Board revision 3

The board we shipped from mid June 2025 until board revision 4 replaced it. It is no longer sold, and it is still supported: it runs firmware v4.0.0, the same firmware as board revision 4.

Board revision 3: a long green board with castellated pads along both sides and a USB-C connector at the top.

Supported

RP2350A microcontroller, firmware v4.0.0. Shipped from mid June 2025 to October 2026.

Your ROM Emulator board, on top of the carrier board, is this one if:

  • A wider board soldered onto the carrier by castellated pads.
  • Red power LED, plus green and orange LEDs.
  • INFO.TXT on its drive says Board variant: RP2350A.

Read the guides in this order

  1. Getting Started What comes in the kit, the ROMEMUL drive, copying TOS images, and installing the firmware.
  2. Upgrading to v4.0.0 Move from firmware v3.x to firmware v4.0.0 and keep your TOS images.
  3. Hardware Installation Opening your Atari and fitting the board.
  4. User Guide The LEDs, the SWITCHER, and rescue mode, day to day.
  5. Advanced Settings Every setting in CONFIG.TXT.
  6. Troubleshooting What to check when the drive, the Atari or the SWITCHER does not behave.

Still on firmware v3.x? Start with Upgrading to v4.0.0: it keeps your TOS images.

Archived guides for firmware v3.x

Firmware v3.x is replaced by firmware v4.0.0. These guides describe firmware v2.x and v3.x, and are kept for reference:

For every board

Compatibility lists the TOS versions and computers tested, the FAQ answers the most common questions, and the Changelog has what changed in each firmware.