@echo off
if %1'==RESTART' goto restart
if not exist 1MSDOS62.EXE goto missing

REM ----- Do expansion of a split archive -----
:multi
md C:\stepup
if not exist c:\stepup\nul goto dir_err

REM Copy this batch file to the hard disk and transfer control to
REM it so user can change floppies.

echo Preparing MS-DOS 6.2 Setup...

REM Retrieve this batch file's name from the command line
REM
if exist %0 goto as_is

copy %0.bat c:\stepup\msstepup.bat
c:\stepup\msstepup.bat RESTART

:as_is
copy %0 c:\stepup\msstepup.bat
c:\stepup\msstepup.bat RESTART

:restart
echo Unpacking MS-DOS 6.2 Step-Up files...
1msdos62.exe -n -o c:\stepup
if errorlevel 1 goto exp_err

:check2
if exist 2MSDOS62.EXE goto onward2
echo.
echo Insert Disk 2 and then press ENTER.
echo.
pause>nul
goto check2

:onward2
echo Continuing... unpacking MS-DOS 6.2 Step-Up files...
2msdos62.exe -n -o c:\stepup
if errorlevel 1 goto exp_err

REM ------ Once the archives are unpacked, run the commands ------

:unpacked
c:
cd \stepup

REM ----- Begin Special Handling ------
REM Check for one of 2 versions of MSDOS.SYS...

if not exist msdos2.sy# goto domksys

REM                  ITN       DUT
csum C:\MSDOS.SYS 62c7 46e7 e4b3 b27f /H
REM               814  935  894  938

REM Unable to check? Try MAKESYS anyway.
if errorlevel 255 goto domksys

REM The common file is ready to go (itn.814 & dut.935)
if errorlevel 1 if not errorlevel 2 goto domksys
if errorlevel 3 if not errorlevel 4 goto domksys

REM This one needs a alternate patch file (itn.935 & dut.938)
if errorlevel 2 if not errorlevel 3 goto chg_ptch
if errorlevel 4 if not errorlevel 5 goto chg_ptch

REM Cannot recognize this file, so try MAKESYS anyway.
goto domksys

:chg_ptch
REM Was there a failure on a previous run? y: ren alternate to final
if not exist msdos.sy# goto ren2

REM Has this been done before?
if exist MSDOS.XX# goto domksys

ren MSDOS.SY# MSDOS.XX#
:ren2
ren MSDOS2.SY# MSDOS.SY#

REM ------ End Special Handling -------

:domksys
echo.
echo.
echo Starting the MAKESYS utility...
makesys
if errorlevel 1 goto mksys_err
echo.
echo.
echo Starting MS-DOS 6.2 Setup...
REM LOCALIZE HERE - MS-DOS Setup Program Filename
setup.exe
REM Setup will reboot, so batch processing at this point indicates a
REM setup failure.
goto setup_err


REM ----- Error messages ------

:missing
echo.
echo Cannot find the first MS-DOS 6.2 Step-Up archive file.
echo.
echo The archive file is named 1MSDOS62.EXE.
echo
echo To work properly, the SETUP.BAT file and the archive files  
echo must be located in the same directory. (Do not place these
echo files in the directory that contains your MS-DOS 6 files.)
echo.
goto exit

:dir_err
echo.
echo Cannot create the temporary MS-DOS 6.2 Step-Up directory (C:\STEPUP).
echo.
echo Make sure that drive C does not already contain a file or directory 
echo named C:\STEPUP. Also, make sure that the root directory of drive C
echo contains fewer than 512 files and that drive C is not write-protected.
echo.
goto exit

REM ---- Extraction errors ----

:exp_err
echo.
echo Could not extract the MS-DOS 6.2 Step-Up files.
echo.
if errorlevel 50 if not errorlevel 51 goto exp_spc
if errorlevel 13 if not errorlevel 14 goto exp_bad
if errorlevel 4 if not errorlevel 9 goto exp_mem

REM other error...
echo Unable to continue.
echo.
goto exit

:exp_spc
echo There is not enough free space on drive C.
echo.
echo To install MS-DOS 6.2, drive C must contain at least 6.5 MB 
echo of free space.
echo.
goto exit

:exp_bad
echo The archive file (1MSDOS62.EXE or 2MSDOS62.EXE) might be corrupted.
echo.
echo To continue, obtain a new copy of the MS-DOS 6.2 archive files.
echo.
goto exit

:exp_mem
echo There is not enough free conventional memory to extract the 
echo MS-DOS 6.2 Step-Up files. 
echo.
echo To continue, edit your CONFIG.SYS or AUTOEXEC.BAT files and use
echo the REM command to temporarily disable any unnecessary device 
echo drivers or memory-resident programs. Then, restart your computer 
echo and run SETUP.BAT again.
echo.
goto exit

REM ---- MAKESYS errors ----

:mksys_err
echo.
echo.
echo The MAKESYS utility could not complete. For more information, 
echo see the MAKESYS section of the README.NOW file.
echo.
echo When you have read the README.NOW file and are ready to try again,
echo change to the C:\STEPUP directory and type MAKESYS. If MAKESYS 
echo completes successfully, then type SETUP at the command prompt.
echo You do not need to run this batch file (SETUP.BAT) again.
echo.
goto exit

REM ---- MS-DOS Setup error ----

:setup_err
echo.
echo MS-DOS 6.2 Setup could not complete. 
echo.
echo Follow the instructions in Setup's error message (if any).
echo When you are ready to try running Setup again, change to the 
echo C:\STEPUP directory and type SETUP at the command prompt. 
echo You do not need to run this batch file (SETUP.BAT) again.
echo.
echo If you quit Setup by pressing F3, you can restart it
echo by changing to the C:\STEPUP directory and typing SETUP.
echo.
goto exit

:exit
