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1997-05-15
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MS-DOS 6 and Quarterdeck Products
Quarterdeck Technical Note #166 Filename: MSDOS6.TEC
by Bill Burge CompuServe: MSDOS6.ZIP
Last revised: 11/1/93 Category: SW3
Subject: A discussion of MS-DOS version 6.0 and Quarterdeck products.
Q. Is MS-DOS 6 compatible with QEMM?
A. Absolutely! The Microsoft DOS 6 README.TXT file states that
"Quarterdeck's QEMM memory manager is compatible with MS-DOS
6." In addition, there are no known incompatibilities between
MS DOS 6.0 and Quarterdeck's DESQview or DESQview/X
multitaskers.
Q. As a QEMM user, what information do I need to install DOS 6?
A. As a QEMM user, the most important information that you can
take with you in the installation and configuration of
Microsoft DOS 6 is the knowledge that you are already running
the most effective memory management system available for the
IBM-compatible computer. If you are already using QEMM, follow
these steps:
1) Run the SETUP program from the DOS 6 installation diskette
and follow the instructions on the screen.
2) Install any of the new DOS 6 utilities that you desire. DOS
6 provides you the opportunity to add virus protection and
other utilities to your system. Remember: the default
installation of DOS 6 installs only the MS Windows versions
of these utilities; you have to tell it to install the DOS
versions as well. This is done on the Utilities screen of
the SETUP process.
3) Run QEMM's OPTIMIZE to load those drivers into Upper Memory.
If you should desire to experiment with Microsoft DOS 6's
MemMaker (the program that attempts to provide more memory),
we can recommend a couple of safeguards. MemMaker will
remove ALL the QEMM commands from your CONFIG.SYS and
AUTOEXEC.BAT files (with the exception of DOSDATA.SYS and
DOS-UP.SYS, which you would have to remove manually). We
are confident that you will want to return to Quarterdeck's
QEMM, so we urge you to save a copy of your CONFIG.SYS and
AUTOEXEC.BAT files. Before you begin to experiment, copy
these files from the root directory to some other directory
or to a floppy diskette. This will allow you to restore them
easily.
Our customers have reported problems related to running
MemMaker on multi-path CONFIG.SYS files. Unlike QEMM's
OPTIMIZE and QSETUP programs, MemMaker does not offer a
multi-CONFIG menu.
Next, be aware that even if you save the configuration
created by MemMaker, you can usually reverse its changes by
running MEMMAKER /UNDO. If the final screen of the MemMaker
process is NOT a numerical breakdown of how MemMaker got you
more memory (and every test that we have run says it will
not be), select the default exit by pressing the <ENTER>
key. Do NOT press F3 to save the current MemMaker
configuration.
Note that MemMaker does NOT handle CALLed batch files. A
CALLed batch file is executed with the DOS keyword "CALL"
which tells DOS to execute the commands in the "CALLed"
batch file and then resume executing the remaining commands
in the current batch file (the AUTOEXEC.BAT in this case).
The significance of this is that Quarterdeck's Optimize
process DOES handle CALLed batch files, loading any TSR's in
those batch files into Upper Memory instead of just ignoring
them. This means that when MemMaker deletes the QEMM
commands from the AUTOEXEC.BAT and CONFIG.SYS, it leaves
them in the Optimized, CALLed batch files. These would have
to be removed by editing the CALLed batch files and deleting
the LOADHI information. If NO changes have been made since
the last time that you Optimized your system, you could also
run UNOPT.BAT. UNOPT is a batch file, created by Optimize,
that returns your system to the condition it was in before
the most recent Optimize. If you have Optimized more than
once, use the OPTIMIZE /RESTORE parameter instead; this
allows you to restore any of your last nine configurations,
or the pre-QEMM configuration.
With the greater selection of features in QEMM and Optimize,
MemMaker does not stand a chance of creating more upper
memory. QEMM's Stealth ROM feature adds 96K of Upper Memory,
64K more than MemMaker's best attempt to find unused space
in your System BIOS. Optimize has the ability, through
Quarterdeck's Squeeze technology, to shoehorn TSR's and
device drivers into areas that are large enough for them to
reside, but too small for them to initialize. (It is common
for drivers and resident programs to require larger areas
during initialization than they need once they have loaded.)
Optimize has a "What-If" feature that lets you see the
effect that rearranging the loading order of your programs
and drivers will have on your memory usage WITHOUT making
any changes to your configuration. None of this is possible
with MemMaker.
Q. Are any of my Quarterdeck products affected by DoubleSpace (or
DriveSpace)?
