Read Only Memory has a certain instruction set used internally to direct system operations. It does not know how to operate disk drives by itself. ROM is built into the computer. The Disk Operating System must be loaded before other programs can be used. If a disk does not contain DOS instructions, a disk with DOS on it must be booted first.
Computers have keys similar to a typewriter.
They also have a number of keys that are different and have special functions beyond typing. May also be used in combination with other function keys. Some keyboards contain additional control keys. The directions are up, down, left and right. C. Diskettes 1.