CS140 Lecture 09a: Brief History of Computing
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1 CS140 Lecture 09a: Brief History of Computing "There is no reason anyone would want a computer in their home." -- Ken Olson, founder and CEO of Digital Equipment Corp., 1977 John Magee 17 February 2017 Some images courtesy Wikimedia Commons, IBM, DEC 1
2 Overview/Questions Where did computers come from? When were computers first discovered? Why should you care about the history of computing? 2
3 Early History of Computing Abacus (2400 BC) Ancient device to record numeric values Above: a reconstructed Roman abacus 3
4 Early History of Computing Blaise Pascal ( ) Mechanical device to add, subtract, divide & multiply 4
5 Early History of Computing Joseph Jacquard (1801) Jacquard s Loom, the punched card 5
6 Programmability What tricks does your computer do? Web browsing, , instant messenger Play games Watch movies, organize photos Word processing, spreadsheets, database Programmability is the ability to give a generalpurpose computer instructions so that it can perform new tasks. 6 3
7 Difference Engine Charles Babages mechanical calculating machine, designed in 1820s. Ada Lovelace: First Algorithm 7
8 Finite State Machines AKA Finite State Automata Think about a Traffic light operation There are only a limited number of states configurations of lights. Each state transitions into a new state. E.g. Green Yellow Red 8
9 Turing Machines Alan Turing Considered to be the father of Computer Science Also known for the Turing Test for Artificial Intelligence Turing Machine A turing machine is an abstract thought experiment. Mathematical proof of computability of algorithm. Basis for Computer Science Theory. 9
10 Early Digital Computers Harvard Mark I (1944) 10
11 Harvard Mark I IBM Archives 11
12 Early Digital Computers Harvard Mark I (1944) First fully automatic digital computer to be completed 51 feet wide, 8 feet high, 2 feet deep Built out of switches, relays, and rotating mechanical shafts/clutches Storage for 72 numbers, each 23 decimal digits in length Read instructions from paper tape, one at a time 12
13 Early Digital Computers ENIAC (1946) Electronic Numerical Integrator And Computer first general-purpose electronic computer 80 feet wide, 8.5 feet high, 3 feet deep No moving parts Ability to conditional branch do the next operation based on the result of the previous operation. 17,468 vacuum tubes, 7,200 crystal diodes, 1,500 relays, 70,000 resistors, 10,000 capacitors and around 5 million hand-soldered joints. 5,000 Hz, 324 multiplications/second 13
14 ENIAC 14
15 First Computer Bug Log of first computer bug, discovered by Grace Hopper, 1945 A Computer Science Pioneer, she later wrote the first Compiler. 15
16 Computer Programming, 0.X The earliest digital computers were programmed by wiring them up to perform some specific logic. Pictured: Harvard Mark I 16
17 Computer Programming, 0.X Later, instructions were programmed by flipping switches. Pictured: Digital Equipment PDP-8 Demo: 17
18 Stored Program Computer John von Neumann (a mathematician who worked on the atomic bomb) Described a computer architecture in which instructions are read from the memory space (RAM), just like data. This design enables programmability, by making it relatively easy to provide new instructions to the computer s hardware. 18
19 Stored Program Computer (Von Neumann Architecture) Figure 5.1 The von Neumann architecture 19
20 Architecture Harvard Architecture: Instructions separate from data. Von Neumann Architecture: Instructions = data. All stored in the same memory. A program can write a program! (Compilers) All modern computers based on this. 20
21 Stored Program Computer Data and instructions to manipulate the data are logically the same (binary code) and can be stored in the same place (RAM). The machine language of a particular computer is the set of binary coded instructions built into its hardware. 21
22 Machine Language Characteristics of machine language: Every processor type has its own set of specific machine instructions. The relationship between the processor type and the instructions it can carry out is completely integrated. Each machine-language instruction does only one very low-level task. 22
23 Mainframes IBM 704 (1954) First floating point hardware mass produced Univac 1108 (1964) 23
24 1960 s-1970 s Interactive sessions Multi-user systems Time-sharing Terminals mini computers DEC PDP-7 24
25 Grace Hopper 1944: One of the first programmers of Harvard Mark I. 1949: Suggested programming with English words. 1952: First compiler: Nobody believed that," she said. "I had a running compiler and nobody would touch it. They told me computers could only do arithmetic : COBOL programming language. 1986: Retired as oldest active-duty commissioned officer in the US navy. 25
26 Grace Hopper 1989: Honorary Degree at Clark University. 2016: Presidential Medal of Freedom 2017: Yale announced plan to rename one of its undergraduate colleges Grace Murray Hopper College. Annual Convention: The Grace Hopper Celebration of Women in Computing 26
27 Margaret Hamilton Lead Apollo flight software designer. Hamilton has published over 130 papers, proceedings, and reports about the 60 projects and six major programs in which she has been involved. Legitimized the use of the term "software engineering as a disciplined approach to science and engineering of software. CEO of two software companies she founded Presidential Medal of Freedom 27
28 Rise of the PC Video: Triumph of the Nerds PBS Series hosted by Bob Cringely 9:24 - Cringely explains digital computing, program, 10:00 - data, instructions in binary, flipping switches, etc. Grace Hopper, programming COBOL, mainframe computers, punch cards, Wozniak, Jobs on programming, 12:58 - microprocessor (vacuum tubes, transistors, chips ), Intel 15:30 - Altair :20 - Homebrew computer club 20:30 - computer club, binary addition by flipping switches 22:30 - programming language/basic interpreter, Paul Allen, Bill Gates // 27:00 28
29 Rise of the PC Video: Triumph of the Nerds PBS Series hosted by Bob Cringely 27:00 - Microsoft in Albuquerque, basic for the Altair 29:12 - Steve Jobs, Jim Warren, sixties counter culture 31:30 - Apple Computer, Apple I, II // 35:00 35:00 - venture capital for apple, apple II, manufacture 37:10 - computer fair 40:00 - Intro VisiCalc on an Apple II 44:38 - wall street use of PC 46:15 - wrap up characters 48:50 - closing remarks 29
30 Rise of the PC ( ) What happened next? IBM PC and Microsoft Disk Operating System (DOS) Apple, Amiga, Tandy, Atari, IBM IBM Clones / PC Compatibles the Internet to be continued What is a killer app? What s next? 30
31 What happened to women in CS? Right: Elsie Shutt founded one of the first software businesses in the U.S. in And the programmers were all women. NPR: When Women Stopped Coding And these toys were marketed almost entirely to men and boys. 31
32 Moore s Law 32
33 Early Personal Computers Computer Ads: Atari 400 (1980) Commodore VIC-20 (1981) Compaq portable computer 33
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