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Microsoft BASIC
Microsoft BASIC is the foundation product of the Microsoft company. It first appeared in 1975 as Altair BASIC, which was the first BASIC by Microsoft and the first high level programming language available for the Altair 8800 microcomputer.
==Altair BASIC and early microcomputers==
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 PDP-10 minicomputer.〔Martin S. Fridson, ''How to be a billionaire: proven strategies from the titans of wealth'', John Wiley and Sons, 1999 ISBN 0-471-33202-X pages 116-120 〕 The dialect of BASIC is similar to Digital Equipment Corporation interpreters, especially in string operations, which vary between BASIC implementations. BASIC uses dynamically allocated strings which store their size. Early BASIC only supports single letter- and digit names, but Microsoft BASIC supports long variable names. Only two characters are significant though; the variable names "AD," "ADDRESS1," and "ADDRESS2" all point to the same value. The runtime symbol table uses a linear search so that a program which used many distinct variables would run much slower (in the time of early processors) than a program which used a single array for all its variables.
Altair BASIC was delivered on paper tape and in its original version took 4 KB of memory. The extended 8 KB 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 9 KB, in an era when 8 KB ROM chips were standard), as well as the 16-bit BASIC-86 (8086/88). It was ideal for early ROM-based computers since it does not require an editor (until the latest versions of BASIC, each line requires a number), nor a disk drive to store object code or linked executable. It is less sophisticated than software for industrial desktop computers, which has dedicated keys to load, store, and keys for editing within a line and debugging; but personal computer pricing, in contrast, started at $1,565 rather than about $7,000.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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