How Does the Wii Work? Hardware, Wii Remote Tech & Software Architecture

Core Hardware

• CPU: IBM "Broadway" PowerPC @ 729 MHz
• GPU: ATI "Hollywood" @ 243 MHz (fixed-function, TEV pipeline)
• RAM: 88 MB (24 MB 1T-SRAM + 64 MB GDDR3)
• Storage: 512 MB NAND (system, saves, channels)
• Wireless: Bluetooth 2.0 (Wiimotes), Wi-Fi 802.11b/g

Wii Remote (Wiimote) Tech

• 3-axis accelerometer (ADXL330): Linear acceleration, tilt vs. gravity
• IR camera (PixArt): Tracks two IR LEDs on Sensor Bar → 2D pointing + depth estimation
• Bluetooth HID: Pairs with console; reports buttons, accel, IR dots, extension data
• Expansion port: Nunchuk (accel + stick), Classic Controller, MotionPlus (gyro), Vitality Sensor

Sensor Bar

Two IR LED clusters (5 LEDs each) powered by Wii (12 V) or batteries. Provides fixed reference for IR camera—not a sensor itself.

Software Architecture

• IOS (Input/Output System): Separate ARM9 kernel on Starlet co-processor handles USB, Wi-Fi, Bluetooth, NAND, security (signing). Each title loads a specific IOS version.
• Broadway runs game code (PowerPC), calls IOS via IPC for hardware access.

Key Innovations

• Motion-first design → expanded audience (Wii Sports, Fit)
• WiiConnect24: Standby mode with network (weather, news, messages)
• Virtual Console: Official emulation of NES, SNES, N64, Genesis, TurboGrafx, Neo Geo, Arcade

Legacy: Motion controls → Wii U GamePad → Switch Joy-Con. IR pointing → gyro aiming.