Created by: Microsoft/IBM
First released: 1981
Historical significance: For the release of its famous Personal Computer (model 5150) in 1981, IBM licensed Microsoft BASIC and tailored it for its new PC. Initially, this resulted in 3 different versions of BASIC: IBM Cassette BASIC, for models without disk drives which used cassettes to store and retrieve programs and data, IBM Disk BASIC, which used floppy disks for storage and IBM Advanced BASIC (AKA BASICA), which required Cassette BASIC in ROM to run. In 1984, IBM also released IBM PCjr Cartridge BASIC, a ROM cartridge version of BASIC that was used by the IBM PCjr.