The 6502 is the most consequential cheap chip in computing history. At about a quarter the price of its rivals, this tiny 8-bit processor powered the Apple II, the Commodore 64, the Atari machines, the BBC Micro — and, in derived form, the NES. It put computers and consoles in millions of homes.
The Four Natures
each piece emerges by one of four natures
The Idea
the three-beat story
Launched at around 25 dollars when comparable CPUs cost well over 100, the 6502 made the personal-computer and console boom economically possible. Affordability, more than raw power, was its revolution.
A minimal transistor count, a fast 'zero page' for quick variable access, and an efficient instruction set let the 6502 do a lot with little. Programmers loved its directness; its quirks (and undocumented opcodes) became folklore.
Apple II, Commodore 64 and PET, Atari 2600/400/800, BBC Micro — and the NES's Ricoh 2A03 is a 6502 core. A single inexpensive design seeded a whole era of computing and gaming.
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
MOS Technology · 1975.
typical.
64 KB space.
vs $100+ rivals.
and more.
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 6502's 8-bit design, low price, zero-page addressing, and use across the Apple II/C64/Atari/NES are documented.
- Flagged: the NES uses a 6502 core (the Ricoh 2A03) with decimal mode disabled, not a stock 6502 — clarified, a common simplification.
Render, Not Invent
sourced
- Summarized from the public technical record for the THE MOS 6502; 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)
