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3. Memory layout

cc65 generated programs with the default setup run with the kernal and basic banked out. This gives a usable memory range of $1000 - $FD00. Having the kernal and basic ROMs banked out means, that no ROM entry points may be called directly from user code.

Special locations:

Text screen

The text screen is located at $C00 (as in the standard setup).

Color RAM

The color RAM is located at $800 (standard location).


The C runtime stack is located at $FCFF and growing downwards.


The C heap is located at the end of the program and grows towards the C runtime stack.

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