@lootchamoneytho I believe so, however it's how each game is setup . In the "mame tab menu" there is often (not always) an option (dip switch) to control the coin slots.

@stoney66 said in Player 3 and 4 controls not working:

Which mame emulator?

I have close to your same setup, minipac for P1/P2 with real arcade sticks/buttons and two usb xbox style controllers. My issue was with advmame and was that the controllers were already mapped to p1/p2, and when I mapped my minipac to p1/p2 then both were setup on same player. The fix for me at least was to delete the mappings for p1/p2 first and then set minipac to p1/p2 and xbox ones to p3/p4.

If you are using lr-mame-2003 etc not sure if that would be the same problem but worth checking. There are also different roms for 2p vs 4p ones for simpsons and tmnt. Not sure about the other two. I never tried a 2p one, so not even sure it shows 4 players as an option on those.

Thank you for the heads up. I've managed to get this resolved. for my 4 player games I set it to use lr-mame-2003 instead of lr-fbneo. The mame2003 emulator is much easier to work with. Once the game loaded up I pressed tab on the keyboard and then amended the input for the game. I reconfigured the buttons for each player and now it works as expected.

NBA JAM threw me as if you want 2 players to play on opposing teams the joysticks have to be setup as player 1 and 3. Player 2 and 4 are on the usb gamepads as they are the team mates for player 1 and 3.

Instructions were added to liberatro document site:
https://docs.libretro.com/guides/netplay-multiple-controllers/

@mitu Thanks a lot. I gave it a few tries, using only one Xinmo, changing usb ports, no overclocking, wiring differently but it keeps on assigning new gamepad numbers to my controllers.

With only two controllers connected through one Xinmo I can make some games work correctly nevertheless, but as soon as I connect all 4 it's a mess all over the place when I launch the first game.

@dankcushions said in Best way to set up multitap?:

@lesk no, each system page in the wiki will have specific instructions to set up multitaps for a given system. eg https://github.com/RetroPie/RetroPie-Setup/wiki/Playstation-1#multitap-3-5-players

Sorry for late reply, but thanks! As I understand it, for the playstation you have to do some manual changes for each games that dosen't support analog etc.
But for Snes, Nes, Sega and Arcade I can just go in via the retroarch menu while playing a game and add multitap support and core save.

Thanks to all. I just bought a Pi 4. Mainly because it is more future proof. I will play around with Lakka for some time, waiting for Retropie to be fully compatible.

@allenpie Install the Joystick Selection tool from the link provided and you'll have an extra menu entry in the RetroPie menu for you to configure the controller/player mapping.

@caver01 That's true, I am also investigating udev and xrender as I was told by a friend that a rule could probably be defined to handle that behavior. Indeed, since the portable screen will be connected internally (inside the box) to the raspberry pi, we can know for certain which HDMI port is associated to the screen and therefore differentiate it from the other one which would be assumed to be an external screen.

EDIT: Actually, I realize now that contrary to USB ports, HDMI splitters only duplicate the input display to two outputs in an identical way, so I am no longer sure udev understands it is communicating with two different displays.

@caver01 @rbaker I am also investigating using a USB Power Bank as a UPS (which I read from over at http://raspi-ups.appspot.com/en/index.jsp). Some models have smart charge features and are able to serve while charging and feature two USB ports (which is useful to provide power to both the Raspberry Pi and the portable screen).

Controlling the power drop seems feasible using a voltage diviser and an analog digital converter bound to the Raspberry Pi GPIO (one reference among others: http://raspi.tv/2013/controlled-shutdown-duration-test-of-pi-model-a-with-2-cell-lipo).

A quick Amazon search provides results that I believe could do the trick (like http://amzn.eu/fAd5fRV which:

is pretty cheap (~20 bucks), has a 16.75A capactity, provides 5V outputs, provides 3A max on each of its 2 ports,

I am guessing this could be used as a UPS.

Just as a side note I have seen several interesting projects providing UPS boards for the Raspberry Pi. But they seem focused on powering it through the GPIO (as far as I understand) and therefore do not seem very appropriate to me if I want to power a portable screen as well.

Another side note to say that I don't have any stakes at Amazon (and my links aren't sponsored), it just seems convenient to provide examples :)

EDIT: changed the example provided for a more suitable USB Power Bank

thankyou sir.. got some working!

@tommeesawyer I know this is pretty old thread... I’m about to try 2 xin mo for 4 players plus a ultimatc trackball. Did you have any issues assigning 4 players in emulation station controller setup? All working good with mame and 4 player console games? (ex. Mario kart 64)
Hopin for some insight with this option rather than single player zero delay controllers taking up all 4 USB ports...

@edmaul69 hi. yes all changes were made within the RetroArch GUI. I checked QuickMenu -> Controls and from Settings -> Input. Both looked ok.

It could simply be a lag issue. I doubt that the Bluetooth receiver in the Pie3 is as robust as the PS4 one. For this reason I don't use more than 2 PS3 wireless controllers at a time.

The only related issue I could find is this one, but that's more about power draw from the controllers than Bluetooth lag:

https://retropie.org.uk/forum/topic/6756/solved-ps1-controllers-random-input

Morning,
I'm experiencing a similar problem when trying to do the same thing (2 pi's, 2players on each for TMNT in MAME) - where the client Pi will load fine and connect to the host but none of the controllers work once connected. Did this fix the issue?

Regards

@diqits Hello!

Just set one controller as a multitap device, on the emulator menu.
Press select and square to get to the menu options, go to input and set the controller type.

Sorry, i cannot be precise because i do not have here the raspberry pi.

Well I was going to add to this list but that's the single most extensive list of 4-player games I've ever seen. Thanks!