DOS ain't dead

save & restore environment (Developers)

posted by bencollver , 28.02.2026, 15:20

> > I ran into a situation in SvarDOS where the EDR-DOS command interpreter
> [...]
>
> Is it really the EDR command.com or SvarCOM, the default SvarDOS command
> interpreter?

It was really EDR command.com, and here's how i reproduced it:

Downloaded and extracted the TCC sources:

    C:\>curl -O gopher://tilde.pink/9/~bencollver/files/dos386/devel/tcc/src.zip
   
    C:\>unzip src.zip

Verify shell

    C:\>ver
   
    Enhanced DR-DOS based on Caldera OpenDOS 7.01
    Copyright (c) 1976, 1997 Caldera, Inc. All rights reserved.
    Patches to original OpenDOS source code Copyright (c) 2002-2011 Udo Kuhnt
   
    C:\>command.com /? | find "DOS"
    Enhanced DR-DOS based on Caldera OpenDOS 7.01
    Patches to original OpenDOS source code Copyright (c) 2002-2011 Udo Kuhnt
   
    C:\>find "SHELL=" config.sys
    ---------------- CONFIG.SYS
    SHELL=C:\COMMAND.COM C:\ /E:2048 /P

Configure Watcom build environment

    C:\>cd watcom
   
    C:\WATCOM>owsetenv
    Open Watcom Build Environment
   
    C:\WATCOM>cd ..

Configure HX

    C:\>set DPMILDR=136
   
    C:\>set HDPMI=32
   
    C:\>path %PATH%;C:\HX\BIN
   
    C:\>hxldr32
    HXLdr32 V1.13 Installed. Win32 console apps may possibly run now in DOS

Edit TCC win32\mkall.bat
Change one line.
OLD: set CALL=\command.com /c
NEW: set CALL=call

    C:\>cd src\win32
   
    C:\SRC\WIN32>oed mkall.bat
    1921
    /set CALL=\\command.com/s/.*/set CALL=call/p
    set CALL=call
    w
    1910
    q

Compile TCC
Takes a while for the script to complete or fail.

    C:\SRC\WIN32>mkall.bat

Verify duplicate variables in environment

    C:\SRC\WIN32>set | find "D="
    CD=C:\SRC\WIN32
    D=-dTCC_TARGET_PE -dTCC_TARGET_I386
    D=-DTCC_TARGET_PE -DTCC_TARGET_I386
    D=-DTCC_TARGET_PE -DTCC_TARGET_I386

    C:\>

Complete thread:

• save & restore environment - bencollver, 28.02.2026, 00:52 (Developers)
  • save & restore environment - Rugxulo, 28.02.2026, 03:18
    • save & restore environment - bencollver, 28.02.2026, 04:26
      • save & restore environment - Rugxulo, 01.03.2026, 00:24
  • save & restore environment - boeckmann, 28.02.2026, 10:23
    • save & restore environment - bencollver, 28.02.2026, 15:20
      • save & restore environment - boeckmann, 28.02.2026, 19:26
        • save & restore environment - bencollver, 01.03.2026, 15:12
        • save & restore environment - bencollver, 08.03.2026, 00:45
          • save & restore environment - jadoxa, 08.03.2026, 01:39
            • save & restore environment - bencollver, 08.03.2026, 02:05
              • save & restore environment - boeckmann, 08.03.2026, 22:23
                • save & restore environment - boeckmann, 09.03.2026, 17:15
                  • save & restore environment - bencollver, 09.03.2026, 20:09