From memory the emulator has more memory protection measures in place such as writing 0xEFEF to freed memory (yes?).
The emulator does have better memory protection in place, but it's not from writing any special values to freed blocks. Rather, it checks all memory accesses in the dynamic heap against its knowledge of which blocks are free, which are allocated but unlocked, and which are allocated and locked and can be safely accessed.
-- Keith Rollin -- Palm OS Emulator engineer
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