n64_overclock

Switchless Overclocking Mod for N64

Atmel port of Botis4938s N64 Overclocking Mod: Switchless with PIC12F629 (github)

Function

• The µC will initially start with the minimum multiplier (default: 1.5x)
• shortly press the reset Button: reset console
• press and hold reset button: LED switches colors to indicate the modes (depending on your configuration).
  • order is (without 1.0x): 1.5x -> 2.0x (-> 3.0x) -> 1.5x -> and so on...
• in order to save the current mode you need to powercycle the console! A simple reset is not enough casue a mode-change during console operation would lead to crash.

How-To build

• To build the project you need
  • the sources (obviously)
  • a c-compiler for AVR (WinAVR, Atmel-Toolchain, ATmel-Studio or else...)
• Then you'll need to decide which controller you want to use
  • tested controllers: ATtiny13, ATtiny45, ATtiny2313
  • others of this family should also work but are not implemented!
• build syntax:
  • the build command is: make {controller}[{maxMultiplier}]{LedType}
    • example 1: (MCU: ATtiny13, Max. Multiplier: 3.0x, Led-Type: Common Anode)
      • make tiny13_3_0_CA
    • example 2: (MCU: ATtiny45, Max. Multiplier: 2.0x, Led-Type: Common Cathode)
      • make tiny45_CC

How-To flash

• To flash this project you need
  • a µController (obviously)
  • a ISP-Flasher (USBTinyISP, STK500, etc...)
  • a Flasher-Tool (Atmel-Studio, avrdude, etc...)
• After building the project you will have a .hex file named like "n64_overclock_t13_3_0x_CA"
• flash the hex file with your Flasher-Tool
• after that we have to set the fusebits:
  • cause of lack of pins on the 8-Legged devices, we need to disable the reset button.
  • warining: when you disabled the reset button, the only possible way of flashing/erasing the µController is via HVPP/HVSP (High Voltage Programming)
  • Fuses for:
    • ATtiny13: low:0x7B high:0xFE
    • ATtiny45: low:0xE4 high:0x5F
    • ATtiny2313: low:0xE6 high:0xDF

How-To connect

• To connect this Mod you need:
  • a N64 (obviously)
  • a flashed µController
  • a 100nF ceramic capacitor
  • a Multicolor LED (according to your flashed Firmware)
  • two 100 Ohm resistors (connected to the appropriate pin)
  • a Gambit Screwdriver
• Pinout:

µController-Pin	Description	Target
Pin 1	Reset In	PIF-NUS Pad 27 / Reset Switch Pad
Pin 2	LED-color 0	Led 0 / LED-Leg 1
Pin 3	Led-color 1	Led 1 / LED-Leg 2
Pin 4	Vss/GND	PIF-NUS Pin 14
Pin 5	Reset Out	PIF-NUS Pin 27
Pin 6	multiplier 0	CPU Pin 112
Pin 7	multiplier 1	CPU Pin 116
Pin 8	Vcc/+3V3	PIF-NUS Pin 28

• For further instructions go (here) or (here) (german links)