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This book is an open work designed for people interested in learning to program for the NES (Nintendo Entertainment System).
| Address Range (Hexadecimal) | Size | Notes (Page size is 256 bytes) | |
|---|---|---|---|
| $0000–$00FF | 256 bytes | Zero Page — Special Zero Page addressing modes give faster memory read/write access | |
| $0100–$01FF | 256 bytes | Stack memory | |
| $0200–$07FF | 1536 bytes | RAM | |
| $0800–$0FFF | 2048 bytes | Mirror of $0000–$07FF | $0800–$08FF Zero Page $0900–$09FF Stack $0A00–$0FFF RAM |
| $1000–$17FF | 2048 bytes | Mirror of $0000–$07FF | $1000–$10FF Zero Page $1100–$11FF Stack $1200–$17FF RAM |
| $1800–$1FFF | 2048 bytes | Mirror of $0000–$07FF | $1800–$18FF Zero Page $1900–$19FF Stack $1A00–$1FFF RAM |
| $2000–$2007 | 8 bytes | Input/Output registers | |
| $2008–$3FFF | 8184 bytes | Mirror of $2000–$2007 (multiple times) | |
| $4000–$401F | 32 bytes | Input/Output registers | |
| $4020–$5FFF | 8160 bytes | Expansion ROM — Used with Nintendo's MMC5 to expand the capabilities of VRAM. | |
| $6000–$7FFF | 8192 bytes | SRAM — Save Ram used to save data between game plays. | |
| $8000–$FFFF | 32768 bytes | PRG-ROM | |
| $FFFA–$FFFB | 2 bytes | Address of Non Maskable Interrupt (NMI) handler routine | |
| $FFFC–$FFFD | 2 bytes | Address of Power on reset handler routine | |
| $FFFE–$FFFF | 2 bytes | Address of Break (BRK instruction) handler routine | |
The NES has I/O ports located at addresses $2000-$2007 (hexadecimal) and $4000-$4017.