| $FF00 | P1/JOYP | Joypad | Mixed | All |
| $FF01 | SB | Serial transfer data | R/W | All |
| $FF02 | SC | Serial transfer control | R/W | Mixed |
| $FF04 | DIV | Divider register | R/W | All |
| $FF05 | TIMA | Timer counter | R/W | All |
| $FF06 | TMA | Timer modulo | R/W | All |
| $FF07 | TAC | Timer control | R/W | All |
| $FF0F | IF | Interrupt flag | R/W | All |
| $FF10 | NR10 | Sound channel 1 sweep | R/W | All |
| $FF11 | NR11 | Sound channel 1 length timer & duty cycle | Mixed | All |
| $FF12 | NR12 | Sound channel 1 volume & envelope | R/W | All |
| $FF13 | NR13 | Sound channel 1 period low | W | All |
| $FF14 | NR14 | Sound channel 1 period high & control | Mixed | All |
| $FF16 | NR21 | Sound channel 2 length timer & duty cycle | Mixed | All |
| $FF17 | NR22 | Sound channel 2 volume & envelope | R/W | All |
| $FF18 | NR23 | Sound channel 2 period low | W | All |
| $FF19 | NR24 | Sound channel 2 period high & control | Mixed | All |
| $FF1A | NR30 | Sound channel 3 DAC enable | R/W | All |
| $FF1B | NR31 | Sound channel 3 length timer | W | All |
| $FF1C | NR32 | Sound channel 3 output level | R/W | All |
| $FF1D | NR33 | Sound channel 3 period low | W | All |
| $FF1E | NR34 | Sound channel 3 period high & control | Mixed | All |
| $FF20 | NR41 | Sound channel 4 length timer | W | All |
| $FF21 | NR42 | Sound channel 4 volume & envelope | R/W | All |
| $FF22 | NR43 | Sound channel 4 frequency & randomness | R/W | All |
| $FF23 | NR44 | Sound channel 4 control | Mixed | All |
| $FF24 | NR50 | Master volume & VIN panning | R/W | All |
| $FF25 | NR51 | Sound panning | R/W | All |
| $FF26 | NR52 | Sound on/off | Mixed | All |
| $FF30-FF3F | Wave RAM | Storage for one of the sound channels’ waveform | R/W | All |
| $FF40 | LCDC | LCD control | R/W | All |
| $FF41 | STAT | LCD status | Mixed | All |
| $FF42 | SCY | Viewport Y position | R/W | All |
| $FF43 | SCX | Viewport X position | R/W | All |
| $FF44 | LY | LCD Y coordinate | R | All |
| $FF45 | LYC | LY compare | R/W | All |
| $FF46 | DMA | OAM DMA source address & start | R/W | All |
| $FF47 | BGP | BG palette data | R/W | DMG |
| $FF48 | OBP0 | OBJ palette 0 data | R/W | DMG |
| $FF49 | OBP1 | OBJ palette 1 data | R/W | DMG |
| $FF4A | WY | Window Y position | R/W | All |
| $FF4B | WX | Window X position plus 7 | R/W | All |
| $FF4D | KEY1 | Prepare speed switch | Mixed | CGB |
| $FF4F | VBK | VRAM bank | R/W | CGB |
| $FF51 | HDMA1 | VRAM DMA source high | W | CGB |
| $FF52 | HDMA2 | VRAM DMA source low | W | CGB |
| $FF53 | HDMA3 | VRAM DMA destination high | W | CGB |
| $FF54 | HDMA4 | VRAM DMA destination low | W | CGB |
| $FF55 | HDMA5 | VRAM DMA length/mode/start | R/W | CGB |
| $FF56 | RP | Infrared communications port | Mixed | CGB |
| $FF68 | BCPS/BGPI | Background color palette specification / Background palette index | R/W | CGB |
| $FF69 | BCPD/BGPD | Background color palette data / Background palette data | R/W | CGB |
| $FF6A | OCPS/OBPI | OBJ color palette specification / OBJ palette index | R/W | CGB |
| $FF6B | OCPD/OBPD | OBJ color palette data / OBJ palette data | R/W | CGB |
| $FF6C | OPRI | Object priority mode | R/W | CGB |
| $FF70 | SVBK | WRAM bank | R/W | CGB |
| $FF76 | PCM12 | Audio digital outputs 1 & 2 | R | CGB |
| $FF77 | PCM34 | Audio digital outputs 3 & 4 | R | CGB |
| $FFFF | IE | Interrupt enable | R/W | All |