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Question:

Before USB, what serial connector type was commonly used for communication, keyboards, mouse, or game controllers?

A DB9.
explanation

The serial connector type that was commonly used for communication, keyboards, mouse, or game controllers before USB was PS/2.
PS/2 was developed by IBM in 1987 and was used in most personal computers until the early 2000s. It was a significant improvement over the previous serial connector standard, RS-232, as it was smaller, faster, and more reliable.
PS/2 connectors are typically purple for the keyboard and green for the mouse. They are also gendered, meaning that male and female connectors cannot be mated together.

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