Can You Add Pages to a Nintendo 64 Controller Pak? (No — Fixed 256 KB)

No. The Nintendo 64 Controller Pak (NUS-004) has fixed 256 KB (2 Mbit) EEPROM — not expandable. “Pages” refer to the 123-page directory structure (16 pages per save file max), but total capacity is hardware-limited.

What You Can Do

• Manage Existing Space: Delete unused saves (Game Pak → Controller Pak in-game menus).
• Use Multiple Paks: Swap paks (each holds 256 KB). Third-party 4-in-1 paks exist but are unreliable.
• Transfer to Game Pak: Some games (e.g., Mario Kart 64 ghosts, Perfect Dark setups) save directly to cartridge battery/FlashRAM.
• Backup to PC: Use N64 USB Adaptoid / Retrode / OpenLara + Controller Pak → PC backup (.mpk/.eep). Restore later.

What Doesn’t Work

• No hardware mod adds memory chips (address bus not exposed).
• No software “formats” more space — EEPROM size is fixed at manufacture.
• GameShark / Action Replay cannot expand save capacity.

Note: Controller Pak saves are distinct from cartridge saves (SRAM/FlashRAM/EEPROM on cart). Most single-player progress goes on cart; Pak used for multiplayer data, ghosts, photos, custom settings.