Doesn't the MiSTer core/emu already offer auto-fire from the config? Retroarch has a function to set a button to auto-fire on/off but that would not help you when using a PCE/TG mini pad since no extra buttons are present. (I guess that's why you asked)
While MiSTer has the autofire, it's not exactly accurate to the original hardware of TGX-16 - in fact it tends to even drop frames during autofire, making it inconsistent. MyLifeInGaming's video on MiSTer FPGA's TGX16-core documents this on
here.. Probably being a perfectionist purist here, but I've been curious of the Turbo Pad to join next to my other gamepads closing as much to the original controllers as possible.
![LOL :lol:](https://www.pcenginefans.com/forum/Smileys/default/icon_lol.gif)
Retroarch's Beetle PCE looks to be pretty accurate but I've moved away from using RetroArch a long time ago due being kind of cumbersome to use with having to adjust input latency options among other things more than actually sitting down to play the games. I might explore the controller there though.
But yeah, mainly just wanting to get this controller for not only TGX-16-games but possibly try other systems with 2-button configurations like NES and Sega Master System on both MiSTer and Retroarch.