Licensed from Microsoft, IBM released four different variations of Microsoft BASIC for their PC and PCjr computers, one of them known as BASICA (Advanced BASIC) that relied on the ROM chip.
The focus then began to shift to developing an operating system known as DOS (Disk Operating System), although an agreement was made with IBM to include BASIC onto ROM chips in their PCs throughout the decade. Microsoft found commercial success with BASIC until 1981 when the IBM PC first became available. By the end of the 1970s, additional releases had been created and distributed by cassette tape for other platforms such as those that used the MOS 6502 microprocessor. The original Altair BASIC was released on a punched tape and an agreement was made with MITS to distribute the interpreter after a successful demonstration.
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