Currently most common CPUs can handle 16 or 32 bits, hence there are mostly 16 and 32-bit computers available. Speed All CPUs have inbuilt clocks that govern the speed at which information is moved around inside the computer. So 640KB of RAM can hold 640,000 characters and 1Mb of RAM can hold 1,000,000 characters. The memory you require will be determined by your software. The more RAM you have the better, and extra RAM also give you some room for future expansion.
Most personal computers use magnetic disks to store information permanently.
These disks fall into two types, floppy disks and hard disks . Floppy disks or diskettes derive their name from the flexible surface used to store information. The disk can be removed from the disk drive, so stored information can be used on other personal computers. Floppy disks generally store 1.4Mb on 3.5 inch disks. Lower capacity disks tend to be older technology.