Sega's 16-bit contender ran on a Motorola 68000 — the same CPU class as the era's workstations and arcade boards — with a Z80 kept on board to run sound and stay compatible with the Master System. Its FM synthesis gave it a punchy, distinctive voice and the 'blast processing' swagger.
The Four Natures
each piece emerges by one of four natures
The Idea
the three-beat story
The Motorola 68000 at ~7.6 MHz was a genuine 16/32-bit processor, the same family powering Amigas and arcade hardware. It gave the Genesis fast, arcade-style action and a clear marketing edge in raw speed.
A second processor, a Z80, handles sound and provides Master System backward compatibility (via an adapter). The 68000 commands; the Z80 assists — a deliberate two-brain split.
The Yamaha YM2612 does six channels of FM synthesis, joined by an SN76489 for simple tones. FM gave the Genesis its signature gritty, brassy sound — unmistakable against the SNES's sampled style.
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
16/32-bit · ~7.6 MHz.
sound + Master System compatibility.
320×224 · 61 colours on screen from 512 · 80 sprites.
6 FM channels + 4 PSG.
plus cartridge ROM.
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 main CPU, the Z80 co-processor, the VDP, and the YM2612 FM audio are documented hardware.
- Flagged: 'blast processing' was a marketing term, not a real feature — noted as branding, with the genuine speed coming from the 68000's clock.
Render, Not Invent
sourced
- Summarized from the public technical record for the SEGA GENESIS · MEGA DRIVE; 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 (7)
