CROS - it's a simple OS implementation, which works on APCPU-32 virtual microprocessor. APCPU instruction set - is a part of G4 game https://bitbucket.org/ruifig/g4devkit (WIP)

• User- and kernel- mode for apps
• TLSF memory allocator (from @mattconte fork: https://github.com/mattconte/tlsf)
• Preemptive multitsaking
• Drivers for:
  • Screen
  • Network
  • Keyboard
  • Disk drive (http://elm-chan.org/fsw/ff/00index_e.html)
  • Clock
• uBASIC interpreter (from @EtchedPixels fork: https://github.com/EtchedPixels/ubasic)

• Command shell
  • 'ls' - show files and folders in current directory
  • 'mkdir DIR_NAME' - make new directory
  • 'mkfile FILE_NAME' - make new file
  • 'cd FILE_NAME' - change directory
  • 'rm NAME' - remove file or directory
  • 'cat FILE_NAME' - print file content to console
  • 'edit FILE_NAME' - simple texteditor
  • 'basic FILE_NAME' - uBASIC interpreter
  • 'paint FILE_NAME' - simple picture editor (WIP)
  • 'ps' - list of processes
  • 'profile PID' - show PID HWI/SWI statistics
  • 'diskinfo' - show info about disk drives & FatFS state
  • 'mkfs DRIVE' - make FatFS at selected disk drive
  • 'disasm 0xADDRESS' - disassemble address
• Chat
  • 'chat' - client app
  • 'chat_server' - server app

Current implementation isn't optimized. APCPU VM should be configured with this params to comfortable run:

RamKBytes=4096

TargetedSpeedMhz=32.0

❗ Also, there is main requirement: Disk should be mounted to VM.

You can visit https://github.com/brickbtv/CROS/issues page, to get more info

• Memory leaks: 'free(...)' function gives unexpected asserts in TLSF code after process finish. Currently, most of 'free' functions is commented.
• Clock callbacks works incorrect in some reason
• Process crash is currently crashed the OS (only for debugging. all you need to avoid crashed - update 'assert' macros with sdk_prc_die() function)