Applesoft BASIC

Applesoft BASIC, also known as FP BASIC, is a dialect of based on  with  support that was adapted for backwards compatibility with Integer BASIC.

History
Apple Computer co-founder Steve Wozniak originally developed the Apple BASIC interpreter (also known as Integer BASIC), which was provided on cassette tape for Apple I users. Because the standard configuration of the Apple I only contained 4KB of RAM, Wozniak did not have enough room to implement floating-point instructions, which he said saved a few weeks' worth of development time. Apple BASIC was also included directly in the ROM of the first Apple II computer, released in 1977. Because scientific users requested floating-point support, Wozniak included routines that could be called from the ROMs, but did not have time to integrate them into Apple BASIC.

Applesoft I
Apple Computer then turned to Microsoft to license their, which Bill Gates had based on 's with floating-point support. Randy Wigginton adapted it to work on the Apple II. It was released in 1978 on cassette tape.

Applesoft II
In June 1979, a revised version of Applesoft BASIC was included in the ROMs of the Apple II plus, with support for its high-resolution graphics modes.