SymbOS is an 8 bit multitasking OS for Z80 CPU. It is available for Amstrad CPC and MSX series of computers. It can also be used with emulators. Here are instructions on how to set it up to run under WinApe Amstrad CPC emulator.
Start WinApe. Go to Setting -> Memory and load SymbOS roms as shown below.
Select Settings -> Reset. When emulator reboots, you should see SymbOS rom loaded. Start SymbOS by typing |sym or |symbos (to find where Amstrad | key is on PC keyboard, go to Settings -> Input).
SymbOS will now start up. Enjoy.