Feature Request: Support for Amiga via Atari 2600 Adapter Firmware (2-Button Mode)

[CaptainHIT]

Hi! First of all, thanks for the amazing project.

I wanted to propose an idea for improving the Atari 2600 Bluetooth adapter firmware to make it compatible with the Commodore Amiga (and possibly other retro computers like the Atari ST and C64).

Background:
I’ve tested several BlueRetro-compatible Bluetooth adaptors, specifically the Atari 2600 and SMS versions bought from Aliexpress:

• Atari 2600 Adapter: Works well but only supports one button.
• SMS Adapter: Doesn't work at all on Amiga.
• MD Adapter: Doesn't work at all on Amiga.

I use a Nintendo Switch Pro Controller and a HoneyBee Sega Master System Control Pad for testing.

• The HoneyBee works perfectly on my Amiga 1200 with native two-button support. So why shouldn't work the SMS Adapter too?

The DE-9 joystick pinouts for the Atari 2600 and Commodore Amiga are identical:

References:

• https://wiki.icomp.de/wiki/DE-9_Joystick
• https://allpinouts.org/pinouts/connectors/input_device/mouse-joystick-amiga-9-pin/
• https://allpinouts.org/pinouts/connectors/input_device/mouse-joystick-atari-9-pin/

Feature Request:
Would it be possible to:

• Modify the Atari 2600 firmware to support a second button (for Amiga compatibility)?
• Optionally, rebrand the modified firmware as a “Retro Computers” mode, so that it’s distinct and doesn’t interfere with Atari 2600 behavior.
• The goal is to flash this updated firmware to the existing Atari 2600 adapter and use it on the Amiga with full 2-button support.

I read through these discussions:

• Commodore Amiga 500, 600 and 1200 #973
• Amiga CD32 full support in the future ? #554
• Blueretro on Amiga #305
  But they mostly address custom hardware builds or firmware modes not directly related to Amiga compatibility using third-party ready-made adapters.

Would love to hear if this could be possible with the current hardware + minor firmware tweaks!

Thanks again for all your great work!

[darthcloud]

I'm not selling those adapter, but they all use the same firmware either the Parallel 1P or the Parallel 2P one.

If you need two button the existing FW already handle that you just need to physically wired the BR output to the right pin.