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The most frequently cited flaw of Integer BASIC was, as one might expect from the name, that its variables were all 16-bit integers and it was very difficult to write a program that could do calculations using floating point numbers. It was therefore very difficult to write financial or math programs. Apple Computer licensed a more full-featured (but also much slower) version of BASIC from Microsoft, introduced some tweaks, named it Applesoft BASIC, and included it in the ROMs of the Apple II Plus, which was released in 1979. Integer BASIC was relegated to a file on a floppy disk that Apple II Plus users could load into a RAM card for backward compatibility, if needed. Applesoft BASIC was included in the ROMs of all subsequent Apple II models, and became the foundation of probably hundreds of thousands of programs.

The Integer BASIC ROMs also included a "mini-assembler" that let programmers type assembly languageAssembly language or simply assembly is a human-readable notation for the machine language that a specific computer architecture uses. Machine language, a pattern of bits encoding machine operations, is made readable by replacing the raw values with symbo programs, line by line, which were entered into memory. This was of course far easier than looking up the corresponding opcodeA computer can perform operations, each of which is assigned a numeric code called an opcode . To assist in the use of these numeric codes, mnemonics are used as textual abbreviations. It's much easier to remember ADD than 05, for example. Opcodes operates in machine languageA system of codes directly understandable by a computer's CPU is termed this CPU's native or machine language . Although machine code may seem similar to assembly language they are in fact two different types of languages. Assembly code consists of both b and typing those in. These ROMs also included an interpreter for a simple 16-bit assembly language, called Sweet16, which was very simple, compact and worthy of study. These two features, some cassetteFor the meaning of cassette in genetics, see cassette (genetics). The compact audio cassette audio storage medium was introduced by Philips in 1963. It consists of a length of magnetic tape from BASF inside a protective plastic shell. Four tracks are avai tape I/O routines, and a few seldom-used floating point math routines were removed in the transition from the Integer BASIC ROMs to the Apple II Plus ROMs, in order to accommodate the larger size of the Applesoft BASIC interpreter.