Learn SNES memory mapping features: HiROM mode for larger ROM bank windows, and battery-backed SRAM for persistent save data.

Examples

Example	Difficulty	Description
hirom_demo	Intermediate	HiROM mode with 64KB banks (vs LoROM's 32KB)
save_game	Intermediate	Battery-backed SRAM for saving and loading game state

Key Concepts

LoROM vs HiROM

Feature	LoROM	HiROM
Bank size	32KB ($8000-$FFFF)	64KB ($0000-$FFFF)
Max ROM	4MB	4MB
Use case	Most games	Large contiguous data access

Enable HiROM: set USE_HIROM=1 in your Makefile.

SRAM (Battery Backup)

Feature	LoROM	HiROM
Address	$70:0000-$7D:FFFF	$30:6000-$3F:7FFF
Common sizes	2KB, 8KB, 32KB	2KB, 8KB, 32KB

Enable SRAM: set USE_SRAM=1 in your Makefile. Write to the SRAM address range to store data; it persists when the console is powered off (battery permitting).

Start with hirom_demo to understand memory mapping, then save_game for persistent storage.

HiROM Demo -- Understanding SNES Memory Mapping Save Game -- SRAM Persistence