@mitu

Thanks!
Unfortunately,

jstest /dev/input/js0

does not trigger the turbo button, so I think it is an internal controller button. All other buttons trigger.

@mitu Is the Retroarch version the number shown in the bottom left corner of RGUI, along with the currently loaded core? If so, mine is on 1.8.8 somehow. If not, where can I check my current RA version?

Yeah, so I now updated to RA version 1.10 (d'oh) and I can see the menu entries in the aforementioned places.

Setting turbo mode to single button (hold) and turbo default button to X (my preferred button) still doesn't make it work as I intend. For instance, 1944 still charges up a shot when holding down the button instead of rapid firing. single button (toggle) does work as I would expect it to, though.

What am I doing wrong?

EDIT: Okay, got it. After updating RA, if I put

input_turbo_period = "6" input_duty_cycle = "3" input_turbo_mode = "2" input_turbo_default_button = "0" input_player1_turbo_btn = "3"

into my cfg file, button 3 does function as a turbo button, WITHOUT modulating any other buttons, so I guess the previously linked post was correct after all, I was just rocking an older version and didn't realize it.

Thanks to all respondents for bearing with me!

@J8sonMesser great theme Jason, really like how different panels are setup. can't wait for a release candidate :)

try turning either auido sync or hard gpu sync on in the retroarch settings

@mitu No, I did it but the behaviour is still the same, as the 8bitdo N30 pro (with the difference that it doesn’t have the TURBO button).

USB >> 8Bitdo NES30 Arcade
Bluetooth >> szmy-power Ltd.Joypad

@mediamogul thanks for the reply.

Thanks for the tip.
Could you explain what do you mean exactly by : "using the RGUI I assigned the enable Turbo function to the same button I want to apply the Turbo function"?
I cannot find how to do this in RetroArch.

So far I created the cfg file for the game :
input_player1_turbo_btn = 1
input_player2_turbo_btn = 1

And I put this code retroarch.cfg :
input_turbo_period = 6
input_turbo_duty_cycle = 3

Is there some way I could give myself a turbo button without switching emulators or buying a new controller?

another thing you can do is change the retroarch video driver to dispmanx which is said to save 1 frame off the input latency. i haven't personally done this as it has some side-effects (no shaders, no OSD, no screen rotate)

@fun4stuff good you solved it! :-)