The Data Areas Window

Data Areas are regions of emulator memory that are defined as data rather than code so that they are displayed in the disassembly pane and any output disassembly using either db or dw instructions.

Each data area can be marked as Bytes (displayed using db) or Words (displayed using dw) by selecting the appropriate option in the Type column.
There is also an option to allow assembler symbols to be used to populate matching values when the Label column is ticked.