The GameBoy has physical memory space from $0000 to $FFFF:
| Memory Read | Address Space | Memory Write |
| Interrupt Enable Register | FFFF | Interrupt Enable Register |
| High RAM | FFFE | High RAM |
| FF80 | ||
| I/O Registers | FF7F | I/O Registers |
| FF00 | ||
| . | FEFF | . |
| FEA0 | ||
| Object Attribute Memory | FE9F | Object Attribute Memory |
| FE00 | ||
| . | FDFF | . |
| E000 | ||
| Low RAM | DFFF | Low RAM |
| C000 | ||
| Cart RAM (Optional) | BFFF | Cart RAM (Optional) |
| A000 | ||
| Video RAM | 9FFF | Video RAM |
| 8000 | ||
| ROM Bank 1-XXX | 7FFF | RAM/ROM Select (MBC1 Only) |
| 6000 | ||
| 5FFF | RAM Bank Select | |
| 4000 | ||
| ROM Bank 0 | 3FFF | ROM Bank Select MS Byte (MBC5 Only) |
| 3000 | ||
| 2FFF | ROM Bank Select LS Byte | |
| 2000 | ||
| 1FFF | RAM Bank Enable | |
| 0000 |
Here is the layout of the Video RAM:
| Memory Read/Write | Address Space |
| Tile Map 2 | 9FFF |
| 9C00 | |
| Tile Map 1 | 9BFF |
| 9800 | |
| Tiles $00-$7F (FF40:Bit4=0) | 97FF |
| 9000 | |
| Tiles $80-$FF | 8FFF |
| 8800 | |
| Tiles $00-$7F (FF40:Bit4=1) | 87FF |
| 8000 |
The lower part of ROM bank 0 Read is setup like the following:
| Memory Read | Address Space |
| Cart Header Info Area | 014F |
| 0100 | |
| Hi-to-Lo Interrupt Vector | 0060 |
| Serial Transfer Complete Interrupt Vector | 0058 |
| Timer Overflow Interrupt Vector | 0050 |
| LCDC Interrupt Vector | 0048 |
| Vertical Blank Interrupt Vector | 0040 |
| Restart Vector $38 | 0038 |
| Restart Vector $30 | 0030 |
| Restart Vector $28 | 0028 |
| Restart Vector $20 | 0020 |
| Restart Vector $18 | 0018 |
| Restart Vector $10 | 0010 |
| Restart Vector $08 | 0008 |
| Restart Vector $00 | 0000 |
| Memory Read | Address Space | Format | |
| Checksum L | 014F | ||
| Checksum H | 014E | ||
| Complement Check | 014D | ||
| Mask ROM Version | 014C | ||
| Old Maker Code | 014B | $33 | |
| Destination Code | 014A | 0 = Jap, 1 = non-Jap | |
| Cart RAM Size | 0149 | ||
| ROM Size | 0148 | ||
| Cartridge Type | 0147 | ||
| Game Unit Code | 0146 | $03=SGB Features | |
| Maker Code L (ascii hex) | 0145 | ||
| Maker Code H (ascii hex) | 0144 | ||
| Color Compatibility | 0143 | $80=GBC Support | |
| Game Title (uppercase ascii) | 0142 | ||
| 0134 | |||
| Nintendo Graphic | 0133 | ||
| 0104 | |||
| JP $XXXX | 0103 | ||
| 0101 | |||
| NOP ($00) | 0100 |
| 00 | None | |
| 01 | 2K Bytes | 1 Bank |
| 02 | 8K Bytes | 1 Bank |
| 03 | 32K Bytes | 4 Banks |
| 05 | 128K Bytes | 16 Banks |
| Bits | Bytes | |
| 00 | 256K | 32K |
| 01 | 512K | 64K |
| 02 | 1M | 128K |
| 03 | 2M | 256K |
| 04 | 4M | 512K |
| 05 | 8M | 1M |
| 06 | 16M | 2M |
| 52 | 9M | 1.1M |
| 53 | 10M | 1.2M |
| 54 | 12M | 1.5M |
| 00 | ROM Only |
| 01 | ROM+MBC1 |
| 02 | ROM+MBC1+RAM |
| 03 | ROM+MBC1+RAM+Batt |
| 05 | ROM+MBC |
| 06 | ROM+MBC2+Batt |
| 08 | ROM+RAM |
| 09 | ROM+RAM+Batt |
| 0B | ROM+MMM01 |
| 0C | ROM+MMM01+RAM |
| 0D | ROM+MMM01+RAM+Batt |
| 0F | ROM+MBC3+Timer+Batt |
| 10 | ROM+MBC3+Timer+RAM+Batt |
| 11 | ROM+MBC3 |
| 12 | ROM+MBC3+RAM |
| 13 | ROM+MBC3+RAM+Batt |
| 19 | ROM+MBC5 |
| 1A | ROM+MBC5+RAM |
| 1B | ROM+MBC5+RAM+Batt |
| 1C | ROM+MBC5+Rumble |
| 1D | ROM+MBC5+Rumble+RAM |
| 1E | ROM+MBC5+Rumble+RAM+Batt |
| 1F | Pocket Camera |
| FD | Bandai TAMA5 |
| FE | Hudson HuC-3 |
| FF | Hudson HuC-1 |