dos-virus

Retro programming in Borland Turbo Assembler

Prerequisites

To build and run the Borland Turbo Assembler virus programs, you must first install the following tools:

• DOSBox
• Borland Turbo Assembler
• ASM Edit

Install DOSBox

openSUSE

$ sudo zypper install dosbox mtools p7zip-full

Ubuntu

$ sudo apt install dosbox mtools p7zip-full

Configuration

When starting dosbox the first time, the configuration file ~/.dosbox/dosbox-0.74-2.conf will be generated

Install Borland Turbo Assembler

1. Download Borland Turbo Assembler 4.0 (3.5-1.44mb).7z

2. Create a directory which will contain the DOS C: drive

   $ mkdir ~/DOSBox
   

3. Extract the downloaded Borland Turbo Assembler archive

   $ 7z x "Borland Turbo Assembler 4.0 (3.5-1.44mb).7z"
   

4. Extract the Borland Turbo Assembler disk images

   $ cd "Borland Turbo Assembler 4.0 (3.5-1.44mb).7z"/
   $ mkdir tasminst
   $ for i in disk01.img disk02.img disk03.img; do echo $i; mcopy -m -i $i :: tasminst; done
   

5. Move the extracted files to the DOS C: drive

   $ mv tasminst ~/DOSBox/
   

6. Configure DOSBox

   Edit ~/.dosbox/dosbox-0.74-2.conf and add the following autoexec options

   [autoexec]
   mount c ~/DOSBox
   path %PATH%;C:\TASM\BIN
   c:
   

7. Start dosbox and execute the Borland Turbo Assembler installation program

   $ dosbox
   C:\> cd tasminst
   C:\TASMINST> install.exe
   

   In the installation program, select the following options

   Enter the SOURCE drive to use: C
   Enter the SOURCE Path: \TASMINST
   TASM Directory             [ C:\TASM ]
   Windows Directory          [ C:\WINDOWS ]
   16-bit command line tools  [ Yes ]
   32-bit command line tools  [ No  ]
   Turbo Debugger for Windows [ No  ]
   Turbo Debugger for DOS     [ Yes ]
   Turbo Debugger for Win32   [ No  ]
   Examples                   [ No  ]
   Documentation Files        [ No  ]
   
   Start Installation
   

Install ASM Edit

1. Download ASM Edit

   $ curl -O http://www.o-love.net/asmedit/aedt182b.zip
   

2. Extract the downloaded ASM Edit archive

   $ unzip aedt182b.zip -d aedtinst/
   

3. Move the extracted files to the DOS C: drive

   $ mv aedtinst ~/DOSBox/
   

4. Configure DOSBox

   Edit ~/.dosbox/dosbox-0.74-2.conf and add the following autoexec options

   [autoexec]
   path %PATH%;C:\ASMEDIT
   

5. Start dosbox and execute the ASM Edit installation program

   $ dosbox
   C:\> cd aedtinst
   C:\AEDTINST> install.exe
   

   In the installation program, select the following options

   Press Alt+I to Begin install
   Target path: C:\ASMEDIT
   Press Alt+X to Exit
   

Build virus programs

Link the dos-virus git repository to the DOS C: drive

$ ln -s ~/git/github/dos-virus ~/DOSBox/virus

Build from DOS terminal

1. Execute build script

   C:\VIRUS> buildall.bat
   

   The virus programs will be located in the C:\VIRUS\BUILD directory

Build from ASM Edit

1. Start ASM Edit

   C:\VIRUS> asmshell
   

2. Configure ASM Edit

   Press ALT+O for options

   Select External programs, Assembler, user defined, Edit and type in the following options

   Program title: TASM
   Program path: C:\TASM\BIN\TASM.EXE
   Command line: /w1/m/t !ACMPL,!ANAME,!ANAME
   

   Select External programs, Linker, user defined, Edit and type in the following options

   Program title: TLINK
   Program path: C:\TASM\BIN\TLINK.EXE
   Command line: !ANAME!OBJFL,!ANAME!TARGT,!ANAME.MAP,!LIBFL,!MKCOM
   

   Select Directories and type in the following directories

   ASM files search path: C:\VIRUS\SRC
   COM, EXE, LIB and OBJ: C:\VIRUS\BUILD
   Includes and Macros: C:\VIRUS\SRC
   

   Select Environment, Preferences and the following options

   Auto save: [ ] Desktop
   

   Select Environment, Editor and the following options

   [ ] Create backup files
   

   Select Save

3. Open virus source file

   Press F3 to open file

4. Build virus program

   Press Alt-A and then press Assemble to assemble the file

   Press Alt-A and then press Link to link the file

   The virus programs will be located in the C:\VIRUS\BUILD directory

License

Licensed under MIT license. See LICENSE for more information.

Authors

• Johan Gardhage