On-Line Systems also used the Sierra On-Line brand before officially changing to the Sierra name in 1982.
The design of this logo may very depending on which game it is.
In 1998, The Mountain circle was dropped and the text changed. The company split into 4 sub brands (and another for one purpose), Those being Sierra Studios, Sierra Attractions, Sierra Home, Sierra Sports and Sierra FX.
Sierra Studios, the main publishing devision for Sierra On-Line.
In 2001, all the sub-brands were formed back into one universal brand (except Sierra Home, which remained separate) under the "Sierra" name. Only a few games used this logo as it was short-lived, such as The Operative: No One Lives Forever - Game of the Year Edition
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