I'm pretty sure this has not been mentioned previously.
CHIP-OTTO is a CHIP-8 interpreter/virtual machine for the Sinclair ZX Spectrum, ZX Spectrum Next and Cambridge Z88 microcomputers and web browsers.
CHIP-8 is an interpreted programming language, developed by Joseph Weisbecker. It was initially used on the COSMAC VIP and Telmac 1800 8-bit microcomputers in the mid-1970s. CHIP-8 programs are run on a CHIP-8 virtual machine. It was made to allow video games to be more easily programmed for these computers.
https://retrobits.itch.io/chip-otto