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Cream of the Crop 1
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UTILITY
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DRDOSTIP.ARJ
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1991-03-15
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GETTING ACQUAINTED WITH UPPER MEMORY
For one to be able to make effective decisions about the use
of upper memory, one has to understand the dynamics of how the
operating system, the LIM page frame, and other programs function
in that memory area. To learn about the workings of upper memory,
complete the following steps:
1. Either make a print out of CONFIG.SYS using TYPE
CONFIG.SYS > PRN or make a backup copy using COPY CONFIG.SYS
CONFIG.SAV. Edit the CONFIG.SYS file so that all the EMM386
options are set to "NONE". Also set HIDOS=OFF. These settings
will simplify the activity in upper memory. Reboot the system and
load the MEMMAX software. Open the upper memory area with the
command MEMMAX +U. Use MEM /A (/P) to look at the sections of
upper memory that are available. They will be displayed as "UPPER
RAM." It may be useful to print out this display by using the
command MEM /A > PRN.
2. Return to CONFIG.SYS and change the option for EMM386 to
/F=AUTO. This will create a LIM page frame in upper memory.
Reboot the system, open the upper memory with MEMMAX +U, and use
MEM /A (/P) to see where the LIM page frame was created.
3. Try loading a device driver like CACHE.SYS or memory
resident program (sometimes called a TSR or pop-up program) into
upper memory using either HIDEVICE= in CONFIG.SYS or HILOAD from
the command line. Open the upper memory and find where the driver
or program loaded.
4. Return to CONFIG.SYS and set the option for EMM386 back
to /F=NONE, reboot, and load the same device driver or program
used in step 3. Look at its current location. Depending on the
size of the driver or program, it may be located in a different
area than step 3 because the LIM page frame is no longer occupy-
ing upper memory.
5. Experiment with loading several things (LIM page frames,
device drivers, programs, etc) in upper memory and observe how
they are dynamically rearranged.
6. Return to CONFIG.SYS and set HIDOS=ON. This will change
how memory is allocated at bootup. This will allow DR DOS 5.0 to
move as much of the operating system data structures and as many
of the disk buffers as possible to upper memory after CONFIG.SYS
has been completed. Reboot, open the upper memory, and look at
upper memory usage. See if there any memory areas left that are
large enough to hold a program that you wish to load into upper
memory. If there is not a large enough area, one should try using
HIINSTALL= in CONFIG.SYS to load the desired program(s) into
upper memory BEFORE the data structures and disk buffers are
moved to that area.
7. When you have experimented enough to feel confident in
understanding the dynamics of upper memory usage, restore
CONFIG.SYS to its original settings and tailor the system to
match your specific needs.ustom Toolbox allows users to automate repetitive tasks and
customize the tools and the tool