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The Altair BASIC Interpreter was developed by Microsoft founders Paul Allen and Bill Gates with help from Monte Davidoff , using a self made Intel 8080 software simulator running on a Minicomputer . It was delivered on Paper Tape and in its original version took 4 KB of memory. The extended 8K version was then generalized into BASIC-80 (8080/85, Z80 ), and ported into BASIC-68 ( 6800 ), BASIC-69 ( 6809 ), and MOS Technology 6502 -BASIC (unfortunately spilling over to 9KB, in an era when 8K ROM chips were standard), as well as the 16-bit BASIC-86 ( 8086/88 ).

After the initial success of Altair BASIC, Microsoft BASIC became the basis for a lucrative software licensing business, being ported to the majority of the numerous Home and Personal Computer s of the 1970s and especially the 1980s, and extended along the way. Contrary to the original Altair BASIC, most home computer BASICs were resident in ROM , and thus were available on the machines at power-on in the form of the characteristic "READY."-prompt. Hence, Microsoft's and other variants of BASIC constituted a significant and visible part of many home computers' rudimentary Operating System s.


VARIANTS AND DERIVATIVES OF MICROSOFT BASIC