Microsoft BASIC

Microsoft BASIC is the first released software product by Microsoft. It had first appeared in 1975, known as Altair BASIC, which was the first BASIC by Microsoft and the first high-level programming language available for the Altair 8800 microcomputer.

No variety of Microsoft BASIC (BASICA, GW-BASIC, QuickBasic, QBasic) is currently distributed with Windows or DOS. However, versions that will still run on modern machines can be downloaded from various websites or can be found on old DOS disks.