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sysini2.txt
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1991-07-29
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SYSINI2.TXT
-----------
NOTE: This is the second of four files containing
information about the SYSTEM.INI file. For general
information about SYSTEM.INI and the listings in
this file, read the introductory material in the
SYSINI.TXT file.
WARNING: If you change a setting incorrectly in
SYSTEM.INI, you might disable your system. Before
changing any setting, read "Changing Settings"
in the SYSINI.TXT file.
------------------------------------------------------------
------------------------------------------------------------
[386ENH] SECTION
The [386Enh] section contains information specific to
running Windows in 386 enhanced mode, including information
used for virtual-memory page swapping.
The [386Enh] section can contain the following settings:
------------------------------------------------------------
AllVMsExclusive=<Boolean>
Default: false
Purpose: If enabled, this setting forces all applications
to run in exclusive full-screen mode, overriding
all contrary settings in the applications'
program information files (PIFs). Enabling this
setting might prolong the length of the Windows
session when you are running network and memory-
resident software that is incompatible with
Windows.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
AltKeyDelay=<seconds>
Default: .005
Purpose: Specifies how much time Windows waits to process
a keyboard interrupt after it processes an ALT
interrupt. Some applications expect a slower
processing rate than Windows in 386 enhanced mode
normally uses. Increase this value if such an
application has trouble handling the ALT key.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
AltPasteDelay=<seconds>
Default: .025
Purpose: Specifies how much time Windows waits before
pasting any characters after the ALT key has been
pasted. Some applications may require more time
for recognition of the ALT keystroke.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
CGA40WOA.FON=<filename>
Default: none
Purpose: Specifies the filename of the fixed-pitch display
font used for non-Windows applications with a
display of 40 columns and 25 or fewer lines.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
CGA80WOA.FON=<filename>
Default: none
Purpose: Specifies the filename of the fixed-pitch display
font used for non-Windows applications with a
display of 80 columns and 25 or fewer lines.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
CGANoSnow=<Boolean>
Default: no
Purpose: If enabled, causes Windows to do special handling
to avoid snow appearing on an IBM CGA display
device.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
COM1AutoAssign=<seconds>
COM2AutoAssign=<seconds>
COM3AutoAssign=<seconds>
COM4AutoAssign=<seconds>
Default: 2
Purpose: Indicate the contention detection values for each
connected communications port. These values are
used by Windows to determine how to arbitrate
requests for the use of a device by more than one
application, at least one of which is a non-
Windows application. If the value is -1, Windows
will display a warning message that asks you
which application should be given control of the
port. If the value is zero, any application can
use the device at any time. If the value is a
positive integer less than 1,000, this value
represents the number of seconds after an
application stops using the device before another
application can use the same device.
To change: Choose the 386 Enhanced icon from the Control
Panel window.
------------------------------------------------------------
COM1Base=<port>
COM2Base=<port>
COM3Base=<port>
COM4Base=<port>
Default: COM1Base=3F8h; COM2Base=2F8h; COM3Base=2E8h;
COM4Base=2E0h
Purpose: Specifies the base (first) port for the serial
port adapter you are using. Check you hardware
documentation for the appropriate value.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
COMBoostTime=<milliseconds>
Default: 2
Purpose: Specifies the amount of time (in milliseconds) to
allow a virtual machine to process a COM
interrupt. If a communications application is
losing keyboard characters on the display, you
can try increasing this value.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
COM1Buffer=<characters>
COM2Buffer=<characters>
COM3Buffer=<characters>
COM4Buffer=<characters>
Default: 128
Purpose: Specifies the number of characters that will be
buffered by the device on the corresponding
communications port. Before changing one of these
settings, make sure the corresponding
COMxProtocol setting has the proper value.
Buffering may slow down communications on a port,
but might be necessary to prevent some
communications applications from losing
characters at high baud rates. The size of the
buffer required will depend on the speed of the
machine and the application's needs. Before
increasing this value, see the COMxProtocol
setting.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
COM1Irq=<number>
COM2Irq=<number>
COM3Irq=<number>
COM4Irq=<number>
Default: COM1Irq=4; COM2Irq=3; COM3Irq=4; COM4Irq=3
Purpose: Specifies which interrupt line is being used by
the device on the specified communications port.
