PiscisOS is a tiny multi-task operating system based x86 architecture, run in protect mode

Project site: https://tishion.github.io/PiscisOS

Source: https://github.com/tishion/PiscisOS


I wrote this project with FASM in 2012. Here are the features of this tiny toy OS

Run in x86 protect model
Multi-task supported (Maximum 250 processes)
Ram Disk file system (FAT12)
System calls
Application supported



PiscisOS boot stage screenshot (In Vmvare)





PiscisOS Shell screenshot (in Vmware)



(In Bochs)

Very nice.

Seven year old OS.

Have you tried it on real hardware?

Can it boot from HDD/SSD? I don't have any floppy drives now.

Hi revolution,

Sorry to tell you currently Piscisos doesn't support booting from other media except floppy. If you need to boot it from HDD/SSD you have to modify the boot sector. The boot sector needs to load the OS kernel into the memory. And currently PiscisOS only supports the In-Memory-FAT12 file system.

PiscisOS is just a very simple demo OS as a practice of implementing x86 protect mode.