A. The most talked-about feature of Microsoft DOS 6 is its disk
compression -- DriveSpace in DOS 6.22; DoubleSpace in earlier
releases of DOS 6. Both DoubleSpace and DriveSpace were
designed to be compatible with QEMM. Disk compression
utilities, including Stacker, XtraDrive, and now DoubleSpace,
have gone to great lengths to be compatible with Stealth ROM as
well as Optimize.
(In the following paragraphs, DBLSPACE is used to refer to
DBLSPACE or DRVSPACE.) DBLSPACE.BIN is a driver that allows
your system to recognize your DoubleSpace drive. It is loaded
by IO.SYS during boot time, BEFORE DOS has even thought about
loading QEMM. DBLSPACE.BIN uses about 43K of your memory, and
when the CONFIG.SYS has completed, the memory used by the
resident portion of DBLSPACE.BIN appears to be added to the
memory used by the LAST driver loaded in the CONFIG.SYS. In
other words, the last driver loaded appears to be 43K larger
than it actually is. When you install DoubleSpace, the
following line is added to your CONFIG.SYS file:
DEVICE=C:\DOS\DBLSPACE.SYS /MOVE
DBLSPACE.SYS has only one purpose, and that is to make
DBLSPACE.BIN appear as a "real" driver, separate in memory.
DoubleSpace REQUIRES that DBLSPACE.SYS be loaded in order for
any memory manager to load DBLSPACE.BIN into upper memory.
QEMM includes a feature called "Stealth D*Space," which
moves the DoubleSpace driver out of conventional or upper
memory and maps it into the expanded memory Page Frame whenever
it is needed. By using Stealth DoubleSpace you save
approximately 41K of memory. If DoubleSpace is installed on
your system when you install QEMM, the following line will be
added to your CONFIG.SYS file:
DEVICE=C:\QEMM\ST-DSPC.SYS
If you install DoubleSpace AFTER installing QEMM, you should
run QEMM's QSETUP program (by typing QSETUP at the DOS prompt).
QSETUP will remove the DBLSPACE.SYS line in your CONFIG.SYS and
replace it with the ST-DSPC.SYS line shown above.
The Stealth D*Space feature, like the Stealth ROM feature,
requires the presence of an EMS page frame. If you have used
QEMM386.SYS's FRAME=NONE; FRAMELENGTH=0, 1, 2 or 3; or EMS:N
parameter to eliminate the page frame, the ST-DSPC.SYS program
will act exactly like the DOS 6 driver DBLSPACE.SYS with its
/MOVE parameter: in other words, it will move DBLSPACE.BIN from
the top of conventional memory to low conventional memory. If
you choose to leave ST-DSPC .SYS in your CONFIG.SYS file
without a page frame, you can use O ptimize to load the
DoubleSpace driver into High RAM, just as you could with
DBLSPACE.SYS /MOVE.
Q. How can I restore my QEMM configuration after MemMaker has
removed QEMM from my CONFIG.SYS and AUTOEXEC.BAT files? REMOVED
QEMM FROM MY CONFIG.SYS AND AUTOEXEC.BAT FILES?
A. The steps that you must follow in order to return to QEMM after
running MemMaker depend on whether you have:
1. Not yet completed MemMaker; OR
2. Have completed MemMaker.
For the Number 1's who have not yet completed MemMaker:
When MemMaker completes and DOES NOT provide a better
configuration than the one you already had, it will tell you
"Your computer's memory was optimally configured before you ran
MemMaker". At this juncture you can press <ENTER> to restore
your original configuration or F3 to save the MemMaker
configuration. Your choice at this time will be <ENTER>. Your
existing QEMM configuration will be restored.
For the Number 2's who have completed MemMaker:
Since you have completed the MemMaker process, it has probably
become evident to you that nothing provides more upper memory
for loading your TSR's and device drivers than QEMM. Just type
QSETUP from the DOS prompt. QEMM's QSETUP program will remove
HIMEM.SYS and EMM386.EXE from your CONFIG.SYS file and replace
them with a QEMM386.SYS device line. From the QSETUP menu you
can also enable other options (such as QDPMI and DOS-UP.) Once
QSETUP has enabled the options you choose, run QEMM's Optimize
program to load your device drivers and TSR's into upper
memory. That is all there is to it.
Q. MemMaker does not support multi-path CONFIG.SYS files. Does
QEMM support this DOS 6 feature?
A. Yes -- much better than DOS 6's memory management programs.
DOS 6 provides the ability to build menus of configurations in
the CONFIG.SYS and AUTOEXEC.BAT. This is accomplished by
building "blocks" in the CONFIG.SYS, and having the name of the
block selection that you make on boot passed to the
AUTOEXEC.BAT as an environment variable -%config%. The use of
the environment variable, for IF's and GOTO's, will then
process a particular portion of the AUTOEXEC.BAT file that is
appropriate to that portion of the CONFIG.SYS.
