BelOS - an singletasks console operating system for easy building small systems. BelOS supports FAT32 file system, binary 32-bits executable COM files, 32-bits PE EXE and ELF files in future. There is also support for executable files in a bytecode format that can run on embedded systems with event based tasking.
Ported NES emulator from here
To build BelOS copy all files from utils.zip in project folder and run build.bat script.