The NeoGeo, stylised as NEO・GEO, also written as NEOGEO, is a cartridge-based arcade system board released on April 26, 1990, by Japanese game company SNK Corporation. It was the first system in SNK’s NeoGeo family.

The NeoGeo was marketed as 24-bit, its CPU is technically a 16/32-bit 68000-based system with an 8/16-bit Z80 coprocessor, while its GPU chipset has a 24-bit graphics data bus. You can read more about it here.