The table below highlights the main areas that can be accessed in Sega Saturn games.
| Start | End | Name | Description |
|---|---|---|---|
| 0x00 | 0x000FFFFF | Boot ROM | Repets every 512 kb |
| 0x00100000 | 0x0017FFFF | SMPC registers | |
| 0x00180000 | 0x001FFFFF | Backup RAM | |
| 0x00200000 | 0x002FFFFF | Work RAM Low | |
| 0x00300000 | 0x003FFFFF | Random data | Random on every read (mostly 0x00) |
| 0x00400000 | 0x007FFFFF | Zero | Always returns 0x0000 |
| 0x00800000 | 0x00FFFFFF | Unknown | Always returns 0x00000001000200030004000500060007 |
| 0x01000000 | 0x017FFFFF | Master Init (MINIT) | Data written goes to Master SH-2 Free Running Timer. Section is Write Only. |
| 0x01800000 | 0x01FFFFFF | Slave Init (SINIT) | Data written goes to Slave SH-2 Free Running Timer. Section is Write Only. |
| 0x02000000 | 0x03FFFFFF | CS0 | Cartridge 0 |
| 0x04000000 | 0x04FFFFFF | CS1 | Cartridge 1 |
| 0x05000000 | 0x057FFFFF | Dummy | |
| 0x05800000 | 0x058FFFFF | CD-ROM registers (CS2) | Repeats every 64 Bytes |
| 0x05900000 | 0x059FFFFF | Unknown | It will lockup the saturn when read |
| 0x05A00000 | 0x05AFFFFF | 68000 Audio Work RAM | Stores audio data that will be played |
| 0x05B00000 | 0x05BFFFFF | SCSP registers | |
| 0x05C00000 | 0x05C7FFFF | VDP1 VRAM | Video RAM for the 3D VDP1 |
| 0x05C80000 | 0x05CFFFFF | VDP1 Framebuffer | Current Image Buffer for the VDP1 to render to |
| 0x05D00000 | 0x05D7FFFF | VDP1 Registers | VDP1 variables that change the functionality of how the VDP1 operates |
| 0x05D80000 | 0x05DFFFFF | Lockup when read | |
| 0x05E00000 | 0x05EFFFFF | VDP2 VRAM | Video Display Processor 2 (Background) Video RAM - Repeats every 512 kb |
| 0x05F00000 | 0x05F7FFFF | VDP2 CRAM | VDP2 Color RAM - Basically the background Palette - Repeats every 4kb |
| 0x05F80000 | 0x05FBFFFF | VDP2 registers | VDP2 variables that change the functionality of how the VDP2 operates - Repeats every 512 bytes |
| 0x05FC0000 | 0x05FDFFFF | Unknown | Always returns 0x000E0000 |
| 0x05FE0000 | 0x05FEFFFF | SCU registers | Repeats every 256 bytes |
| 0x05FF0000 | 0x05FFFFFF | Unknown registers | Repeats every 256 bytes |
| 0x06000000 | 0x07FFFFFF | Work RAM High |
