Editing Integer BASIC (section)

===SWEET16===
{{Main|SWEET16}}
In addition to Integer BASIC, the Apple ROMs contained a custom [[assembler language]] known as [[SWEET16]]. SWEET16 is based on [[bytecode]]s that run within a simple 16-bit [[virtual machine]]. This model was used so memory could be addressed via indirect 16-bit pointers and 16-bit math functions calculated without the need to translate those to the underlying multi-instruction 8-bit 6502 code. The entire virtual machine was written in only 300 bytes. Code can call SWEET16 by issuing a [[subroutine]] call, and then return to normal 6502 code when the 16-bit operations are complete.{{sfn|Wozniak|1977|p=43}}

SWEET16 was not used by the core BASIC code, but was later used to implement several utilities. Notable among these was the line renumbering routine, which was included in the Programmer's Aid #1 ROM, added to later Apple II models and available for user installation on earlier examples.<ref>{{cite book |title=Apple Programmers Aid |publisher=Apple |date=1978 |url=http://www.classiccmp.org/cini/pdf/Apple/Apple%20Programmers%20Aid%20Book.pdf}}</ref>