[PDF] 6502 sbc implementation

  • What is the maximum RAM for 6502?

    The 6502 is strictly an 8-bit architecture, with a single 8-bit accumulator register, and can access a maximum of 64K bytes of random access memory. Memory addresses are exactly 16 bits in length, because 216 = 65536 = 64K. Valid addresses range from 0 up to 65535.

  • Is 6502 big endian?

    The 6502 is a little-endian 8-bit processor with a 16-bit address bus. The original versions were fabricated using an 8 µm process technology chip with a die size of 3.9 mm × 4.3 mm (advertised as 153 mils × 168 mils), for a total area of 16.6 mm2.

  • How big is a 6502 transistor?

    The original 6502 manufactured in 1975 contained 3510 transistors and 1018 depletion-load pullups, in a die that was 0.168 inches × 0.183 inches (? 4.27mm × 4.65mm), produced on a 3” silicon wafer. The process used to create the 6502 was the N-channel Silicon Gate Depletion 5 Volt Process, aka the “019” process.
  • The 6502 has a SBC operation (subtract with carry) that subtracts two numbers and also subtracts the borrow bit. If the (unsigned) operation results in a borrow (is negative), then the borrow bit is set. However, there is no explicit borrow flag - instead the complement of the carry flag is used.
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