Computer Generations • How many generations of computer? • What are these First Generation 1946-1959. Vacuum tube based Harvard Mark I - The first modern digital computer (1942) Second Generation 1954-1965. Using transistor The SAGE Computer Network (about 1954) Third Generation 1965-1971. use of Integrated Circuits (IC's) Apollo Guidance Computer (1968) Forth Generation 1971-1980. Very Large use of Integrated Circuits (IC's) Apple I (1976) Fifth Generation 1980-till date. Ultra Large Scale Integration The Apple Macintosh (1984) Dynacam - the first digital camera (1990) • The first consumer digital camera. Saved a 320 x 240 pixel image, interfaced to an Apple Macintosh Computer Hardware Computer Hardware Central Processing Unit (CPU) Brain of Computer IT Process all input data and provides output to hardware CPU speed measured in Gigahertz (GHz) 1 Gigahertz (GHz) = 1000,000,000 cycles per second More higher CPU speed is more higher performance Computer Hardware Motherboard Computer Hardware RAM (Random Access Memory) Computer Hardware Hard Disk Drive (HDD) Operating System (OS) 1975–1981: Microsoft boots up-History of Windows OS What is the First Window of Microsoft? 1985: Introducing Windows 1.0 1990-Windows 3 1995: Windows 95—the PC comes of age (and don't forget the Internet) 1998: Windows 98 1999: Windows Me 2000: Windows 2000 Professional 2001–2005: Windows XP—Stable, usable, and fast 2006–2008: Windows Vista—Smart on security 2009: Windows 7 introduces Windows Touch 2012: Windows 8 features apps and tiles 2013: Windows 8.1 expands the Windows 8 vision Computer Memory Measurement Bit 0 or 1 the Smallest Unit 8 Bits 1 Byte 1024 Bytes 1 Kilobyte (K.B) 1024 Kilobyte (K.B) 1 Megabyte 1024 Mega Byte 1 Gigabyte 1024 Gigabyte 1 Terabyte 1024 Terabyte 1 Exabyte Yahoo Old Days What’s Next? Flexible Mobiles Transparent Google Glasses Google Facebook Drone