Please note, the Tang Nano 20k is *not* included.
Cheapest source for these is probably aliexpress.

This is a development board for the Tang Nano 20k whose purpose is to emulate Acorn computers, but it could serve as a more general dev board for your own projects.
With the TangNano20k Multiboot firmware available on Github, it supports:

* Core 0 - BeebFpga (BBC Micro)

* Core 1 - BeebFpga (Master)

* Core 2 - ElectronFpga (Acorn Electron)

* Core 3 - AtomFPGA (Acorn Atom)

The 4 cores are selected with the JP5 first two pins, or by long pressing a button on the Tang Nano.

I use this in a BBC Micro B with a broken motherboard reusing the PSU & Keyboard (Video ULA died + other problems)

The BBC Micro Keyboard works with a BBC to PS/2 adapter (I'm selling a few of these in another listing)

Inputs are for two joysticks and a PS/2 keyboard.

There's also a connector for PiTubeDirect for co-processor support (this cannot be used at the same time as VGA)

Outputs are HDMI, VGA, S/PDIF, Audio L/R and TOSLink.

The SD card on the Tang Nano can be used as a hard drive in all the cores.

These cores go beyond just basic emulation and support extra hardware.

Searching for Tang Nano 20k Dock and BeebFPGA should glean all the info you need to get going.

BeebFPGA - Tang Nano 20k Dock Board - Emulate BBC Micro, Master, ATOM, Electron

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