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by Anders M Olsson


This is an experimental patch for Sierra's old AGI games, to make them play three voice music and sound effects via a SoundBlaster or AdLib card.

After the patch has been applied, the game will require a music card to run. Speaker support is removed to make room for SoundBlaster support. So don't try to run a patched game on a computer without proper hardware. There is no check that a card is in place. Absent sound hardware may cause the computer to hang, or other strange behavior may occur.



If your game has a supported version interpreter, you can apply the patch by simply running the program AGISB.EXE from your game directory (note that x64 users will need to do this ion DOSBox). By default, the file AGI will be patched, and no backup is made. IT IS YOUR OWN RESPONSIBILITY TO MAKE A BACKUP COPY OF THE FILE AGI BEFORE PROCEEDING! I will not accept any responsibility for any damage caused by using this program, even if it erases your hard disk. (Not very likely, though!)

If you wish to use other file names than the default, give them as arguments on the command line. Like this:

AGISB [infile] [outfile]


Supported Interpreter Versions

You need a Sierra game with an interpreter version 2.911 or above. NOTHING OLDER WILL WORK! To check the version number of your Sierra interpreters, use Jeremy W. Hayes program AGIVER available from

Note: If your game does not qualify as version 2.911 or above, see Unsupported Interpreter Versions


Unsupported Interpreter Versions

You can extract a version 2.9xx interpreter from another game! When you apply the patch, a small fix is also applied to disable the detection of game IDs. So a patched version 2.9xx interpreter should happily play any version 2 game without complaining. But please don't try to use a version 2 interpreter with a version 3 game or vice versa! All version 3 games should probably work directly, without substituting the interpreter.

To move the interpreter from one game to another, copy the files:

  • AGI
  • All files ending with .OVL
  • optionally HGC_FONT
** The loader - SIERRA.COM - is sometimes renamed to reflect the name of the game, for example KQ1.COM.

If you don't own any games at all with the correct interpreter versions, you can download any of the files DEMOPACK1.ZIP, DEMOPACK2.ZIP or DEMOPACK3.ZIP from

and extract the mentioned files from there.




Games that use




See Also