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1990-08-30
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ID:CT QRAM and C&T NEAT Chip Set
Quarterdeck Technical Note
by Daniel Travison
This technical note discusses a very specific configuration,
systems implementing the NEAT Chip Set and an EMS driver that
does not provide mappable areas other than the page frame.
Typically, QRAM is placed in your CONFIG.SYS file on a line AFTER
your EMS driver. When the system is rebooted, QRAM reports
"Nothing useful to do." On a system that contains the NEAT Chip
set, QRAM can use the system's shadow RAM feature to provide High
Ram. The objective is to allow QRAM to use the Shadow RAM
provided by the NEAT Chip Set while allowing the EMS driver to
provide expanded memory with a page frame. The key to making
this setup work is to have QRAM exclude the area the EMS driver
uses for the page frame and also load QRAM BEFORE the EMS driver.
STEP 1: Boot your system with your EMS driver in your CONFIG.SYS file.
STEP 2: Run Manifest (MFT.EXE) and display the First-Meg/Overview screen.
You will see something similar to the following map:
Memory Area Size Description
0000 - 003F 1K Interrupt Area
0040 - 004F 0.3K BIOS Data Area
0050 - 006F 0.5K System Data
0070 - 0B7C 44K DOS
0B7D - 21AF 88K Program Area
21B0 - 9FFF 506K [Available]
═══Conventional memory ends at 640K════
A000 - AFFF 64K VGA Graphics
B000 - B7FF 32K Unused
B800 - BFFF 32K VGA Text
C000 - C7FF 32K Video ROM
C800 - D000 32K Unused
--->D000 - DFFF 64K Page Frame <--- Page Frame address
E000 - EFFF 64k Unused
F000 - FFFF 64K System ROM
NOTE: Manifest is located in the directory where QRAM is installed.
Manifest is started by typing MFT.
STEP 3: Locate the entry for the page frame. If you do not see it, you
may not have your EMS driver installed in your system. Refer to
the documentation that came with the system for information on
installing the EMS driver. Most EMS drivers have the letters EMM
or EMS in their file name.
STEP 4: Record the starting and ending address of the page frame. For
example: The memory map above shows the page frame starting at
D000 and ending at DFFF. Your system may have the page frame
using some other address range. This is the address range you
will need to have QRAM exclude.
STEP 5: This step involves editing your CONFIG.SYS file. You can use any
editor of your choice as long as it is capable of saving files in
an ASCII format. Many word processors also have this capability.
The documentation may refer to them as TEXT, ASCII, or
NON-DOCUMENT files. If you are not sure, or do not have an editor
or word processor, read the chapter in your DOS manual on using
EDLIN. This editor is provided with DOS and can be used to edit
the CONFIG.SYS file. Your CONFIG.SYS file will be located in
the root directory of the drive the system boots from.
a: Determine where the QRAM.SYS file is located. The install program
will place it in the C:\QRAM unless you specified something else.
b: Add a device statement for QRAM in your CONFIG.SYS file. This
must be placed on a line BEFORE your EMS driver. The device
statement will need an EXCLUDE parameter to tell QRAM not to use
the area the EMS driver needs for the page frame. (refer to your
Manifest First-Meg/Overview screen for the page frame addresses).
For example: if QRAM is installed in the C:\QRAM subdirectory and
the page frame is using the address range D000-DFFF as shown
above, your device statement for QRAM will look like the
following:
DEVICE=C:\QRAM\QRAM.SYS EXCLUDE=D000-DFFF
c: Reboot the computer and watch for the QRAM sign-on display. If
QRAM is successful, it will report the areas of High RAM it
creates. You may now run OPTIMIZE to get your resident programs
and drivers loaded into the high RAM.
NOTES: This may also be useful for systems with the NEAT Chip Set and EMS
drivers that DO provide mappable areas other than the page frame.
To determine if you will benefit, perform the steps above and run
Manifest when complete. You may find this approach allows QRAM to
create more High RAM areas using shadow ram.
Copyright (C) 1990 by Quarterdeck Office Systems
* * * E N D O F F I L E * * *