reactos/subsystems/mvdm/config/CONFIG.NT

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REM Virtual DOS Machine (VDM) Default Startup File
REM NOTE: NTVDM does not use CONFIG.BAT as the default
REM environment settings file when running a DOS application. To
REM change the default settings for the VDM, change this file
REM instead. However, if a DOS Shortcut (PIF) is used, then
REM the settings found in the PIF file will be used instead.
REM Echo Output Option
REM ==================
REM When starting up a DOS application, by default, no output
REM text is shown to the user as the application starts
REM up. To display information from both CONFIG.NT and
REM AUTOEXEC.NT, use the option, 'echoconfig'.
REM echoconfig
REM Command Prompt Option
REM =====================
REM If the user returns to the Command Prompt either from a TSR,
REM or while running a DOS application, by default, VDM runs
REM COMMAND.COM. To run cmd.exe instead, use the option, 'ntcmdprompt'.
REM However, if COMMAND.COM cannot be found, VDM will use this option
REM regardless if it's disabled or not.
ntcmdprompt
REM DOS-Only Mode
REM =============
REM By default, any DOS application can run another application,
REM regardless if it's DOS-based or not. To prevent DOS applications
REM from running non-DOS applications, and therefore possibly preventing
REM disruption of the TSR, use the option 'dosonly'.
REM dosonly
REM Expanded Memory Manager (EMM)
REM =============================
REM Syntax = EMM [A=AltRegSets] [B=BaseSegment] [RAM]
REM
REM A = Alternative Mapping Register (AltRegSets)
REM * Determines the Alternative Mapping Register Sets supported by the system.
REM The supported values goes from 1 to 255.
REM * The default value is 8.
REM B = Base Segment
REM * The default value is 0x4000.
REM Random Access Memory (RAM)
REM * If used, then only allocate 64kb address space from the Upper Memory
REM Block (UMB) for EMM page frames, while allowing the rest (if any) to be
REM used by NTVDM for loadhigh and devicehigh commands.
REM * By default, all available and possible UMB will be used for page frames.
REM
REM The size of a program's EMM is determined by it's given PIF file. But
REM if no PIF file is provided, the default settings will be used (_default.pif).
REM But if the size of the given PIF file is zero, then the EMM will be disabled
REM and the options below will be ignored.
REM EMM A=8 B=0x4000 64
REM Disable PC Speaker Audio
REM ========================
REM Disables the playback of PC Speaker Audio.
REM disablepcspeaker
REM Misc. Configuration Options
REM ===========================
REM dos=high, umb
REM device=%SystemRoot%\System32\himem.sys
REM files=40