Board revision 4

The SidecarTridge TOS Emulator board we sell now. Every kit shipped from 1 November 2026 comes with it. It runs firmware v4.0.0, the same firmware as board revision 3.

Board revision 4: a short green card with a gold edge connector at the bottom, a USB-C connector on its left side, and BOOT and RESET buttons.

On sale

RP2350B microcontroller, firmware v4.0.0. Shipped from 1 November 2026.

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

  • A short card with a gold edge connector along its bottom edge.
  • USB-C connector on its left side.
  • INFO.TXT on its drive says Board variant: RP2350B.

Read the guides in this order

  1. Getting Started What comes in the kit, the ROMEMUL drive, copying TOS images, setting up rescue mode without the RESCUE button, and installing the firmware.
  2. Hardware Installation Opening your Atari and fitting the board, step by step for each motherboard.
  3. User Guide The LEDs, the SWITCHER, and rescue mode, day to day.
  4. Advanced Settings Every setting in CONFIG.TXT, including the ones only this board has.
  5. Troubleshooting What to check when the drive, the Atari or the SWITCHER does not behave.

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.