Most computers nowadays do not store any portion of the operating system in ROM. Among those that did and still do, only the kernel and basic system libraries are placed in ROM.
ROM
circut board - the read-only memory (ROM)
It is typically burned into a tiny ROM chip on the phone's circuit board.
Ok, it doesn't take Einstein to realise that ROM cannot be updated. So if you want the ability to upgrade an operating system, it can't be on ROM. Also consider disk costs v memory costs. Again, you do not need to be a Nobel Prize winner to figure it out.
ROM ROM is an acronym for Read Only Memory. The advantage of ROM is that its contents do not evaporate when the power is switched off. Therefore the program which needs to execute when the computer is first switched on is stored in a ROM chip on the computer's motherboard. Once the program stored in the ROM chip has finished initialising the hardware, it moves the head of the hard disk to track 0, reads the first sector of track 0 into memory, and then passes control to the short program stored in the first sector of the hard disk. To simplify a bit, it is the responsibility of that program to locate the operating system files on disk, and then begin the process of loading them. hellllllllllllllllllllllllllllo
Usually none. Long ago BIOS(which isn't really part of an OS...) was stored on ROM. These days you've usually got your OS installed on Hard Drive or a SSD drive.
ROM
ROM - the read-only memory
read-only memory
circut board - the read-only memory (ROM)
ROM(read only memory) is the place where the operating system is stored in the computer. == == Ok, it doesn't take Einstein to realise that ROM cannot be updated. So if you want the ability to upgrade an operating system, it can't be on ROM. Also consider disk costs v memory costs. Again, you do not need to be a Nobel Prize winner to figure it out.
It is typically burned into a tiny ROM chip on the phone's circuit board.
BIOS
This is hard to say precisely. However the Minuteman I and II guidance computers stored their software on read only tracks on a harddisk platter, and the Apollo guidance computer stored its software in core rope ROM. But neither of these actually had an operating system, their software ran directly on the hardware with no intermediate layers.
ROM - Read Only Memory, is a non-volatile section of memory which contains the programs which will start running when the computer is first turned on. These ROM programs could contain the entire operating system, or could start the basic input/output functions which load the operating system in from another location, such as stored on a disk.
ROM
The BIOS is stored on ROM.