MOS6502 cpu emulator

Hi !
There is again another emulator of mos6502 !

First of all, include the file "cpu.hpp" in your source files.

Now, you can create an object of type mos6502::Cpu

Here the list of public functions :

    void run();
    void load(std::vector<uint8_t> &instr, uint16_t addr);
    void set_NMI_VECTOR(uint16_t value);
    void set_IRQ_VECTOR(uint16_t value);
    void set_RESET_VECTOR(uint16_t value);
    bool is_BRK();
    void IRQ();
    void NMI();
    void RESET();

the functions set_NMI_VECTOR, set_IRQ_VECTOR and set_RESET_VECTOR allows to put a value of the memory range for each interruption (the value of PC register after interruption).
the functions IRQ, NMI and RESET cause choosen interruption.

the function is_BRK returns true if the current opcode is the BRK instruction, else false.
the function load allows you to put a binary value vector in the memory at the given address.
the function run execute the opcode.

example :

    std::vector<uint8_t> bin {0xA2, 0x0A, 0x8E, 0x00, 0x00, 0xA2, 0x03, 0x8E, 0x01, 0x00, 0xAC, 0x00, 0x00, 0xA9, 0x00, 0x18, 0x6D, 0x01, 0x00, 0x88, 0xD0, 0xFA, 0x8D, 0x02, 0x00, 0xEA, 0xEA, 0xEA};
    mos6502::Cpu cpu{};

    cpu.set_RESET_VECTOR(0x8000);
    cpu.load(bin, 0x8000);

    while (true) {
        cpu.run();

        if (cpu.is_BRK())
            break;
    }

In the file CMakeLists.txt, there is 3 lines in comment.

#add_compile_definitions(DEBUG_INFO)
#add_executable(<name> srcs)
#target_link_libraries(<name> mos6502_cpu)

• the first line allows you to print the value of each register at each loop of the run function of the cpu.
• the second line allows you to create your executable, replace the name by the name of your executable and replace srcs by all your source files.
• the third line links the library (object file of the cpu) to your project. So replace name by the name of your executable name.

now you can follow these lines :

mkdir build
cd build
cmake ..
make

now you have your executable and the library.

Enjoy !