The BASIC programming language turns 60

Easy-to-use programming language that drove Apple, IBM, and Commodore PCs debuted in 1964.

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[JimDavis]

"As part of the deal to buy the GE computer, the undergraduates built the operating system in BASIC for General Electric's version of time-sharing." It's hard to imagine writing disk controllers, etc., in BASIC, and I don't think that's actually what was done; the Dartmouth Time Sharing System https://en.wikipedia.org/wiki/Dartmouth_Time_Sharing_System was probably written in assembler, as would have been common in the early 60s.