emm386(CMD) — OpenDesktop 3.0.0


 emm386(CMD)                     19 June 1992                     emm386(CMD)


 Name

    emm386 - enable or disable EMM386 expanded-memory support with an 80386
    or higher processor

 Syntax


    emm386 [on|off|auto] [w=on|w=off]

    To display the current status of EMM386 expanded-memory support, use the
    following syntax:

    emm386


 Description

    The emm386 command also enables or disables Weitek coprocessor support.

 Parameters


    on|off|auto   Activates the EMM386.EXE device driver (if set to on), or
                  suspends the EMM386.EXE device driver (if set to off), or
                  places the EMM386.EXE device driver in auto mode (if set to
                  auto). Auto mode enables expanded-memory support only when
                  a program calls for it.  The default value is on.

    w=on|w=off    Enables or disables Weitek coprocessor support.  The
                  default value is w=off.


 Notes


    Installing the EMM386.EXE device driver

    You must use the device command to install the EMM386.EXE device driver
    before you can use the emm386 command. To use the EMM386.EXE device
    driver and the emm386 command, your computer must have an 80386 or higher
    processor.  If you try to use the emm386 command on a computer that does
    not have an 80386 or higher processor, MS-DOS displays the following mes-
    sage:

       EMM386 driver not installed


    Reactivating EMM386 expanded-memory support

    If EMM386.EXE was loaded when MS-DOS started but is not currently in use,
    the on parameter reactivates expanded-memory support.

    Suspending EMM386 expanded-memory support

    If EMM386 expanded-memory support is currently active, handle 0 is the
    only handle allocated, and EMM386.EXE is not providing access to the
    upper memory area, then the off parameter suspends EMM386 expanded-memory
    support.  When EMM386 expanded-memory support is off, the
    Lotus/Intel/Microsoft Expanded Memory Specification (LIM EMS) header is
    changed so that programs cannot use expanded memory.

    Enabling and disabling weitek coprocessor support

    If the w=on parameter is specified and the off parameter (different from
    the w=off parameter) is not,  EMM386 enables Weitek coprocessor support.
    The high memory area (HMA) must be available to enable Weitek coprocessor
    support.

    If you specify the w=on or w=off parameter and no Weitek coprocessor is
    installed in your computer system, MS-DOS displays the following error
    message:

       Weitek Coprocessor not installed
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