Trying to find a way to play this the "right" way on an emulator...
As you all know, in the arcade, this is a twin stick... left stick controls movement, right controls firing. It can be set up on the 7800 by having two joysticks, one in the player one port and one in the player two port, then using them just like the arcade (I'm guessing it works like in the arcade at least, haven't actually tried it on real hardware). And of course there's the awesome custom controllers that combine the controls into one easy to handle controller with two d-pads.
I've been using a Playstation 2 controller, with a PS1/PS2 to USB adapter to play emulated games on my laptop. In MAME, I can configure the arcade Robotron to use the two thumbsticks on the controller as the two joysticks and it works decently. I'm still not that good at the game, but it feels pretty "right." The emulator I'm using to play 7800 games is RetroArch, though, and there doesn't seem to be a way to configure it to have controls for both player 1 and 2 go to the same controller. I've reached out on a discord channel that has helped out on RetroArch problems before, but the only response I've gotten is that they either don't know or don't think you can. One suggestion was to set both players as going to keys on the keyboard, then using that, but I think that would be less satisfactory than the method I'm having to use.
Any thoughts? Anyone here good with RetroArch that might know a work around?