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6502    
An eight-bit {microprocessor} designed by {MOS
Technology} around 1975 and made by {Rockwell}.

Unlike the {Intel 8080} and its kind, the 6502 had very few
{registers}. It was an 8-bit processor, with 16-bit {address
bus}. Inside was one 8-bit data register ({accumulator}), two
8-bit {index registers} and an 8-bit {stack pointer} (stack
was preset from address 256 to 511). It used these index and
stack registers effectively, with more {addressing modes},
including a fast zero-page mode that accessed memory locations
from address 0 to 255 with an 8-bit address (it didn't have to
fetch a second byte for the address).

Back when the 6502 was introduced, {RAM} was actually faster
than {CPU}s, so it made sense to optimise for RAM access
rather than increase the number of registers on a chip.

The 6502 was used in the {BBC Microcomputer}, {Apple II},
{Commodore}, {Apple Computer} and {Atari} {personal
computers}. {Steve Wozniak} described it as the first chip
you could get for less than a hundred dollars (actually a
quarter of the {6800} price).

The 6502's {indirect jump} instruction, JMP (xxxx), was
{broken}. If the address was hexadecimal xxFF, the processor
would not access the address stored in xxFF and xxFF 1, but
rather xxFF and xx00. The {6510} did not fix this bug, nor
was it fixed in any of the other {NMOS} versions of the 6502
such as the {8502}. Bill Mensch at {Western Design Center}
was probably the first to fix it, in the {65C02}.

The 6502 also had undocumented instructions.

The {65816} is an expanded version of the 6502.

There is a 6502 {assembler} by Doug Jones
which supports {macros} and conditional features and can be
used for linkage editing of object files. It requires
{Pascal}.

See also {cross-assembler}, {RTI}, {Small-C}.

(2001-01-02)


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  • MOS Technology 6502 - Wikipedia
    The MOS Technology 6502[3] is an 8-bit microprocessor that was designed by a small team led by Chuck Peddle for MOS Technology and was launched in September 1975 The design team had formerly worked at Motorola on the Motorola 6800 project; the 6502 is essentially a simplified, less expensive and faster version of that design using depletion-load NMOS technology that made using the microchip
  • 6502. org: The 6502 Microprocessor Resource
    Welcome 6502 org is a resource for people building hardware or writing software for the 6502 microprocessor and its many relatives, such as the 65C02, 65C816, and Mitsubishi 740 series For over 25 years, we have strived to be the largest and best source of 6502-related information in the world Features
  • Build a 6502 computer
    Build a 6502 computer Learn how computers work by building and programming a computer with the classic 6502 microprocessor This was the first truly low-cost microprocessor that started the personal-computing revolution Versions of 6502 found their way into the Atari 2600, Apple II, Nintendo Entertainment System, Commodore 64, Atari Lynx, BBC Micro and many other computers and game consoles
  • Microsoft Releases Historic 6502 BASIC | Microsoft Open Source Blog
    Explore the original 6502 BASIC—now open source! Dive into retro code, history, and emulators Fork it, run it, and relive computing's roots
  • www. Visual6502. org
    of the 6502 CPU and other chips! Welcome to Visual6502 org! Here we'll slowly but surely present our small team's effort to preserve, study, and document historic computers We aim to present our work in a visual, intuitive manner for education and inspiration, and to serve as a solid verifiable reference for classic computer systems
  • MOS 6502 - CPCWiki
    The MOS Technology 6502 is an 8-bit microprocessor designed by Chuck Peddle in 1975 for MOS Technology (later purchased by Commodore) Along with the Zilog Z80, it sparked off a series of computer projects that would eventually result in the home computer revolution of the 1980s The 6502 design was originally second-sourced by Rockwell and Synertek and later licensed to a number of companies
  • 6502 Instruction Set - mass:werk
    The 6502 MPU features three basic compare instructions in various address modes: The various compare instructions subtract the operand from the respective register (as if the carry was set) without setting the result in the accumulator (rather, leaving its content unchanged) and adjust the N, Z, and C flags as with any ordinary subtraction
  • The MOS 6502: How a $25 Chip Sparked a Computer Revolution
    The MOS 6502: How a $25 Chip Sparked a Computer Revolution Retro Register is a new All About Circuits column that explores technologies of the past and the lessons they hold for the future Come along for our first deep dive on the MOS 6502
  • Team 6502
    One of the most influential microprocessors ever designed, the MOS 6502 is credited with ushering in the most rapid democratization of technology in human history: the personal computing
  • Happy Birthday 6502 - Hackaday
    The MOS Technology 6502 is a microprocessor which casts a long shadow over the world of computing Many of you will know it as the beating heart of so many famous 8-bit machines from the likes of C…
  • Easy 6502 by skilldrick - GitHub Pages
    Introduction In this tiny ebook I’m going to show you how to get started writing 6502 assembly language The 6502 processor was massive in the seventies and eighties, powering famous computers like the BBC Micro, Atari 2600, Commodore 64, Apple II, and the Nintendo Entertainment System Bender in Futurama has a 6502 processor for a brain Even the Terminator was programmed in 6502 So, why





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