Table of Contents
Setup the Cart Readers configuration switches like so:
For the repro to be flashable with the OSCR it needs to have a PCB with an Altera Max II CPLD and Spansion S29GL256N or MX29LV640 flashroms.
The repro cart needs to have the same CIC and save type as the ROM you want to flash and the ROM needs to be in Z64 file format. Here is a list of all the games and their save and cic type.
Changing the repro to PAL:
The repro needs to be the same region as your console or else it won't boot.
On the PCB there is a solder jumper marked with J1. If you bridge the middle(PIN3) and the lower(GND) pad together then the ultraCIC will be switched to PAL. But make absolutely sure that PIN3 is not connected to VCC(red in the picture) by default, if that's the case you need to cut its connection to VCC before you connect it to GND. Check with a multimeter after everything is done and make sure that VCC and GND are not shorted.
Reflashing the ultraCIC:
You can also re-flash the Attiny25 to a different CIC type using an Arduino Uno running this sketch by Adafruit.
Don't forget to connect Pin 9 of the Arduino Uno to Pin 2 of the ultraCIC to provide a clock signal.
Furthermore, many Arduino boards (e.g., UNO, Mega) require a 10µF electrolytic capacitor between RESET and GND, with the positive (long leg) connected to RESET. The capacitor prevents the "master" Arduino from resetting when the serial port is opened. If the board resets, programming will fail.
First read out the Attiny25's current code in binary form. Since you most likely already have the Arduino IDE installed we will use the included avrdude for that.
Just create a *.bat file with this content, you have to change COM6 to whatever COM port your Arduino got assigned:
"C:\Program Files (x86)\Arduino\hardware\tools\avr\bin\avrdude.exe" -C "C:\Program Files (x86)\Arduino\hardware\tools\avr\etc\avrdude.conf" -c arduino -P COM6 -b 19200 -p t25 -U flash:r:ultracic_read.bin:r
pause
To change the CIC type just edit the value at Offset 0x38 with an hexeditor:
0x60 = 6102
0x61 = 6103
0x62 = 6106
0x63 = 6101
0x64 = 6105
0x68 = 7101
0x69 = 7103
0x6A = 7106
0x6B = 7102
0x6C = 7105
As an alternative you can also compile the switchable ultraCIC II from its source code
Next create a second *.bat file with this content to perform the flashing, once again you have to adjust COM6 to whatever COM port your Arduino got assigned and also change the filename according to your hex file:
"C:\Program Files (x86)\Arduino\hardware\tools\avr\bin\avrdude.exe" -C "C:\Program Files (x86)\Arduino\hardware\tools\avr\etc\avrdude.conf" -c arduino -P COM6 -b 19200 -p t25 -U flash:w:ultracic.bin
pause
Adding an eeprom chip:
If your repro only has a SRAM save chip you can salvage an eeprom chip out of a real N64 game and solder it into your repro like that:
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Cart Reader V5
Overview
Supported Systems
List of user-created Adapters
Community Discord Server
Build Guide
Recommended Tools
What to order
How to build
More Information
How to order a PCB
How to flash the Arduino
Flashing the snesCIC
Preparing the SD Card
Automatic Voltage Selection
Real‐Time Clock
Advanced
Troubleshooting
Calibrating the ClockGen
Designing your own Adapters
Serial Monitor
Savegame Conversion
Older Revisions
About
Cart Reader V4
Cart Reader V3
Cart Reader V2
Cart Reader V1
Firmware Archive
Nintendo 64
Read N64 cartridge
Reading a Controller Pak
Reflashing N64 Repros
Reflashing a Gameshark
Super Nintendo
Reading SNES/SFC carts
Reflashing NP carts
Reflashing SNES/SFC Repros
Reflashing BSX 8M carts
NES and Famicom
Dumping NES Games
Adding auto mapper to a game
Game Boy
Reading a Game Boy rom
Reflashing NP GB Memory carts
Writing custom flashcarts
Game Boy Advance
Reading a GBA save game
Reflashing GBA repros
SEGA
Reading Mega Drive Genesis games
Reading Master System games
Other
Flashrom Programmer
Flash-Adapter
AM29F016-AM29F032
MX29F1610
MX29L3211
MX29LV160
MX29LV320
S29GL032
39F040 PLCC32