Merely days after the first alpha release, Wickerwaka, developer of the Irem M92 arcade core for the MiSTer FPGA has already updated this awesome core, twice! The first update added Ninja Baseball Bat Man to the working game list, and a fresh new one earlier today also makes vertical shooter Lethal Thunder playable.
Please note that being very early releases this core cannot be downloaded through Update_all, but files have to be downloaded from the official GitHub page and installed manually on your MiSTer FPGA‘s SD card.