To set the memory capacity of the emulator, do the following:
Open the Preferences window from the main menu by choosing Tools > Preferences.
In the Preferences window, open the General Settings tab.
Change the value in the Memory Capacity field (maximum total
heap size in the initialization file epoc.ini) to emulate
target devices with different memory capacity. The valid range is from 8 to
256 MB. The default is 32 MB.
Click OK.
Close and restart the emulator.
The changed memory capacity value will now be applied in the emulator.