The new ROM firmware allowed Applesoft BASIC to recognize lowercase characters and work better with an 80-column display, and fixed several bugs from the IIe ROM.
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Applesoft BASIC was included in the ROMs of all Apple II models from the Apple II Plus forward, and eventually became the platform for far more programs than Integer BASIC.
SiMPLE is vaguely reminiscent of the AppleSoft BASIC programming language that existed on the old Apple-II computers.