Awesome Open Source
Awesome Open Source

Super Nt Jailbreak

Custom "Jailbreak" firmware for the Analogue Super Nt (regular and ghostly models) that allows loading ROMs from the SD Card slot and an expanded featureset.

Updating Firmware

Format a 2GB (or larger) SD card as FAT32 (FAT16 and exFAT are not supported). In Windows, you must use a tool for cards larger than 32GB, such as fat32format.

Unzip snt_firmware_verJB7.0zip into the root directory of your SD card. Be sure that there is only one firmware file there. Insert the card into your Super Nt and power on. The firmware will be flashed to the console. This process may take a few minutes.

While the firmware is flashing the LED will turn red and flicker, followed by a considerable pause and HDMI signal blackout. Do not power off. The main menu will boot when it has finished. Delete the firmware file from your card after flashing.

The Super Nt is protected from bricking as a result of firmware updates, but please still follow the above precautions to be safe.

Organizing ROMs

Create a folder called SNES at the root of your SD card, and drop your folders and subfolders of ROMs inside (see SmokeMonster's database for a curated list of valid SNES ROMs). The system will search for ROMs in the /SNES/ folder first, or the root directory of the SD card if there is no /SNES/ folder. The maximum number of files (ROMs and subfolders) that can be placed in a given folder is around 300-500, depending on the length of the filenames.

Running ROMs

Select browse SD card from the main menu. Hit enter on a filename to run it, or if it's a subfolder, it will enter said folder. The menu hotkey will return to the file menu from the game.

Saves

Saves will go into /SAVES/SNES/ by default. You can directly place an SD2SNES or Super Everdrive SD card in, and it will properly detect this by checking for the requisite save game folders, in this order:

  • /SAVES/SNES/ (default)
  • /SPED/SAVE/ (Super EverDrive)
  • /sd2snes/saves/ (SD2SNES)

The Super Everdrive uses a 32-kilobyte long save file no matter what, and is padded. This functionality is retained. It should be possible to swap your SD card into the unit from your SD2SNES or Super EverDrive and the saves will work fine, then it can be put back into said cartridge and it will find the updated saves (with a .sav file extension, other extensions are not recognized).

NEVER insert or remove cartridges while your Super Nt is powered on. Doing so may risk damaging the console and/or losing saves. It is good practice to backup saves before updating firmware.

When a game is exited to the menu, it will prompt you to save. Return to the file menu and save your progress before powering down. NOTE: The prompt to save is turned off by default, to enable it, open the menu (SELECT and DOWN), then navigate to MENU (START), then SYSTEM, then MENU OPTIONS. Make sure PROMPT WHEN SAVING RAM is selected.

CopySNES

CopySNES backs up (AKA "dumps") cartridge ROMs and save RAM to the SD card.

Click to expand full CopySNES instructions

CopySNES is designed to be an easy to use way to back up cartridge ROMs and save RAM data. Most types of cartridges are supported, and if it isn't specifically supported or for some reason the cartridge header is bad, the settings can be changed.

How to use it:

  • Power the system off
  • Insert cartridge
  • Power the system on
  • Select CopySNES on the tools menu

At this point, CopySNES will query the cartridge and grab the header and attempt to detect what kind of cartridge it is.

You have two options at this point:

  1. hit enter to accept the settings and proceed to saving.
  2. hit start to edit the detected settings

(note: editing the name will happen during the save step, skip to filename entry below)

If you wish to edit the settings, use up and down to select one of the settings, then use left and right to adjust it. You can select between 32 kilobytes and 16 megabytes of ROM to dump, and between 0 (i.e. none) and 32 kilobytes of RAM.

Finally, you can select the type of mapper it is, i.e. LOROM, HIROM, EXHIROM, or EXLOROM. There is also a FLAT setting which will let you dump the entire SNES cartridge space if desired. FLAT starts at address 00:0000 and will dump the specified amount of memory.

While you can dump say, 8 megabytes of LOROM or HIROM, doing so most likely won't be very useful.

This manual mode is useful when dumping things that do not have a valid or any header such as the Game Genie BIOS (it reports 0 kilobyte of ROM and is actually 64 kilobytes) or the Sufami Turbo (again, it reports 0 kilobyte of ROM even though it's really 1 megabyte).

When you are done adjusting the settings, and are ready to dump, hit select.

Filename entry:

At this point the filename can be edited. It will directly copy the ROM header name in here. For some Japanese titles, there may be no valid ASCII characters in the header (or if there's no header at all) so any invalid characters for a filename are replaced with spaces. If there's no name at all, it will default to "GAME". Use up/down to change the character's value and left/right to select a character. Press enter to accept the filename and begin the dumping process.

The game's actual size will be determined at this point (i.e. a 2-megabyte game reported in the header might only be 1.5 megabytes, so this will be detected now).

Finally, the ROM and RAM are dumped to the SD card.

Now that the dump is complete, you are returned to the tools menu. The system can be powered off and a new cartridge inserted to dump, and so on until all the carts are dumped that you wish to dump.

