As most old-school gamers know, the company was founded by the power-gaming couple of Ken and Roberta Williams in 1980. Back then it was known On-Line Systems. The games Mystery House and Time Zone were first released under this label.
By 1982, the company changed its name to Sierra On-Line, but used two other labels to sell some of their product line. SierraVenture was created to sell the company’s re-released software that once sold under the On-Line Systems brand, while the company’s action/arcade games were to be produced under the SierraVision label. Both logos were discontinued in 1984, and the company published all their titles under the Sierra On-Line label.
As revenues increased, so did buying opportunities for Sierra, which had become a software juggernaut. The company acquired other software companies, often including both logos on subsequent products. Purchases included…
Read more of Sierra’s history here: Sierra On-Line Games History: What’s In A Name, Anyway?