1. Foreword Game BoyTM CPU ManualTable of Contents1. Foreword...........................................42. Hardware specifications............................52.1. Forward:.......................................52.2. Terms..........................................52.3. Game Boy Specs.................................62.4. Processor......................................62.5. Memory Map.....................................82.5.1. General memory map.........................82.5.2. Echo of 8kB Internal RAM...................92.5.3. User I/O...................................92.5.4. Reserved Memory Locations.................102.6. Cartridge Types...............................132.7. Special modi..................................172.7.1. Power Up Sequence.........................172.7.2. Stop Mode.................................192.7.3. Low-Power Mode............................192.8. Video.........................................222.8.1. Tiles.....................................222.8.2. Sprites...................................252.8.3. Sprite RAM Bug............................272.9. Sound.........................................282.10. Timer........................................302.11. Serial I/O...................................312.12. Interrupts...................................322.12.1. Interrupt Procedure......................322.12.2. Interrupt Descriptions...................342.13. Special Registers............................352.13.1. I/O Registers............................35Page 2 V 1.01