Multiple configurations (as implemented via the CONFIG.SYS
blocks) have to be MemMakered one configuration at a time. The
DOS 6 documentation discusses the process of converting your
CONFIG.SYS and AUTOEXEC.BAT into multiple copies and then
MemMakering them one at a time. Microsoft warns users to avoid
[common] blocks and "first entries" in the AUTOEXEC.BAT.
If you are using QEMM however, you will find the process of
Optimizing a multi-config system much easier than with
MemMaker. QEMM's Optimize program handles multiple
configurations with ease. When you run Optimize, it will
detect any multiple configurations you have set up and will
post a message prompting you to choose the CONFIG.SYS
configuration you want to Optimize. (If Optimize is launched
automatically by the Install program or by QEMM Setup, these
programs will also detect multiple configurations and pass the
information along to the Optimize program.) Optimize will then
execute normally, booting the system with the configuration
that you have chosen.
When you are not using multiple configurations, Optimize places
the /R:n (REGION:n) parameter on lines that load TSRs and
device drivers to specify which High RAM region the driver or
TSR will load into. When you are using multiple
configurations, instead of placing /R:n parameters on the
QEMM386.SYS and LOADHI lines, Optimize will place /RF
(/RESPONSEFILE) parameters. The /R:n parameters would not work
in a multiple configuration situation, because a program might
be part of two or more CONFIG.SYS configurations, each
requiring a different region number.
The /RF parameter gets around this problem by directing
QEMM386.SYS and the LOADHI programs to look in a resource file
called LOADHI.RF that Optimize has created in the \QEMM
directory. (Optimize places a LOADHIDATA environment variable
in the CONFIG.SYS file that tells QEMM386.SYS and the LOADHI
programs the name and location of this resource file.)
LOADHI.RF will contain several "config blocks," each
corresponding to a CONFIG.SYS configuration and containing the
appropriate /R:n statements for that configuration. QEMM386.SYS
and the LOADHI programs check the current CONFIG environment
variable (created at boot time by DOS 6 to indicate which
CONFIG.SYS configuration is being used), and then choose the
appropriate config block to get information about what High RAM
region they should use to load high.
Here is an example of a resource file:
[Vanilla]
QEMM386.SYS /R:1
C:\DOS\SETVER.EXE /R:1
C:\DOS\COMMAND.COM /R:1
[Development]
QEMM386.SYS /R:1
C:\DOS\SETVER.EXE /R:1
C:\QEMM\QDPMI.SYS /R:1
C:\DOS\COMMAND.COM /R:1
[Full]
QEMM386.SYS /R:2
C:\DOS\SETVER.EXE /R:3
C:\QEMM\QDPMI.SYS /R:3
C:\DOS\COMMAND.COM /R:2
C:\PCKWIK\SUPERPCK.EXE /R:2
C:\NET\IPX.COM /R:1
C:\NET\EMSNETX.COM /R:2
[All Others]
QEMM386.SYS /R:1
C:\DOS\SETVER.EXE /R:1
C:\QEMM\QDPMI.SYS /R:1
C:\DOS\COMMAND.COM /R:1
C:\PCKWIK\SUPERPCK.EXE /R:2
In this example, the blocks named Vanilla, Development, and
Full will be used only when you choose their names off the menu
that DOS 6 offers when you boot with multiple configurations.
The All Others section will be used only if none of the blocks
before it were chosen. If you place a line before the first
block, it will be used no matter what configuration name you
choose.
This file format is also supported by QEMM's parameter files
(see Chapter 7 of the QEMM manual for information) and by the
DOS-Up resource file DOS-UP.DAT, which the driver DOS-UP.SYS
uses to determine where different parts of DOS go in High RAM.
Normally, you do not need to edit these files yourself.
Optimize creates and maintain the files.
Q. What else is Quarterdeck doing for DOS?
A. Quarterdeck's commitment to adding functionality to DOS and
DOS-based programs has kept our products at the forefront of
memory management and multitasking technology. With each new
version of DOS comes an opportunity for Quarterdeck to design
new features and offer the DOS user an even greater
implementation of the world's most widely used operating
system. Quarterdeck intends to continue this pattern.
******************************************************************
* Trademarks are property of their respective owners. *
* This and other technical notes may be available in updated *
* forms through Quarterdeck's standard support channels. *
* Copyright (C) 1996 Quarterdeck Corporation *
******************** E N D O F F I L E ***********************