Nintendo 64 Controller Pak: Purpose, Capacity, and Usage Guide

The Controller Pak (NUS-004) is a removable memory card that plugs into the expansion slot on the bottom of the N64 controller. It stores save data for games that don't have internal battery-backed SRAM/EEPROM on the cartridge.

What It Stores

• Game progress (levels, items, stats)
• Custom settings (controls, difficulty)
• Ghost data (Mario Kart 64, F-Zero X)
• Created content (tracks, teams, rosters)

Technical Specs

• Capacity: 256 Kibibits (32 KiB) — organized as 123 "pages" (1 page = 256 bytes).
• File System: Nintendo proprietary. Directory + FAT. Max 16 files (notes) per Pak.
• Power: CR2032 coin battery (3V) — retains data ~5–10 years. Replaceable.
• Hot-Swappable: Can insert/remove while console on (game pauses if accessing).

Games Requiring Controller Pak

Notable titles with no cartridge save (require Pak):

• Aerofighters Assault, Armorines, Bass Masters 2000, Command & Conquer, FIFA 99–64, GT64 Championship, Indy Racing 2000, Mission: Impossible, NBA Courtside 2, PGA European Tour, Robotron 64, South Park Rally, Tetrisphere (high scores), Tom Clancy's Rainbow Six, Wipeout 64.

Many others use Pak for extra slots (e.g., Mario Kart 64 ghosts, Perfect Dark MP setups).

Modern Alternatives

• EverDrive 64 / ED64+ / SummerCart64: SD card flashcarts emulate Controller Pak in SDRAM (battery-free, unlimited virtual Paks).
• N64 Digital / UltraHDMI: Some firmwares support virtual Pak on SD.
• 4-in-1 / Rumble Pak + Memory: Third-party combos (often unreliable).

Tip: If buying used, test battery. Corroded contacts = data loss. Clean with IPA + DeoxIT.