This is an Acorn Electron, but not any Acorn Electron. You might notice the cable coming out of the back, that's HDMI.
RISC OS Pico, a cut down version of RISC OS specifically for programming. It is running BBC BASIC, so you can just type in good old BASIC programs.
My thanks to John Dale who introduced me to RISC OS Pico and suggested pairing it with the Acorn Electron USB keyboard.
USB Keyboard Controller Kits are available from my Sell My Retro store: