Commodore Amiga

Processor, which initiated the revolution in 1980

6502 is a microprocessor with 8-bit address bus 16 bits, designed by Chuck Peddle in 1975. Along with the Zilog Z80, which caused a number of joint projects that lead to the personal computer revolution in 1980.

Despite the low-speed 1 MHz clock, the performance of 6502 was actually competitive with other clocks in the higher end 1970 and early 1980 (Zilog Z80, for example). Scored only slightly – a record 8-bit accumulator (A), two registers 8 Bit Rate (X and Y), write 8-bit processor state (P), 8-bit stack pointer (S), and the program counter 16-bit (PC) and a set of simple instructions. 16-bit address, but is authorized to assign up to 64 KB of memory.

One of the first computers to use the 6502 was Apple I (1976), the Apple II, Commodore PET, Atari and the BBC Micro. The famous Commodore 64 used MOS 6510, which was the successor of the 6502 E / S digital port and three state bus. 6507, simplified version of 6502, is featured in a film about the Atari 2600 8502 was a 2-MHz 6502 version that was used in the Commodore 128 Millions of computer systems with the CPU 6502 provided in 1980.

6502 was very popular among programmers assembler (mainly because that if its simplified design), and even 31 years later, now used for teaching assembly and computer architecture at universities.

Several companies have produced 16-bit since 6502, for example, Western Design Center, 65C816 (still widely used today) or (not quite compatible) Mitsubishi 65.816. The report contains Synertek SY6516 was never released. 32-bit contain derivatives of terbium W65T32 Western Design Center, 6502 chip compatible with the address bus 32-bit, 16-bit data bus and a set of variable-length instructions.

Homecomputer 6502 clearly dominates the 8-bit and the world of Video Games, but then Apple, Commodore, Atari, and all changes in the architecture Motorola 68k with the next-generation 16-bit (Macintosh, Amiga and ST). Although architecture disappear in the 6502 movie homecomputer game market, is still not a popular concept, since remains the core of the microcontroller chip a lot today.

About the Author

Jos Kirps is the creator of several software and web projects, including Galaxiki, a fictional galaxy where site members can get their own solar system and the Open Source CorneliOS webOS.

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