File:Altair 8K BASIC cassette tape.jpg

Summary
Cassette tapes of 8K BASIC and a package of other software for the MITS Altair 8800 computer with a RAM configuration of at least 8 kilobytes. The BASIC implementation was developed by Bill Gates and Paul Allen of Micro-Soft in 1975 for Micro Instrumentation and Telemetry Systems (MITS).

Source

 * En 1975 Bill Gates y Paul Allen crearon un Basic para el Altair (Spanish), Entérate24. 2021-01-02.