The following things have been tested:

  • LOROM (ROM + RAM)
  • HIROM (ROM + RAM)
  • EXHIROM (ROM + RAM)
  • SDD-1 (ROM + RAM)
  • SA-1 (ROM + RAM)
  • CX4 (ROM)
  • DSP1-4 (ROM + RAM)
  • S-RTC (ROM, RAM is dumped but it is unknown if it works)
  • ST010 (ROM)
  • ST011 (ROM)
  • ST018 (ROM)
  • OBC-1 (ROM + RAM)
  • SPC7110 (ROM + RAM, but RAM has not been verified to work)
  • GSU-1/2 (ROM + RAM)

(note: for SuperFX (GSU), the RAM is always dumped as 64 kilobytes. This is because games such as Yoshi's Island have RAM, but the headers for all the games show 0 kilobyte of RAM. This 'larger' RAM will work with the major emulators, and can be trimmed down later if needed.)

Note: Testing with no$sns it will not use the saves on certain games such as Chrono Trigger I don't know why, the saves are good and work on the Super NT itself.

Fonts

Since Super NT firmware version JB6.9, the System -> Font menu allows you to select your own font in place of those which come with the console. The load font option will bring you to the file browser. If you have a directory called /FONT/ at the root of your SD card, it will default to that directory to load a font file. The font must use an 8x8 text box and must be represented in binary in a 1-bit per pixel format. Each character will take eight bytes to represent in this format. The file must be 768 or 1024 bytes in size and use the extension .fnt. The characters in the file will have to start at ASCII 20 (space) and end at ASCII 7F (delete). Font files 1024 bytes in size will not show the first 32 characters which would be stored in the first 256 bytes of that file. A set of user-created fonts compiled by Sho is available here. Utilities to convert Analogue font files to/from bitmap files are available here.

Changelog

  • JB7.0 2021-02-22:

    • Added SPD HDMI packet to identify as "Super Nt"
    • Added Dejitter checkbox added to suppress the shorter scanline every other frame
    • Added option to press start to skip the bootup sequence
    • Fixed video settings (scanlines, etc) not applying when running games
    • Fixed non-visible top scanline in HDMI
    • Fixed non-centered picture when horizontal/vertical position sliders are centered
    • Fixed Final Fantasy III (US)/Final Fantasy VI (Japan) graphics corruption bug
    • Fixed Final Fantasy V graphics bug
    • Fixed Bahamut Lagoon graphics bug
    • Fixed CX4 shifter for faster wireframe sequences in Mega Man X2 & X3
  • JB6.9 2019-08-09:

    • includes all fixes from official firmware v4.9:
      • Added user font loading
      • Added RGB sliders for standby colour
      • Added SPC player
      • Fixed top missing scanline
      • Added new scanline system
      • Added DAC
      • Added light gun support with DAC
      • L/R audio input on cartridge was flipped
      • Fixed "you cannot use a mouse with this game" on Panic Bomber World
      • Fixed Star Wars pausing bug
      • Many small fixes and changes
    • plus:
      • Added DSP1,2,3,4 support
      • Added OBC1 support
      • Added ST010, ST011 support
      • Added CX4 support
      • Sped up file loading
  • JB6.6 2018-03-27:

    • includes all fixes from official firmware v4.5,
    • fixed: Star Ocean 96mbit works now.
    • changed menu operation so that if you enter the settings menu in the file browser, it can be exited back to the file browser by hitting select (or backing all the way out using the back button).
    • changed file browser operation so that if you attempt to back out of it, you get warned that the running game will be ended and you cannot save any more.
    • changed: Cheat codes is moved into the file browser settings menu.
    • added CopySNES. Lets you dump carts/save RAM to the SD card. Files are placed into /COPYSNES/. The directory is created if it does not exist. See the text file for full instructions.
    • added: in jailbreak mode, tools menu appears on the main menu which has CopySNES and cheat codes.
  • JB6.5 2018-03-04:

    • includes all fixes from official firmware v4.4, which should solve most DMA-related random crashes
    • adds a menu bounce option (reinstated)
    • adds a new Save? dialog box
    • fixes both SRAM bugs (firmware 6.4 only saved once and had a nasty corruption bug). Please test it again so we can be sure the save functionality works as expected. Any save made on the jailbreak firmware 6.4 should be considered as potentially corrupted and must be discarded
    • fixes glitch with some games disabling the return to menu shortcut
  • JB6.4 2018-02-14 Initial release: Happy Valentine's Day ❤️

Known Issues

  • some special-chip games are not supported,
  • game-specific bugs,
  • hotkey problems with 8bitdo receiver #12,
  • hq2-4x scaler settings slightly change the color pallet #78

Cores Supported

SNES/SFC

Problem Reporting and Community Chat

The custom firmware is not coded by SmokeMonsterPacks or frederic-mahe, but please do report problems here at Github for support. Priority will be given to jailbreak-specific problems (using ROMs through the SD card slot rather than through the cartridge slot). You can join the discord server if you want to chat with the Super Nt community.

Use at your own discretion. We are not responsible for any damage or data loss caused by custom firmware installation or use.


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