NES Multitap random button Presses on NES Frontloader

[raschinger]

BlueRetro firmware version

1.9.2

BlueRetro firmware specification

HW1

BlueRetro firmware variant

Universal

BlueRetro hardware type

External adapter with detachable cord

Manufacturer

Self made 2 player dongle

System used

Nintendo Famicom NES

Bluetooth controller brand & name

Switch, 8BitDo, Xbox series controller

What is problem? (only list ONE problem per report)

Recently built my own 2 port Dongle for the NES. I've tested the Multitap feature. And found the following behavior. Once the 3rd controller is connected to BlueRetro. I've observed random button presses on Player 2.

PXL_20240423_104054320.TS.mp4

What did you expect to happen?

I expect to get the Multitap feature working.

Attach files like logs or Bluetooth traces here

No response

[darthcloud]

Please provide schematic and BOM for me to review

[raschinger]

BR2NES.pdf

Please see attached.

2 Player mode is working flawlessly

[bixxewoscht]

I just tested this with NES Hub V2.1 (same one you have @darthcloud.
Same behaviour, 2 controller without four-score activated in the web-config work fine.
With four-score activated I experience the same inputs on controller 2. Both with only 2 controllers connected and also with 4 controllers connected.

[darthcloud]

On my AVFC I only get a few random press on P2 A button that's all using v24.04.

I actually just realized I got no way to run ROM on a NES. I don't have a FC to NES adapter (and none of the games that include one).

I might try to get a Gyromite cartridge, until then I can't really easily test.