So far no AI complex enough to write an OS was developed.
All OS's used these days were written by humans.
Basically, any operating system is simply instructions written in code the computer understands.
The Apple iPhone is a separate computer from any other computer line. It runs its own operating system, which is completely separate from Apple's OSX desktop/laptop operating system.
DOS is an operating system type, not a computer. There have been many DOSs that ran on many different computers; from mainframes to minicomputers to microcomputers over the decades.DOS = Disk Operating System and encompasses any operating system for any computer using disks for its main filesystem.
The OS (operating system). Examples of OSs are windows XP and Linux.
Most first generation computers had no operating system. When they did, it was usually just something called a Batch Monitor, all it did was sequence through several jobs one at a time that had been submitted in a batch. The computer companies saw no need for any form of operating system, so the machine's users had to write them all themselves. It was not until the second generation computer that computer companies supplied operating systems for their computers and the earliest of these were simply adaptations of operating systems written by users of first generation computers with a few extensions.
Most first generation computers had no operating system. When they did, it was usually just something called a Batch Monitor, all it did was sequence through several jobs one at a time that had been submitted in a batch. The computer companies saw no need for any form of operating system, so the machine's users had to write them all themselves. It was not until the second generation computer that computer companies supplied operating systems for their computers and the earliest of these were simply adaptations of operating systems written by users of first generation computers with a few extensions.
Any operating system that allows for "paging" or "swapping" is capable of this.
Any computer with the ability to understand "partitions" can run multiple operating systems, albeit one at a time. Any computer with the ability to run virtual hardware (such as with a Hypervisor) can run more than one operating system simultaneously. The operating system must also support partitions or it will be unable to run on a hard drive with more than one partition.
An operating system takes control by effectively managing user input. It also manages both external and internal requests. This can include program and application requests, along with information sent via keystrokes and other protocols. The main function of any operating system is to assist the CPU in facilitating user and program functions.
When you don't have any operating system, the computer won't boot. You can only access BIOS setup or your boot-loader. In simple words, you can't do anything with it.
Any of the operating systems such as macOSX, Linux, and Windows will run on a desktop or notebook computer. The types of operating systems that work on a mobile computing device depend on its type.
To run a program without an operating system is a really difficult task. If one needs to type a document in a word processing program, one will have to create a code that will tell the computer to respond to each character pressed on the keyboard. Then one will have to write a code to tell the computer how responses must translate to the screen.