When you boot an Apple II with the BASICS diskette or the DOS 3.3 System Master Diskette, Integer BASIC and the Programmer's Aid #1 are loaded into the Language Card. The code between Integer BASIC and the Programmer's Aid #1 ($D800 - $DFFF) is loaded with a completely useless part of Applesoft.
This applies to the Apple II and Apple II+.
Article Change History:
12 Feb 1997 - Reviewed for technical accuracy, revised formatting.