Nes-Emulator

Nintendo Entertainment System Emulator

Goals

The final goal is creating an emulator that can support c++ plugins to control and play real NES games. The purpose is that AI developers can plugin AI agents to train and play real NES games.

Design

5 main objects:

• The Console
• The Central Processing Unit (CPU)
• The Picture Processing Unit (PPU)
• The Cartridge
• The Controller

The CPU

• Emulate the control of the 6502 CPU used in the NES.
• Implement the complete instruction set.
  • Addressing modes
  • Instruction cycles

Attributes

• An array 8-bit integers represent the memory of the CPU.
• 16-bit Program Counter (PC)
• 8-bit Stack Pointer (SP)
• 8-bit Accumulator
• 2 8-bit index-registers (X and Y, where X is the one that can do stack operations)
• 8-bit processor status (P)

Methods

• step(): executing the next instruction, updating all registers and memory accordingly

• helper methods:

  • execute(instruction, address_mode) : executing a specific instruction (This method is currently use mainly for testing)