It's difficult to pinpoint a specific date for the invention of BIOS (Basic Input/Output System), as its development was a gradual process with contributions from multiple individuals and companies.

However, a few key moments can be highlighted:

* 1970s: The first commercially available microprocessors, like the Intel 8080 and Zilog Z80, were released, paving the way for personal computers. Early systems used ROM-based bootstrap loaders to initialize hardware and load the operating system.

* 1975: The IBM 5100 portable computer featured a built-in BIOS that managed basic functions, including keyboard input, display output, and storage access.

* 1981: The release of the IBM PC popularized the use of a dedicated BIOS chip with a standardized interface. This allowed different hardware components to interact with the operating system.

Therefore, it's safe to say that BIOS evolved over the 1970s and early 1980s with significant contributions from IBM and other companies involved in the development of early personal computers.