The 6502 overflow flag explained mathematically

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The 6502 has a bit instruction which. copies two of the bits into the N and V flags,; pretends to and the byte with the accumulator, but discards the result and only affects Z.; I'm having a hard time picturing a use for this. And curiously, it's missing any indexed or indirect addressing modes, and so can only be used absolutely or in the zero page. The 6502 instruction set includes 8-bit addition and subtraction operations. Various status flags (carry, zero, negative, overflow) are set based on the result of the operation. Most of the flags (carry, zero, negative) are straightforward, but the meaning of the overflow (V) flag is harder to understand. If the result of a The BRK instruction on the MOS 6502 seems to be one of the more ill-documented features of the processor. The 1976 preliminary data sheet from MOS indicates that it's a 1-byte instruction using the "implied" addressing mode (i.e., it has no operands), as does the the 1980 CSG data sheet.¹ (Edit: the MCS6500 Microcomputer Family Programminng Manual does describe the details and intention of ... Cool stuff: [WayBack] MCL65 MicroCore Labs MCL65 6502 core The MC65 is an ultra-small footprint, microsequencer-based, 100% instruction-set compatible, cycle-exact NMOS 6502 core that can be implemented in any FPGA or ASIC technology which can utilize as little as 252 LUTs (0.77%) of a Xilinx Spartan-7 FPGA. It has also been ported to a Xilinx Spartan-3 device where it uses about 10% of the ... As others have commented, there's no add instruction in the 6502 instruction set, nor is there a sub instruction. However I am willing to give you the benefit of the doubt since it's perfectly OK to have a few macros defined in order to avoid having to write clc and sec every time you start a fresh addition or subtraction.

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