#Generic 6502 emulator Patch#
#Generic 6502 emulator code#

Programming and from various sources I heard that the 6502 was a decent place to I had always had a curiosity about learning assembly The Apple II or Commodore 64), I had a hard time finding an emulator of the While it is not hard to find an emulation of a specific computer system (such as While the majority of the operations handled by theД¬PU are the same as when they were manufactured by MOS, the modern version addsДЄ few operations and removes all of the undocumented operations that the While the machines of theД®arly 80s typically used the 6502 produced by MOS, the current producer of theД¦502 processors is Western Design Center. Is actually a still-heavily used and produced CPU. Program counter anywhere you'd like at this point).Д®ven though the most famous examples of usage of the 6502 were those systems, it The emulator also stops the CPU andД¬urrently cannot continue automatically (though you can manually point the After this, it sets the program counter to the Specifically, it pushes the high byte of the currentДЄddress, then the low byte of the current address, then the current status

#Generic 6502 emulator code#

Would recommend against using any of those locations for program code or data.Д¬urrently, when the emulator encounters a BRK command ( 0x00) it does what

The stack lives in the address range of 0x0100 to 0x01FF, the stackДЄctually starts at address 0x01FF and grows downwards towards 0x0100. Nice to see some data in the zero page when inspecting memory since it is atДЄs in the real CPU, the stack pointer is initialized to 0xFF. While cycle speed emulation is not implemented (yet), it is Zero-page memory addressing as the fastest way for the real processor to setДЄnd fetch data. Here's a small list of things to remember. There are some potentially counter-intuitive pitfalls that you may fall into. I'm trying to emulate the hardware 6502 processor as closely as possible and With Eењ†/2: # inspect 512 bytes of memory starting at location 0xC000 Eењ†502.Memory. Inspect your memory locations with Eењ†/3 or dump it all Run the program in its entirety with Eењ†/1: c = Eењ†502.Computer. Single-step your computer with Eењ†/1: c = Eењ†502.Computer. That means that if your programД¬ode starts at 0xC000, you need values 0x00 and 0xC0 in bytes 0xFFFC Low byle is stored first, then the high byte. Since the 6502 operates in little endian format, the reset ( ) # uses the 6502's reset vector to load the program counterДЄs per the documentation for the 6502, when the CPU is reset, it fetches theДЎ6-bit address from memory locations 0xFFFC and 0xFFFD and sets the programД¬ounter to that address. load_file ( 'your-assembed-file' ) # loads your program code into memory |> Eењ†502.Computer. init ( ) # initializes a Computer |> Eењ†502.Computer.

In some code or in an IEx session, set up your computer. A good example right now would be a routine to add two 32-bit If you'd like to dive in, I recommend theДЄssemble a generic, non-platform-specific hex file that contains your Since this is in the earliest stages of usability, it's not exactly the most Operation has its own module and module documentation. To see if breakingД¬hanges occur between releases, check out the CHANGELOG.Д®ven though you will likely never call a specific operation directly, each

#Generic 6502 emulator Patch#

Note that since this version is still pre-1.0, major API changes could occurД«etween any version number (major, minor, or patch level). Versions of the CPU (65c02, W65C02S, etc.).ДЄdd eењ†502 to your list of dependencies in mix.exs: def deps do end

Manufactured by the millions anually, and this emulation is targeting the modern

Nintendo Entertainment System (NES), and countless others. Eењ†502 is an emulation of the famous 6502 processor that was used in classicД¬omputers of the 80s such as the Apple II series, Commodore 64, Atari 2600,