Check your hardware documentation for the
appropriate value. Setting a value to -1 disables
input for that COM port. You would do this only
if there is a hardware conflict between ports.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
COMIrqSharing=<Boolean>
Default: true for Micro Channel (TM) and EISA machines;
false for all other machines
Purpose: Specifies whether COM IRQs will be sharable
between mulitiple communications ports or with
other devices. Enable this switch if your machine
uses the same interrupt for COM3 or COM4 as it
does for COM1 or COM2.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
COM1Protocol=<XOFF-or-blank>
COM2Protocol=<XOFF-or-blank>
COM3Protocol=<XOFF-or-blank>
COM4Protocol=<XOFF-or-blank>
Default: (Default is no entry, which is the same as any
entry other than XOFF)
Purpose: Specifies whether Windows in 386 enhanced mode
should stop simulating characters into a virtual
machine after the virtual machine sends an XOFF
character. Set the value for a port to XOFF if a
communications application using that port is
losing characters while doing text transfers at
high baud rates. Windows will resume simulating
characters when the virtual machine sends another
character after the XOFF character. Leave this
setting disabled if the application is doing
binary data transfers; enabling this switch might
suspend binary transmissions. Windows will not
check for XOFF characters if this setting is
blank or set to anything other than XOFF. If the
application continues to lose characters after
this setting is properly set, try increasing the
corresponding COMxBuffer value.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
Device=<filename-or-*devicename>
Default: none (Setup assigns appropriate values based on
your system configuration.)
Purpose: Specifies which virtual devices are being used
with Windows in 386 enhanced mode. This value can
appear in two ways: either the name of a specific
virtual device file, or an asterisk (*) followed
immediately by the device name. The latter case
refers to a virtual device that is in the
WIN386.EXE file. Synonyms for Device= are
Display=, EBIOS=, Keyboard=, Network=, and
Mouse=. Filenames usually include the .386
extension. Multiple device lines are required to
run Windows in 386 enhanced mode.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
Display=<filename-or-*devicename> (See "Device=", above)
Default: none (Setup assigns an appropriate value based on
your system configuration.)
Purpose: Specifies the display device that is being used
with Windows in 386 enhanced mode. This setting
is a synonym for Device=.
To change: Choose the Windows Setup icon from the Main
Group window.
------------------------------------------------------------
DMABufferIn1MB=<Boolean>
Default: no
Purpose: Indicates, if enabled, that the direct memory
access (DMA) buffer memory should be in the first
1MB of memory (above 640K, if possible) in order
to be compatible with 8-bit bus master cards.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
DMABufferSize=<kilobytes>
Default: 16
Purpose: Specifies the amount of memory (in kilobytes) to
be reserved for buffered direct memory access
(DMA). This memory will be allocated above 640K,
if possible. Windows in 386 enhanced mode will
default to a DMA buffer size that will handle
disk access.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
DualDisplay=<Boolean>
Default: See "Purpose."
Purpose: Normally, when running in 386 enhanced mode, the
memory between B000:0000 and B7FF:000F will be
used by the general system unless a secondary
display is detected. If this setting is enabled,
this memory will be left unused and available for
display adapters. If this setting is disabled,
the address range will be available on EGA
systems but not under VGA systems, since the VGA
display device supports monochrome modes, which
use this address space.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
EBIOS=<filename-or-*devicename> (See "Device=", above)
Default: none (Setup assigns an appropriate value based on
your system configuration.)
Purpose: Specifies the extended BIOS device that is being
used with Windows in 386 enhanced mode. This
setting is a synonym for Device=.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
EGA40WOA.FON=<filename>
Default: none
Purpose: Specifies the filename of the fixed-pitch display
font used for non-Windows applications with a
display of 40 columns and more than 25 lines.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
EGA80WOA.FON=<filename>
Default: none
Purpose: Specifies the filename of the fixed-pitch display
font used for non-Windows applications with a
display of 80 columns and more than 25 lines.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
EISADMA=<Boolean> or <channel>,<size>
Default: 0,8; 1,8; 2,8; 3,8; 5,16w; 6,16w; 7,16w (Each
pair goes with its own EISADMA setting.)
Purpose: Specifies the mode of operation of an extended
DMA channel for Extended Industry Standard
Architecture (EISA) machines only. This
setting's value can take one of two forms. If
you disable this setting, Windows will treat the
machine as non-EISA, therefore avoiding all EISA-
related logic. You can try disabling this switch
if you cannot run Windows in 386 enhanced mode
on your EISA machine. If you are using an EISA
machine, you can specify the default transfer
size for one or more DMA channels. The channels
can operate in the following modes: 8-bit (8),
16-bit specified in words (16w), 16-bit specified
in bytes (16b), or 32-bit (32). If you are not
using an EISA machine, Windows will ignore this
setting.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
EMMExclude=<paragraph-range>
Default: none
Purpose: Specifies a range of memory that Windows will not
scan to find unused address space. This has the
side effect of turning off the RAM and ROM search
code for the range. The range (two paragraph
values separated by a hyphen) must be between
A000 and EFFF. This scanning can interfere with
some adapters that use the same memory area. The
starting value is rounded down and the ending
value is rounded up to a multiple of 16K. For
example, you could set EMMExclude=C800-CFFF to
prevent Windows from scanning the addresses
C800:0000 through CFFF:000F. You can specify more
than one range by including more than one
EMMExclude line.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
EMMInclude=<paragraph-range>
Default: none
Purpose: Specifies a range of memory that Windows will
scan for unused address space regardless of what
may be there. EMMInclude takes precedence over
EMMExclude if you specify ranges that overlap.
