+--------+------+------------------------------------------------------+
| Offset |サイズ| 内容 |
+--------+------+------------------------------------------------------+
| 0 | 3 | 'NES' |
| 3 | 1 | $1A (Control-Z) |
| 4 | 1 | 16K PRG-ROMバンクの数 |
| 5 | 1 | 8K CHR-RAMバンクの数 |
| 6 | 1 | ROM制御バイト #1 |
| | | %00000000 |
| | | +-++|||+- 0=水平ミラーリング |
| | | | ||| 1=垂直ミラーリング |
| | | | ||+-- 1=WRAM located at $6000-7FFF |
| | | | |+--- 1=512-byte trainer present |
| | | | +---- 1=Four-screen VRAM layout |
| | | | |
| | | +------ iNES Mapper番号 (下位4ビット) |
| 7 | 1 | ROM制御バイト #2 |
| | | %00000000 |
| | | +-++ |
| | | +------ iNES Mapper番号 (上位4ビット) |
| | | |
| 8-15 | 9 | [Reserved for expansion, should be 0] |
| 16-.. | | PRG-ROMバンク (in ascending order). A trainer pre- |
| | | cedes the firstバンク, if a trainer exists. |
| ..-EOF | | CHR-RAMバンク (in ascending order). |
+--------+------+------------------------------------------------------+