AGIAGI (Adventure Game Interpreter) was the development tool used by Sierra Online to create their early adventure games.
AGI was originally developed by IBM and donated to Sierra to showcase the technology of their PCjr computer.
The first game to use the AGI engine was King's Quest I, released in 1984. Other titles which used it include King's Quest II and III, Police Quest, Leisure Suit Larry, Space Quest I and II and The Black Cauldron. There were also a few games made with AGI that were not adventure games.
When it was first used, in the mid-1980s, AGI was very innovative and made impressive use of the technology available at the time. Later versions were adapted to use 16 color EGA graphics and the Adlib soundcard.
By the end of the 80s, however, AGI's 160×200 resolution began to look outdated and it couldn't keep up with newer developments such as mice, which were used extensively by the SCUMM engine of competitor Lucasfilm Games. In 1990, Sierra abandoned AGI and started using the SCI (Sierra Creative Interpreter) engine for their adventure games.
Sarien (Sierra AGI resource interpreter engine) is a portable, open-source re-implementation of Sierra's AGI.
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