The range (two values separated by a hyphen) must
be between A000 and EFFF. The starting value is
rounded down and the ending value is rounded up
to a multiple of 16K. For example, you could set
EMMInclude=C800-CFFF to ensure that Windows scans
the addresses C800:0000 through CFFF:000F. You
may specify more than one range by including more
than one EMMInclude line.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
EMMPageFrame=<paragraph>
Default: none
Purpose: Specifies the starting paragraph where the 64K
page frame will begin when Windows in 386
enhanced mode cannot find a suitable page frame.
Allows an EMM page frame in an area containing
some unused RAM or ROM. For example, you could
set EMMPageFrame=C400 to start the page frame at
C400:0000.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
EMMSize=<kilobytes>
Default: 65,536
Purpose: Specifies the total amount of memory to be made
available for mapping as expanded memory. The
default allocates the maximum possible amount of
system memory as expanded memory. You should
specify a value for this setting if you run an
application that allocates all of the available
expanded memory. This will be apparent if, when
you run the application, you can never create any
new virtual machine. If this value is zero, then
no expanded memory will be allocated, but the EMM
driver will be loaded. This setting does not
prevent the EMM driver from being loaded; use the
NoEMMDriver to disable EMM.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
FileSysChange=<Boolean>
Default: on (But in a standard SYSTEM.INI file, Setup will
set FileSysChange=off, disabling this
setting.)
Purpose: Indicates whether File Manager will automatically
receive messages any time a non-Windows
application creates, renames, or deletes a file.
When this setting is disabled, a virtual machine
can be run exclusively even when it manipulates
files. Enabling this setting can slow down system
performance significantly.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
Global=<device-name>
Default: (all devices)
Purpose: Defines DOS devices loaded in CONFIG.SYS that
need to be global to the system. The default
setting for all devices is global. But certain
virtual devices might specify that a DOS device
be local (for example, MS$MOUSE). Use this
setting to override that local specification. The
<device-name> value must exactly match the case
of the device name, or this setting will not
work. (Most device names are in all captial
letters, therefore this value must usually be in
all caps.)
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
HighFloppyReads=<Boolean>
Default: yes
Purpose: Normally, Windows turns a DMA verify to the
area E000:0000-EFFF:000F into a read in order to
work around problems with certain machines. In
rare cases, this might cause the system to fail
because some software might, as a result, write
over the system's shadow RAM if you have it in
this area. If this happens, disable this setting
and set EMMExclude to E000-EFFF.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
IgnoreInstalledEMM=<Boolean>
Default: no
Purpose: If enabled, this setting allows Windows to start
in 386 enhanced mode even when there is an
unknown expanded memory manager (EMM) running.
This can cause the system to fail if memory-
resident software was using EMM before Windows
started. Enable this setting only if no such
software is installed or you are sure it will not
be active when you are running Windows. This
setting applies only to expanded memory managers
servicing physical EMS hardware; Windows will not
disable unrecognized 80386 expanded memory
emulators.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
InDOSPolling=<Boolean>
Default: no
Purpose: If enabled, prevents Windows from running other
applications when memory-resident software has
the InDOS flag set. Enabling this setting is
necessary if the memory-resident software needs
to be in a critical section to do operations off
an INT21 hook. Enabling this setting will slow
down system performance slightly.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
INT28Critical=<Boolean>
Default: true
Purpose: Specifies whether a critical section is needed to
handle INT28h interrupts used by memory-resident
software. Some network virtual devices do
internal task switching on INT28h interrupts.
These interrupts might hang some network
software, indicating the need for an INT28h
critical section. If you are not using such
software, you might improve Windows' task
switching by disabling this setting.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
IRQ9Global=<Boolean>
Default: no
Purpose: If enabled, converts IRQ9 masks to global. Enable
this setting if your system hangs when your
system touches a floppy drive. Or make sure your
system touches the floppy drive before starting
Windows.
To change: Use Notepad to edit the SYSTEM.INI file.
------------------------------------------------------------
NOTE: See the SYSINI3.TXT file for the remainder of the
[386Enh] section listings.
----------
Micro Channel is a trademark of International Business
Machines Corporation.