# Command: fdxms

      FDXMS is an extended memory driver for FreeDOS.
      FDXMS is for 386+ computers. Fdxms286 is for 286 computers.
      FDXMS has to be loaded in CONFIG.SYS / FDCONFIG.SYS.

## Syntax:

      DEVICE=[drive][path]\fdxms.sys [options]
             drive  The drive letter, e.g. C:
             path   The directory, e.g. \example\

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## Options:

      NUMHANDLES=  Sets the number of XMS handles. Default is 32. Minimum
                   is two (not much use of XMS without any handles!) and
                   maximum is currently 1024. Each handle takes 5 bytes
                   (FDXMS.SYS) or 9 bytes (FDXXMS.SYS).
      BIOS         Makes FDXMS always call the BIOS through INT15
                   instead of using its own protected mode switching.
      PS           Changes to the particular A20 handling necessary on
                   PS/2 machines.
      GEODE        Removes delays while changing the A20 line. Reported
                   to help FDXMS to work on National Semiconductor's
                   Geode GX1 processor.
      DELAY=       Number of calls to the delay routine after changing
                   the A20 line. If you receive the error message "Unable
                   to switch A20 address line", try setting it to a big
                   value (say 4000) and see if it helps. Then fine tune
                   it as you want as low a value as possible for speed.
                   Default is 1. Maximum is 65535 and 0 maps to 65536.

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## Comments:

      FDXMS.SYS has to be loaded in CONFIG.SYS / FDCONFIG.SYS.
      FDXMS.SYS is out of date. You should use HIMEMX or JEMMEX
      instead.

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## Examples:

      IN CONFIG.SYS / FDCONFIG.SYS:
        device=c:\fdos\fdxms.sys

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## See also:

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

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## 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.

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      Copyright © 2003 Martin Stromberg, updated 2008 by W. Spiegl.

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