FreeDOS help system (hhstndrd 1.0.8 en)[emm386]

Command: emm386

EMM386 is the Expanded Memory Manager. EMM386 has to be loaded in CONFIG.SYS / FDCONFIG.SYS. EMM386 is out of date. You should use HIMEMX / JEMM386 or JEMMEX instead.

Syntax:

DEVICE=[drive][path][EMM386.EXE] [options] drive The drive letter, e.g. C: path The directory, e.g. \example\ or run it from the command line: [drive][path][emm386.exe] [options]

Options:

ALTBOOT Hook keyboard interrupt for reboot processing. EMM=##### Reserve up to #####K for only EMS/VCPI memory. FRAME=E000 Select wanted pageframe for EMS. I=hhhh:hhhh Use memory that is reserved for some devices. E.g: I=A000-AFFF (VGA graphics) I=B000-B7FF (Hercules graphics) Use I=hhhh:hhhh to force UMB over other areas. I=TEST Test ROM locations for UMB inclusion. MAX=##### Maximum available VCPI memory in K; also EMS if < 32M. MEMCHECK Access to full 4G address space without RAM (MMIO). NOALTBOOT Do not hook keyboard interrupt for reboot processing (default). NOCHECK Disallow access to address space without RAM (MMIO). NODISABLEA20 Do not allow EMM386 to disable A20. NOEMS Do not enable expanded memory. Use NOEMS to get more free UMBs if you need no EMS. NOVCPI Do not use VCPI (must be used with NOEMS). NOVDS Disable Virtual DMA Services. SB SoundBlaster driver compatibility mode. VDS Enables Virtual DMA Services (default). /VERBOSE Display a detailed output when emm386 is loaded. X=hhhh:hhhh Set a memory range for memory mapped devices. E.g. X=D000-D800 X=hhhh:hhhh can be needed e.g. for some network. X=TEST Test ROM locations for UMB exclusion. /? Shows the help.

Comments:

EMM386 requires a 80386+ CPU. HIMEM should be loaded before. Load EMM386 as DEVICE=EMM386.EXE in CONFIG.SYS (although it is an ".exe"-file! EMM386 has to be loaded in CONFIG.SYS / FDCONFIG.SYS.

Examples:

IN CONFIG.SYS / FDCONFIG.SYS: device=c:\fdos\bin\himem.exe device=c:\fdos\bin\emm386.exe

See also:

config.sys devload fdconfig.sys (fdxms) (fdxms286) (himem) himemx jemm386 jemmex xmgr ------------------------------------------------------------------------------ Copyright (C) 2003-2004 Robert Platt, updated 2011 by W. Spiegl. This file is derived from the FreeDOS Spec Command HOWTO. See the file H2Cpying for copying conditions.