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1991-05-23
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ID:CT QRAM and C&T NEAT Chip Set
Quarterdeck Technical Note #146
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 vice 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) 1991 by Quarterdeck Office Systems
* * * E N D O F F I L E * * *