From NeoGeo Development Wiki
The 68k (AKA 68000, MC68000, 68HC000) is a 16bit big-endian CPU designed by Motorola, found in all NeoGeo systems as the main processor. It runs at 12MHz.
- 8, 32-bit data registers and 8, 32-bit address registers
- 7 interrupt levels
- 56 instructions
- 14 addressing modes