Microsoft KB Archive/65443

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Enhanced EMM386.SYS Parameters for Windows 3.0

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Q65443

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The information in this article applies to:


 * Microsoft Windows versions 3.0, 3.0a

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SUMMARY
This article describes the syntax and parameters to use when loading EMM386.SYS from a device line in the CONFIG.SYS file.

MORE INFORMATION
As a device driver, EMM386.SYS must be loaded from a device line in CONFIG.SYS using the following syntax

  device=[drive][path]EMM386.SYS [AUTO | ON | OFF] [SIZE] [W=ON | W=OFF] [Mx|FRAME=mmmm|/Pmmmm] [Pn=mmmm] [X=mmmm-nnnn] [B=mmmm] [L=n] [A=n] [/Hnnn] [D=nnn] where the following is true:

[AUTO|ON|OFF]
This indicates the state of the machine when the driver returns to DOS. AUTO is the default and means that the driver is loaded and listening, but the machine is left in real mode until the first Int 67h call is seen. Thus, we say the driver is inactive. The driver stays active with the machine in virtual mode as long as a handle is allocated. Loading a TSR that allocates EMS causes the driver to become permanently active.

ON indicates the machine is always in virtual mode and the driver is always active. OFF indicates that the machine stays in real mode and the driver in inactive. All Int 67h calls will fail when in this mode.

[SIZE]
This is the amount of system memory measured in kilobytes to be reserved for the common memory pool to be available as expanded memory or VCPI memory. The amount defaults to 256K of system memory that is not already allocated. If there is not enough memory available to provide SIZE kilobytes of expanded memory, EMM386 will adjust SIZE.

[W=ON|W=OFF]
This enables or disables the Weitek Coprocessor Support. The default value is OFF.

[Mx|FRAME=mmmm|/Pmmmm]
Any one of these methods may be used to specify the location of the EMS 3.2 compatible page frame. This must be four contiguous pages to be compatible with EMS 3.2. It is not required that this parameter be specified because EMM386 will select a 64K contiguous region as a default. The default will be chosen by looking at E000h at each segment until C000h. The default will not be placed below C000h. These parameters are provided because it is not possible to absolutely identify adapter memory in all cases. When a conflict occurs, you must force the page frame to some known location.

mmmm - is a segment address between 4000h and EC00h inclusive

Mx - allows you to specify the base address of the 64K page frame The following is an example:

     M1 = C000h      M8 = DC00h M2 = C400h     M9 = E000h M3 = C800h     M10 = 8000h* M4 = CC00h     M11 = 8400h* M5 = D000h     M12 = 8800h* M6 = D400h     M13 = 8C00h* M7 = D700h     M14 = 9000h* * Options M10 through M14 may require you to configure memory to       have 512K or less.

FRAME=mmmm - allows you to directly specify the segment base /Pmmmm - is a synonym for /FRAME

[Pn=mmmm]
This argument lets you define the segment of a specific page. Page (n) gets placed at mmmm. If Mx or FRAME is specified, then Pn is not allowed.

[X=mmmm-nnnn]
This argument lets you specify a segment address range that cannot be used for an EMS page.

[B=mmmm]
This allows you to specify the lowest segment address. Default is B:4000h, but mmmm can range from 1000h to EC00h inclusive.

[L=n]
This allows you to specify the minimum amount of extended memory available after EMM386 is loaded. n is the number of 1K blocks.

[A=n]
This allows you to specify the number of fast alternate register sets to allocate, where n is the number of fast register sets to allocate. The default is A=7.

[/Hnnn]
This allows you to specify the number of handles available for use from 1 to 255. The default is /H255.

[/D=nnn]
This argument specifies the amount of memory to be reserved for buffering DMA operations. nnn is measured in kilobytes to allocate for DMA. Valid parameters are { 16 <= nnn >= 256}. This parameter should reflect the largest DMA transfer that can occur while the driver is active.

Additional query words: 3.00 3.0 3.0a 3.00a winmem win30

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Technology : kbWin3xSearch kbWin300 kbWin300a