Overview

A simple NES emulator written in C++ (or rather, C with some C++ features sprinkled on).

Features

• Cycle-accurate CPU emulation, including dummy reads and double writes
• Supported INES mappers: 000 (NROM), 001 (MMC1), 002 (UxROM), 003 (CNROM), 004 (MMC3)

Building

CMake is required to generate the build files for the project. To generate the build files, type the following:

mkdir build
cd build
cmake ..

After the build files have been generated, build the project using the platform compiler toolkit (e.g. Visual Studio on Windows).

Screenshots

Tests

CPU Tests

Pass	Test	Author	Description
✔️	branch_timing_tests	blargg	Timing of the branch instruction, including edge cases
✔️	cpu_dummy_reads	blargg	Test addressing modes that have dummy reads
✔️	cpu_dummy_writes	bisqwit	Verify double writes by read-modify-write instructions
✔️	cpu_exec_space	bisqwit	Verify that CPU can execute code from any memory location
❌	cpu_interrupts_v2	blargg	Behavior and timing of CPU interrupts (NMI and IRQ)
✔️	cpu_timing_test6	blargg	Instruction timing (official and unofficial)
✔️	instr_misc	blargg	Miscellaneous instruction test
✔️	instr_timing	blargg	Instruction timing (official and unofficial)
✔️	nestest	kevtris	Instruction behavior (official and unofficial)

PPU Tests

Pass	Test	Author	Description
✔️	oam_read	blargg	Reading from OAMDATA returns data at OAMADDR
✔️	oam_stress	blargg	Thoroughly test OAMDATA and OAMADDR
✔️	ppu_open_bus	blargg	Test PPU open bus behavior
✔️	ppu_read_buffer	bisqwit	PPU test suite mostly concentrating on the PPU read buffer
❌	ppu_vbl_nmi	blargg	Test PPU VBL flag behavior and timing
❌	scanline	Quietust	Test PPU scanline timing accuracy
✔️	sprite_hit_tests_2005.10.05	blargg	Sprite 0 hit behavior and timing
❌	sprite_overflow_tests	blargg	Test sprite overflow behavior and timing