The Motorola 68000 was the CPU of a generation: a clean 16/32-bit design with a large, flat memory model that powered the Amiga, the Atari ST, the early Macintosh, a vast swathe of arcade boards, and the Sega Genesis and Neo Geo. Where 16-bit gaming got serious, the 68000 was usually behind it.
The Four Natures
each piece emerges by one of four natures
The Idea
the three-beat story
Internally 32-bit with a 16-bit data bus, sixteen 32-bit registers, and a large flat address space — far more elegant and capacious than the segmented 8-bit world before it. A joy to program after the 6502 and Z80.
Capcom's CPS boards, countless other arcade machines, the Amiga, the Atari ST, and the original Macintosh all ran on 68000-family chips — the default serious processor of the 1980s.
The Sega Genesis and the Neo Geo are built on the 68000, and the Sega Saturn even used one as a sound CPU. When console gaming made its 16-bit leap, the 68000 was usually the engine.
The Teardown — Click a Block
the machine, laid out as a block diagram — the main processor on top, the rest of the silicon beneath, buses showing what talks to what. Click any block to read its spec. An accurate architecture diagram (a teardown illustration, not a schematic).
The Spec Sheet
the headline numbers — the spec edition
Motorola · 1979.
data + address.
large flat memory.
Genesis · Neo Geo.
of the 1980s.
The Reckoning
the teardown, and the honesty about it
The Domain: Open It and Spec It
the teardown
- EXEREÚNESIS takes a real, made machine apart down to the chip and writes the honest spec — not a story-world but a technical anatomy.
- >One of a growing series of console teardowns; siblings link from the marquee.
Two-Layer Honest
datasheet vs lore
- Settled: the 68000's 16/32-bit architecture, flat memory model, and use across the Amiga/ST/Macintosh/arcades/Genesis/Neo Geo are documented.
- Flagged: it is '16/32-bit' — 32-bit registers and operations over a 16-bit external data bus; stated precisely rather than as a flat '16-bit' or '32-bit' label.
Render, Not Invent
sourced
- Summarized from the public technical record for the THE MOTOROLA 68000; the manufacturer and its engineers are cited, not minted.
- No ROMs, BIOS, or copyrighted code are reproduced. Emergents are physical components; the block diagram is an illustration, not a schematic.
The Roster
every chip and part as an ACI .agent — each a birth certificate & a nature (6)
