NES Gameplay Issues
The GBA screen has a lower vertical and horizontal resolution than the NES's display. PocketNES compensates by either scaling the image down vertically, or by scrolling the image up or down. Such scrolling can either happen automatically, following the position of a sprite or value of a memory address, or manually using the GBA's L and R buttons. Sound is reproduced via the "classic" Game Boy PSG channels, rather than a software emulation of the NES's sound hardware; this is done to reduce CPU usage. As a result, it does not sound exactly like the original NES, although it is a close approximation.
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