DOS 3.3: INTBASIC and FPBASIC on the master diskette

The INTBASIC and FPBASIC files on the master diskette load automatically into your Language Card if you have one. Since these files are written to operate specifically in the memory space of the Language Card, they don't work anywhere else.
To use Applesoft with your Apple II (which has Integer BASIC built in), you need either the Applesoft Firmware Card or the Language Card installed into your system.

Apple II+s have Applesoft built in; therefore, your system needs the Integer BASIC firmware card or a language card to use Integer BASIC.
Published Date: Feb 18, 2012