For the unaware, an FPGA stands for Field Programmable Gate Arrays, which in layman's terms means that the hardware is made up of a wide variety of "arrays" that allow the programmer to modify the way in which the hardware itself works, basically reconfiguring the hardware to achieve or meet certain requirements, and in some cases, to mimic other hardware, which in the case of the MisterFPGA, it mimics the original hardware of several video game consoles through "cores", which are developed by many contributors and cover a wide range of consoles, like the older Intellivision or Atari consoles, all the way up to the 5th generation of consoles, which include the original PlayStation, and now with the latest update, the Nintendo 64 as well. All of this with compatibility with several controllers as well as clean HDMI output and several other features.
The main objective of the MisterFPGA is to recreate the original consoles hardware configurations through its FPGA to run games for the available consoles, since it is basically reconfiguring the FPGA's hardware to that of the original console's hardware and how it behaved, allowing for the most accurate way to experience either original and officially released games for the consoles, or even newer homebrew titles developed for them or romhacks as well. Not only that, but the MisterFPGA has proven to be a resourceful tool for those that want their homebrew games or romhacks to be compatible with real hardware.
People who already have their hands on a MisterFPGA can run the updater to download the newly added Nintendo 64 core and start playing their N64 library.
MisterFPGA GitHub page