@echo off
mode co80
cls
SET THIS_VARIABLE_I1=EXACTLY012345678901234567890123456789
SET THIS_VARIABLE_IS=EXACTLY012345678901234567890123456789
IF NOT '%THIS_VARIABLE_IS%'=='EXACTLY012345678901234567890123456789' GOTO ERROR
goto env_ok
:ERROR
echo This computer does not have sufficient DOS environment space free for
echo the Modeling the Dream CD menu system to operate. Please allocate
echo at least 512 bytes of environment space. The easiest way to do this
echo is by adding the following line to your CONFIG.SYS file and then
echo rebooting.
echo:
echo    SHELL = C:\COMMAND.COM /E:512 /p
echo:
echo If this line does not exist in your CONFIG.SYS file, then add it. If you
echo already have 512 bytes or more of environment space, try increasing the 
echo number after E: by 64. You must save CONFIG.SYS and reboot your computer 
echo for the changes to take effect.
SET THIS_VARIABLE_I1=
set THIS_VARIABLE_IS=
goto end
:env_ok
SET THIS_VARIABLE_I1=
set THIS_VARIABLE_IS=