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AGI/Specifications

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Revision as of 00:12, 17 July 2007 by Buddha^ (talk | contribs) (Removed myself from main credits line as just the AGI256 and AGI256-2 hacks' info isn't that much when compared to all the info that's in here already. I'm in the longer credits list still though.)

AGI Specifications v3.2, 17 July 2007

Lance Ewing, Peter Kelly, Claudio Matsuoka, Stu George, David Symonds


This document is a collection of all the information currently known about the structure and operation of the Adventure Game Interpreter, used in 1984--1989 for a variety of adventure games published by Sierra On-Line such as Space Quest I and II, and Leisure Suit Larry in the Land of the Lounge Lizards.


   * 1.1 About
   * 1.2 Audience
   * 1.3 Conventions used in this document
   * 1.4 What's still missing
   * 1.5 Change log
   * 1.6 Credits

General AGI overview

   * 2.1 Versions of the AGI interpreter
   * 2.2 AGI game files
   * 2.3 LOGIC, PICTURE, SOUND, and VIEW data files
   * 2.4 What is Ego?
   * 2.5 AGI commands
   * 2.6 Debug modes
   * 2.7 Priority bands and control lines

AGI internals

   * 3.1 How the interpreter works
   * 3.2 Variable types
   * 3.3 Variables used by the interpreter
   * 3.4 Flags used by the interpreter
   * 3.5 Memory organization
   * 3.6 Game IDs and loaders
   * 3.7 Encrypted AGI data
   * 3.8 Player input parsing
   * 3.9 AGI interpreter versions
   * 3.10 Version differences

The LOGIC language

   * 4.1 LOGIC syntax
   * 4.2 Reference of the LOGIC commands
   * 4.3 Discussion of sample LOGIC code from KQ4 

Formats of the resource files

   * 5.1 Directory files
   * 5.2 Format of Vol files (version 2)
   * 5.3 Format of Vol files (version 3)
   * 5.4 Sample code

LOGIC resources

   * 6.1 Introduction
   * 6.2 Command list and argument types
   * 6.3 LOGIC resource format
   * 6.4 Sample code

PICTURE resources

   * 7.1 Introduction
   * 7.2 PICTURE resource format
   * 7.3 Implementation
   * 7.4 Using higher resolution modes
   * 7.5 Sierra's picture editor
   * 7.6 Sample code

VIEW resources

   * 8.1 Introduction
   * 8.2 VIEW resource format
   * 8.3 VIEW table
   * 8.4 VIEW test commands
   * 8.5 Sample code 

SOUND resources

   * 9.1 Introduction
   * 9.2 Sound in the IBM PCjr
   * 9.3 Sound in the Apple IIgs
   * 9.4 Sound in other platforms
   * 9.5 SOUND resource format (PCjr version)
   * 9.6 SOUND resource format (IIgs version)
   * 9.7 Playing the sounds on a sound card
   * 9.8 Sample code

Savegame files

Other game data

   * 10.1 Format of the object file
   * 10.2 Format of words.tok
   * 10.3 Sample code

Other information

   * 11.1 The AGDS package
   * 11.2 The making of the Thunderstorm educational Program
   * 11.3 Other AGI interpreters
   * 11.4 Fan-Made Extensions to the AGI Engine