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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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英文字典中文字典相關資料:
  • 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
  • 6502. org: The 6502 Microprocessor Resource
    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
  • Build a 6502 computer
    In this video series, I'll build a basic 6502 computer with an LCD display and a few buttons, explain how to program it in assembly, and write a game or two This series is in progress and more videos are on the way soon!
  • MOS 6502 - CPCWiki
    The 6502 microprocessor is an 8-bit CPU with an 8-bit ALU and a 16-bit address bus capable of direct access to 64KB of memory space Like the Z80, the 6502 is a little-endian CPU, meaning it reads 16-bit values with the least significant byte first, followed by the most significant byte
  • Easy 6502 by skilldrick - GitHub Pages
    A full list of the 6502 instruction set is available here and here (I usually refer to both pages as they have their strengths and weaknesses) These pages detail the arguments to each instruction, which registers they use, and which flags they set
  • MOS Technology 6502 microprocessor family - CPU世界
    MOS Technology 6502 and other 650x 651x processors are a family of inexpensive 8-bit microprocessors 6502 and 6512 processors could address 64KB of memory, other CPUs in the family could address up to 8 KB Stack size of the 6502 was limited to 256 bytes
  • The 6502 Microprocessor - Gamings Unsung Hero - Retro Reversing
    In this detailed technical presentation from the 27th Chaos Communication Congress, Michael Steil explores the inner workings of the MOS 6502 processor, the chip powering iconic systems like the Apple II, NES, and Commodore 64
  • MOS Technology 6502: A Historical Overview and Technical Analysis
    The MOS Technology 6502 microprocessor is a cornerstone of computing history, representing a breakthrough in affordability and performance Its innovative architecture, versatile instruction set, and widespread adoption in various applications have left an indelible mark on the tech landscape
  • C74-6502 CPU – A Homemade TTL 6502
    The C74-6502 is a homemade implementation of the venerable MOS 6502 microprocessor The 6502 was revolutionary in its time, and widely adopted in early home computers and gaming consoles
  • MOS Technology 6502 - TekWiki - w140. com
    The MOS Technology 6502 (P N 156-1425-00) is an 8-bit microprocessor monolithic integrated circuit (40-pin) introduced in 1975 and was originally developed by a team led by Chuck Peddle at MOS Technology (later purchased by Commodore)





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