BackBit Pro

The BackBit Pro and adapters.

The BackBit Pro is a universal SD card-based cartridge capable of interfacing with over 40 different consoles and vintage computers via inexpensive adapters. The range of systems covers many platforms, including the Atari 2600 through 7800, Sega Master System and SG-1000/SC-3000, many Commodore systems, Intellivision, ColecoVision, and many vintage PCs. For some of these systems (i.e. SG-1000/SC-3000, Super Cassette Vision), the BackBit Pro is the first cartridge which can load ROMs over SD card.

Features:

• SD-based ROM loading for a ton of systems
• Value savings versus buying single flash carts for each system
• Built-in troubleshooting tools at the press of a button
• Instant loading
• Real-Time Clock (RTC) on-board
• Many Commodore 64-specific features
• Other built-in features (Atari 7800 POKEY emulation, Odyssey² voice emulation, PC-6001 RAM expansion, etc)
• Some systems have a "DIY" version that comes disassembled, allowing you to solder it yourself and save a few bucks

The official documentation can be found in this PDF, firmware updates can be found on the BackBit.io website, and further support can be found on the BackBit forums.

Usage

For each console, there is an adapter board that plugs into the main unit to adapt the pins and also allow the cartridge to automatically detect what platform it's plugged into. From bootup, it will show a splash screen and then dump you at the top-level folder of the FAT32-formatted SD card for you to navigate down your folder structure to select a game and launch it. There is no console-specific setup needed, it works out-of-the-box and just relies on you choosing a ROM that your system supports.

Controls vary per console, but are generally:

• Up/Down: Navigate items on current page.
• Left/Right: Navigate pages.
• Button/Enter: Choose selected item.
• 2nd Button/Delete: Navigate to previous folder.
• Character keys: Search for a particular title in the current folder.
• 1-4 Keys: May open context menus (Utilities, Properties, Saves, Tools). May need to hold Ctrl/Shift while pressing the key.
• Button on top of cart: Hold while powering on until LED blinks to access Diagnostic Menu.

The BackBit Pro main menu on the Atari 7800 with folders for 7 consoles on the SD card.

Inside a console subfolder.

Diagnostics

The Diagnostic Menu for Atari 7800.

The following systems support running a diagnostic test when booting the console while holding the button on the BackBit Pro until the LED begins flashing. It may take 10+ seconds to reach this state. Generally, this test is the official one, but may be a community one.

• Commodore: C64, C128, VIC-20, Plus/4, C116 and C16
• Atari: 8-Bit, 2600, 5200, 7800 (for 5200, press button again to access v2.3 diagnostics)
• TI-99/4A
• CoCo
• ColecoVision and ADAM
• Amstrad CPC
• ZX Spectrum
• MSX
• Intellivision
• Bally Astrocade
• Sega Master System

Accessories

• BackButton — A button that plugs into the BackBit cartridge to allow you to return to the main menu
• Intellivision Adapter Sleeve

Troubleshooting

• Black screen
  • Ensure that your console can play a regular cartridge.
  • Ensure that the cartridge is oriented properly. Generally, the BackBit logo on the cartridge will face you, unless the adapter specifies "WRONG WAY" on it when facing you.
  • Reflow the cartridge port pins. Even if it can play a regular cartridge, it's possible that some of the signal lines are disconnected that a normal cartridge doesn't use, but the BackBit requires.
• Diagnostic Menu stuck on error screen
  • If you are stuck on an error screen of the Diagnostic Menu, power off the console, remove the power cable for 30 seconds, then re-insert it and try again.