only by the ROM BASIC, is a favorite area to try including;
- sometimes a slightly smaller inclusion, such as F200-F7FF,
- is necessary. If you guess incorrectly, your machine may
- not boot properly, so you may wish to keep a bootable DOS
- diskette handy during this process.
-
- 3) Sometimes DESQview's Setup program contains excessive memory
- allocations that cut down on DESQview's overall memory. The two
- field that are abused most often in this regard are both on the
- Performance option of the Advanced Setup.
-
- "Common Memory" is memory used by DESQview to manage its windows,
- and the amount you need is usually proportionate to the number of
- windows you open. The default value is 17K; the minimum value of
- 13K is adequate for users who open no more than five or six
- windows at once. Few users need more than 20K of common memory.
-
- "DOS Buffers for EMS" is memory used by DESQview to manage file
- operations into expanded memory. The default value is 2K; users
- of QEMM-386 who are not on a network can set this figure to 0K
- with no loss of performance and a memory savings of about 5K.
- The value of this field can affect the speed of disk access;
- however, it is rarely worth while to choose a value higher than
- 10K or 15K.
-
- If you wish to throw away a few DESQview features, you can
- probably scrimp a few more K from the Setup program.
-
- On the Keyboard option, you can save as much as 12K if you tell
- DESQview that you don't wish to use the Learn feature. This will
- disable DESQview's very useful macro system.
-
- On the Video Monitor option, you can save anywhere from 0K to 16K
- if you tell DESQview that you don't wish to display text and
- graphics at the same time. This will disable DESQview's Video
- Options menu, prevent graphics programs from being seen when they
- are in background, and prevent virtualization of graphics.
-
- On the Performance option, you can save 2K by setting the "Manage
- Printer Contention?" field to N. (However, this field defaults
- to N.) This means that DESQview will not intervene to prevent two
- programs from printing at the same time.
-
- Copyright (C) 1991 by Quarterdeck Office Systems
- * * * E N D O F F I L E * * *