[PDF] 6502 instruction set timings

These instructions are always of 2 bytes length and perform in 2 CPU cycles, if the branch is not taken (the condition resolving to 'false'), and 3 cycles, if  Instructions by Type · Instructions in Detail; " · Primer of 6502 Arithmetic Autres questions
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  • What is the length of instructions in 6502?

    The 6502 has one main 8-bit accumulator register and two auxiliary 8-bit index registers called X and Y. The index registers are often used as array subscripts when referencing memory. Instructions are one, two, or three bytes in length.

  • Is the 6502 still used?

    As one of the most widely used microprocessor architectures of all time, the CMOS related form of the 6502 developed by the Western Design Center is still in production today, with an estimated six billion units so far produced.

  • Which is faster Z80 or 6502?

    Since most memories perform write operation slowly than the read one, we can say that if we have a specific RAM we can use it with Z80 that runs four times faster than 6502. And since it was the RAM speed that was the bottleneck of computer building at times of Z80 and 6502, a computer with Z80 was faster.
  • 6502 and 6512 processors could address 64KB of memory, other CPUs in the family could address up to 8 KB.
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