Figure 67 is a list of vectors that Atari says will remain the same no matter what changes the OS undergoes. If you want to make sure that your program will run on all the different kinds of Ataris, make sure you don't enter the OS through any other locations.

NAME	ADDR	FUNCTION
EDITRV	58368	Vector table for the screen editor.
SCRENV	58384	Vector table for the display handler.
KEYBDV	58400	Vector table for the keyboard handler.
PRINTV	58416	Vector table for the printer handler.
CASETV	58432	Vector table for the cassette handler
DSKINV	58451	Entry point for the resident disk handler.
CIOV	58454	Entry point for CIO
SIOV	58457	Entry point for SIO.
SETVBV	58460	Routine to set the system timers and  VBLANK vectors.
SYSVBV	58463	Entry point for stage one VBLANK.
XITVBV	58466	Exit VBLANK routine.
WARMSV	58484	Entry point for the warmstart routine.
COLDSV	58487	Entry point for the coldstart routine.

            FIGURE 67. Vectors that don't change

You may also use any of the routines in the floating point package.

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