computer

Further topics
Hardware
Main article: Personal computer hardware
The term hardware covers all of those parts of a computer that are tangible objects. Circuits, displays, power supplies, cables, keyboards, printers and mice are all hardware.
History of computing hardware
First Generation (Mechanical/Electromechanical)
Calculators
Antikythera mechanism, Difference engine, Norden bombsight
Programmable Devices
Jacquard loom, Analytical engine, Harvard Mark I, Z3
Second Generation (Vacuum Tubes)
Calculators
Atanasoff–Berry Computer, IBM 604, UNIVAC 60, UNIVAC 120
Programmable Devices
Colossus, ENIAC, Manchester Small-Scale Experimental Machine, EDSAC, Manchester Mark 1, Ferranti Pegasus, Ferranti Mercury, CSIRAC, EDVAC, UNIVAC I, IBM 701, IBM 702, IBM 650, Z22
Third Generation (Discrete transistors and SSI, MSI, LSI Integrated circuits)
Mainframes
IBM 7090, IBM 7080, IBM System/360, BUNCH
Minicomputer
PDP-8, PDP-11, IBM System/32, IBM System/36
Fourth Generation (VLSI integrated circuits)
Minicomputer
VAX, IBM System i
4-bit microcomputer
Intel 4004, Intel 4040
8-bit microcomputer
Intel 8008, Intel 8080, Motorola 6800, Motorola 6809, MOS Technology 6502, Zilog Z80
16-bit microcomputer
Intel 8088, Zilog Z8000, WDC 65816/65802
32-bit microcomputer
Intel 80386, Pentium, Motorola 68000, ARM architecture
64-bit microcomputer[34]
Alpha, MIPS, PA-RISC, PowerPC, SPARC, x86-64
Embedded computer
Intel 8048, Intel 8051
Personal computer
Desktop computer, Home computer, Laptop computer, Personal digital assistant (PDA), Portable computer, Tablet PC, Wearable computer
Theoretical/experimental
Quantum computer, Chemical computer, DNA computing, Optical computer, Spintronics based computer
Other Hardware Topics
Peripheral device (Input/output)
Input
Mouse, Keyboard, Joystick, Image scanner, Webcam, Graphics tablet, Microphone
Output
Monitor, Printer, Loudspeaker
Both
Floppy disk drive, Hard disk drive, Optical disc drive, Teleprinter
Computer busses
Short range
RS-232, SCSI, PCI, USB
Long range (Computer networking)
Ethernet, ATM, FDDI