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XDV.TEC
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1990-07-05
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ID:XD Discussion of XDV
by Bob Perry, QOS.REP2
Q. Why does XDV hang my system, but DV works all right?
Q. Why can't I run large memory size programs with DV?
XDV is the command to start DESQview. You should type XDV at
the DOS prompt, or modify your AUTOEXEC.BAT file so it runs XDV. This
command allows DESQview to "see" and use all of the memory you have
installed in your machine. If you choose to type and run DV instead of
XDV, your memory sizes for programs will drop significantly because
DESQview cannot "hide" itself in high RAM, if you have any. Thus as
much as 224K of DESQview overhead will come out of your conventional
memory. Running a program larger than 384K may be impossible if your
system does not have more than 640K of RAM.
Infrequently users experience a system "hang up" running XDV,
but DV works (although memory sizes aren't as large as expected with
XDV). This most often takes place on systems where XDV tries to map
itself into memory areas it has detected as being available in the
Reserved Area. The Reserved Area lies above 640K and below 1024K (1
Megabyte) and is generally used by video adapters, network cards, and
other devices. In the case of a "hang" it could be because XDV has
put some code into an open area of memory which is later actually used
by one of the peripheral devices on your system.
One type of video adapter made by various manufacturers is known
as an "auto switching" or automatic mode switching. BE SURE YOU HAVE
DISABLED THE AUTOSWITCH ON YOUR VIDEO CARD, if you have one. Auto-
switching video cards have physical switches on the video adapter
which must be disabled in order to run XDV. Some rare video cards
have a software selectable autoswitch option which also must be
disabled.
Users of high resolution video cards, peripheral devices, or
network cards such as the Token Ring adapter may find that their
peripheral cards cause XDV to hang the system. This problem is solved
by using an exclusion parameter on their memory manager. The
exclusion parameter should exclude those areas of high RAM used by the
peripheral device, and their hexadecimal address range is best
obtained from the manual (or the vendor) of the device.
EEMS (AST RAMpage, etc) users should normally disable mother-
board memory and backfill from the EEMS board. If by some error in
installation motherboard memory is not disabled, but backfilling is
enabled anyhow, XDV may cause a hang.
Copyright (C) 1990 by Quarterdeck Office Systems
* * * E N D O F F I L E * * *