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An easy-to-miss, but pivotal, change has just been committed to the MAME source repository: https://github.com/mamedev/mame/tree/new68k

This is a brand new Motorola 68000 emulation core, using the actual 68000 microcode to generate the emulation code from a roughly 2400-line Python script.

Beyond having a positive impact on how granular MAME can get in emulating arcade games, this allows for cleaner handling of *any* system that used /DTACK. Low-level emulation of the CD-i peripheral controller is on the horizon.