A Computer is a general purpose device that can be programmed to carry out a set of arithmetic or logical operations automatically. Since a sequence of operations can be readily changed, the computer can solve more than one kind of problem.
Computer Speed, Accuracy, Diligence, Storage Capability, Automation, Remembrance Power and Versatility are the main Characteristics of Computer.
Self Intelligence, Decision-Making power, Learning power, Self care, Fallings are the Limitations of Computer.
A mainframe computer is a much larger computer that typically fills a room and may cost many hundreds or thousands of times as much as a personal computer. They are designed to perform large numbers of calculations for governments and large enterprises.
Read-only memory (ROM) is a storage medium used in computers and other electronic devices. Data stored in ROM can only be modified slowly or with difficulty, or not at all.
ROM is non-volatile and the contents are retained even after the power is switched off.
It only allows reading.
The types of ROM include PROM, EPROM and EEPROM.
Random Access Memory (RAM) allows the computer to store data for immediate for immediate manipulation and to keep track of what is currently being processed.
RAM is referred to as volatile memory and is lost when the power is turned off.
It allows reading and writing.
The two main types of RAM are static RAM and dynamic RAM.
SRAM retains data as long as power is provided to the memory chip and need not be refreshed periodically. SRAM stands for Static Random Access Memory.
The data on DRAM continues to move in and out of the memory as long as power is available and must be continually refreshed to maintain the data. DRAM stands for Dynamic Random Access Memory.
Primary memory is computer memory that a processor or computer accesses first or directly.
For example: RAM, and Cache Memory.
Secondary memory (or secondary storage) is the slowest and cheapest form of memory. It cannot be processed directly by the CPU.
Secondary memory devices include magnetic disks like hard drives and floppy disks, optical disks such as CDs and CDROMs, and magnetic tapes, which were the first forms of secondary memory.
Virtual memory is memory on the hard disk that the CPU uses as an extended RAM.
Installation is the process of copying software programs from secondary storage media to the hard disk.
A central computer that holds collections of data and programs for many PCs, workstations and other computers is a Server.