Dot matrix printers produce hardcopy at high speed with varying degrees of resolution, whereas fully formed character printers produce letter quality copy. RAM memory is the workspace used by the CPU for storing data and programs. It is volatile. ROM memory holds instructions supplied by the manufacturer. ROM is nonvolatile.
Memory is allocated in eight bit quantities called bytes.
One character occupies one byte of memory. Data that must be saved after the computer is turned off are usually stored on a floppy or hard disk, or secondary storage devices magnetically record binary data onto a rotating disk.