Microsoft KB Archive/83387

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Windows 3.1 SYSTEM.INI [standard] Section

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Q83387

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The information in this article applies to:


 * Microsoft Windows versions 3.1, 3.11

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SUMMARY
The information contained in this article is taken from the SYSINI.WRI file contained in the Microsoft Windows Resource Kit for the Windows operating system version 3.1. The SYSINI.WRI file may be viewed with Windows Write.

The [standard] section of the SYSTEM.INI file contains settings that are specific to running Windows in standard mode.

MORE INFORMATION
The [standard] section can contain the following settings:

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FasterModeSwitch=<0-or-1>

Default: 0 Purpose: Enabling this setting causes Windows running in          standard mode to use a faster method of switching from protected to real mode on many 80286-based computers. When this setting is enabled, Windows responds quicker to hardware interrupts, allowing better throughput for interrupt-intensive applications, such as communications applications. In addition, you should enable this setting if you are using a Zenith Z-248 system and are losing characters while typing, or if you are using an         Olivetti M-250-E and lose control of the mouse.

Note: This setting has no affect on 80386-based computers. Some early IBM-AT and compatible computers do not have the BIOS support necessary to use this setting. Enabling this setting on these computers may cause them to hang when starting Windows.

To change: Use Notepad to edit the SYSTEM.INI file.

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Int28Filter=

Default: 10 Purpose: Specifies the interval of INT28h interrupts, generated when the system is idle, that are made visible (or reflected) to software that is loaded before Windows. Windows will reflect every nth interrupt, where n is the value of this setting. For example, a value of 1 reflects every INT28h interrupt, a value of 2 reflects every second INT28h interrupt, a value of 3, every third INT28h interrupt, and so on. Increasing this value might improve Windows' performance, but may interfere with some memory-resident software such as a         network. Set this value to 0 to prevent any INT28h interrupts from being reflected. Setting this value too low (from 1 to 9) might interfere with communications applications. To change: Use Notepad to edit the SYSTEM.INI file.

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MouseSyncTime=

Default: 500 Purpose: Specifies the number of milliseconds that can elapse between mouse data bytes before Windows running in standard mode assumes that a mouse data packet is complete. This setting only affects Windows running standard mode on computers with an         IBM PS/2 mouse interface. To change: Use Notepad to edit the SYSTEM.INI file.

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NetHeapSize=

Default: 8 Purpose: Specifies the size (in kilobytes) of the data- transfer buffer that standard-mode Windows allocates in conventional memory for transferring data over a network. If an application is not running correctly, your network may require a         larger buffer than the default. Increasing this value will decrease the amount of memory available to applications. If no network software is         running, this setting will be ignored and no          memory will be allocated. To change: Use Notepad to edit the SYSTEM.INI file.

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PadCodeSegments=<0-or-1>

Default: 0 Purpose: Setting this value to 1 causes Windows kernel to          pad code segments with 16 bytes. This will prevent the last instruction in the segment from being too close to the segment limit for 80286 C2 stepping. Set this value to 1 if your 80286 system hangs in         standard mode. To change: Use Notepad to edit the SYSTEM.INI file.

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Stacks=

Default: 12 Purpose: Specifies the number of interrupt reflector stacks used by the standard mode MS-DOS Extender (DOSX). Interrupt reflector stacks are used when the MS- DOS Extender needs to map a DOS or BIOS API from real mode to protected mode. If you receive a         &quot;Standard Mode: Stack Overflow&quot; message, try increasing the number. You can specify a number between 8 and 64. To change: Use Notepad to edit the SYSTEM.INI file.

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StackSize=

Default: 384 Purpose: Specifies the size of the interrupt reflector stacks used by the standard mode MS-DOS Extender. To change: Use Notepad to edit the SYSTEM.INI file. (You           should never need to change this setting.)

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