參考資訊：
https://wiki.neogeodev.org/index.php?title=Main_Page
| Address | Mask | Read | Write |
|---|---|---|---|
| 0x00 | 0x0c | 1. Read sound code from 68k 2. Acknowledge NMI |
Clear sound code from 68k to 0x00 |
| 0x07~0x04 | 0x0c | YM2610 I/O | YM2610 I/O |
| 0x08 | 0x1c | Set 0xf000~0xf7ff bank | Enable NMIs |
| 0x09 | 0x1c | Set 0xe000~0xefff bank | Enable NMIs |
| 0x0a | 0x1c | Set 0xc000~0xdfff bank | Enable NMIs |
| 0x0b | 0x1c | Set 0x8000~0xbfff bank | Enable NMIs |
| 0x0c | 0x0c | See SDRD1 | Reply to 68k |
| 0x18 | 0x1c | See address 0x08 | Disable NMIs |