Introduction:

NES_DEV is an open source NES emulator for educational and experimental purposes.

I want to port this emulator on a STM32F103ZET6 micro controller, and making a portable and hand held game console, which can run on a low cost ARM device. There is may NES emulators in the world, but none of them runs on low cost micro controllers, most of them runs on PCs. I want to make a simple and easy to build system, which anyone can make and enjoy it.

This emulator only depends on SDL library. You can get it from www.libsdl.org.

NES_DEV running on linux with enabled debug options.

Linux

My STM32F103ZET board. I bought it from ECA.

STM32 board

Super Mario Bros. on ILI9325 TFT color LCD.

Super Mario Bros.

Known issues:

Sprite 0 hit flag not working properly in some conditions. I think that it is because poor implementation of transparent color of palette.
Mapper 4 not working perfectly.
When PPU rendering is disabled, emulator doesn't render any thing (It must render color 0 from palette).
Clipping background and sprites not implemented yet.
Generated .sln file for visual studio by cmake, doesn't understand start up project. After opening project in visual studio, you must right click on NES_DEV project and select it as start up project manually.

Future works:

Better PPU and graphic implementation.
Optimized and fast rendering for ARM devices.
APU and sound implementation.
Adding more mappers.
Adding SD card file system for loading ROM images for ARM devices.
Making a small game for tests.
Adding a better build script for making TEST ROM.
Designing low const, felexible, and extensible PCB for hand-held console.

How to make project:

First get and install cmake build system, and get SDL library and install it.
Make bin directory in project root directory with "mkdir bin" command.
Go to bin directory with "cd bin" command.
Run cmake with "cmake .." command.
Build project with "make" command in linux environments or click on .sln file to open visual studio.

Key map:

Esc -> Quit emulator
Arrow keys -> Directional buttons
Key pad 1 or S key -> A button
Key pad 2 or A key -> B button
Key pad 7 or Enter key -> Start button
Key pad 8 or Right Ctrl key -> Select button
P key -> Toggle sprites
B key -> Toggle background
T key -> Toggle name table window
Y key -> Toggle pattern table window
F1 to F4 keys -> Save game state into slot 1 to slot 4
F5 to F8 keys -> Load game state from slot 1 to slot 4

Tools and utilities:

iNesDPT : ines pattern table dumper.
iNesInfo : Prints ines file information.
iNesMk : ines header file maker.

Unit test:

I used X6502 from FCEUX project, and M6502 from Marat Fayzullin project source codes for my p6502 module testing. My test runs all modules and checks all CPU contexts and RAMs with each other. If there is inconsistency, it fails. I found that there is some bugs in M6502 module.

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