# Command: jemmex

      JEMMEX is an Expanded Memory Manager which has an XMM already included.
      JEMMEX has to be loaded in CONFIG.SYS / FDCONFIG.SYS.

## Syntax:

      DEVICE=[drive][path][jemmex.exe] [options]
             drive  The drive letter, e.g. C:
             path   The directory, e.g. \example\
      or run it from the command line:
      [drive][path][jemmex.exe] [options]

#### [Main menu] [top] (Syntax) [Options] [Comments] [Examples] [See also] [File]

## Options:

     +A20/NOA20     A20-disable emulation on/off (default on).
      A20METHOD:m   Set A20 switch method. Possible values for m are
                    KBC, PS2, BIOS, FAST, PORT92 and ALWAYSON.
      ALTBOOT       Use alternate reboot strategy.
      B=####        Specify lowest segment address for EMS banking
                    (default=4000).
      D=###         Set DMA buffer size in kB (default=64, max is 128).
      EMX           Increased EMX DOS extender compatibility.
      FASTBOOT      Fast reboot. Requires JemmEx to be loaded in CONFIG.SYS.
      FRAME=E000    Set EMS page frame (FRAME=NONE disables frame). Any value
                    between 8000 and E000 is accepted, but not all will work.
      HMAMIN=n      Set minimum amount in Kb to allocate the HMA.
      I=D000-D7FF   Force a region to be used for UMBs. Without this option
                    range C000-EFFF is scanned for unused pages. May also
                    be used to add (parts of) regions A000-BFFF or F000-F7FF
                    as UMBs. Don't use this option if you don't know what you
                    are doing!
      I=TEST        Scan ROMs for unused pages, include found regions as UMBs.
      [MAX=]#####   Limit for VCPI (and EMS if < 32M) memory in kB
                    (default 120 MB).
      MAXEXT=n      Limit extended memory usage to n kB.
      MIN=#####     Reserve up to ##### kB for EMS/VCPI memory on init
                    (default=0).
      NOCHECK       Disallow access to address space without RAM (MMIO).
      NOE801        Don't use Int 15h, E801h to get amount of ext. memory.
      NOE820        Don't use Int 15h, E820h to get amount of ext. memory.
      NOEMS         Disable EMS handling.
      NODYN         No dynamic XMS memory allocation (use MIN= to set fix
                    amount).
      NOHI          Don't move resident part into first UMB.
      NOINVLPG      Don't use INVLPG opcode.
     +PGE/NOPGE     Page Global Enable feature usage on/off (default off).
      RAM/NORAM     Try to supply UMBs on/off (default on).
      S=D000-D7FF   Assume Shadow-RAM activated by UMBPCI, include it as UMB
      SB            SoundBlaster driver compatibility mode
      SPLIT         Regain partially used EPROM 4k pages for UMBs.
     +VCPI/NOVCPI   VCPI Support on/off (default on).
      VDS/NOVDS     Virtual DMA Services on/off (default on).
     +VME/NOVME     V86-Mode Extensions on/off (default on).
      VERBOSE       Display additional details during start (abbr: /V).
      X=D000-D7FF   Exclude region from being touched or used by JemmEx.
      X=TEST        Scan memory region C000-EFFF for UMB exclusion.
      X2MAX=n       Max. value in Kb for XMS V2 free memory report
                    (default=65535).
      XMSHANDLES=n  Number of available XMS handles (8<=n<=128, default=32).
      /?            Shows the help.

     '+': option can be set dynamically by running JemmEx from the command
          line.
      When invoked from the command line JemmEx additionally will understand:
      LOAD          install
      UNLOAD        uninstall

#### [Main menu] [top] [Syntax] (Options) [Comments] [Examples] [See also] [File]

## Comments:

      JEMMEX requires a 80386+ CPU. Load JEMMEX as DEVICE=JEMMEX.EXE in
      CONFIG.SYS (although it is an ".exe"-file!
      JEMMEX has to be loaded in CONFIG.SYS / FDCONFIG.SYS.
      JEMMEX most likely is the better choice than HIMEMX / JEMM386 because
      it will need less DOS memory than an external XMM + JEMM386.

#### [Main menu] [top] [Syntax] [Options] (Comments) [Examples] [See also] [File]

## Examples:

      IN CONFIG.SYS / FDCONFIG.SYS:
        device=c:\fdos\bin\jemmex.exe

#### [Main menu] [top] [Syntax] [Options] [Comments] (Examples) [See also] [File]

## See also:

      config.sys
      devload
      emm386
      fdconfig.sys
      fdxms
      fdxms286
      himem
      himemx
      jemm386

#### [Main menu] [top] [Syntax] [Options] [Comments] [Examples] (See also) [File]

## File:

      Please read this command's lsm file also.
      You will find the updated version (internet) here and
      the version described in this manual page here.
      The lsm file contains information about the name of the programmer,
      the download site, and some other command related information.

#### [Main menu] [top] [Syntax] [Options] [Comments] [Examples] [See also] (File)

      Copyright © 2008 W. Spiegl.

      This file is derived from the FreeDOS Spec Command HOWTO.
      See the file H2Cpying for copying conditions.