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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关资料:


  • MOS Technology 6502 - Wikipedia
    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 in computers much cheaper
  • 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
    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
  • 6502 Instruction Set - mass:werk
    The accumulator is the main rgister of the 6502 Its content is typically used by the arithmetic logic unit (ALU) for the first operand and results are deposited in the accumulator again
  • 5 U. S. Code § 6502 - Executive agencies telework requirement
    establish a policy under which eligible employees of the agency may be authorized to telework; determine the eligibility for all employees of the agency to participate in telework; and notify all employees of the agency of their eligibility to telework
  • 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
  • www. Visual6502. org
    The first of our projects is aimed at the classic MOS 6502 processor It's similar to work carried out for the Intel 4004 35th anniversary project, though we've taken a different approach to modeling and studying the chip
  • 26 U. S. Code § 6502 - Collection after assessment
    “The amendment made by this subsection [amending this section] shall apply to levies issued after the date of the enactment of this Act [Nov 10, 1988] ”
  • What is the 6502? – 6502
    What is the 6502? The 6502 is an 8-bit microprocessor that was and still is, incredibly successful When launched in 1975, it was the cheapest microprocessor on the market and forced the competition to reduce their prices





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