I.1 Introduction to Information Technology and Computers

⬆️ Back to: P-I.I. Introduction to Computing

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Page Outline — click a heading to jump. Past-paper questions sit in the last section.

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Exam pattern (2016–2026): Not asked on its own. Feeds 2024 Q2(a) (future of IT in Pakistan) and basic-term MCQs.

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1. Information Technology (IT) — Definition

• IT: the use of computer systems to manage, process, protect and exchange information.
• Covers more than computers:
  • communication networks
  • computer literacy (knowing how to use the technology)
• Core tasks in every field: gathering, allocating, controlling and retrieving information.
• Example: Electronic Health Records (EHR) and Hospital Information Technology (HIT) show IT reaching beyond pure computing.

2. Computer Literacy

• Uses the computer in own field: to work faster and easier.
• Knows the terminology: hardware, software, memory, storage, network.
• Understands broadly: what a computer is, what it can and cannot do.
• Uses the Internet and Web: and critically judges what is found there.
  • This last point is the one candidates forget.

3. Definition of a Computer

• Computer: an electronic device that
  1. accepts data (raw facts) as input
  2. processes that data
  3. produces useful information as output
• Program: a set of step-by-step instructions the computer follows to do a task.
• Memory: holds program, data and results temporarily during processing.
• Secondary storage: keeps them permanently after processing.
• Key characteristics: accurate, fast, reliable.

4. Data vs Information

• 🧠 Formula: data + processing = information.
• Pakistan example: NADRA's raw CNIC records are data; voter rolls and population figures drawn from them are information.
• DIKW ladder (extra mark): Data → Information → Knowledge → Wisdom.

5. How the Meaning of "Computer" Changed

• Before 1935: "computer" meant a person who did long calculations by hand.
  • Teams of human computers made navigation, artillery and census tables (NACA, Nautical Almanac Office).
• 1935–1945: meaning shifted to a machine.
  • Driven by Zuse's Z1/Z3 (1936–41), Atanasoff-Berry Computer (1939–42), Colossus (1943–44), Harvard Mark I (1944).
• Modern (von Neumann) definition: a device that accepts input, processes, stores and outputs data under a stored program.

6. Von Neumann Stored-Program Concept

• Source: First Draft of a Report on the EDVAC, John von Neumann, 1945.
• Key idea: program and data sit in the same memory.
  • A machine is reprogrammed by loading new instructions, not by rewiring.
• Five parts:
  • Control Unit
  • Arithmetic Logic Unit (with CU forms the CPU)
  • Memory
  • Input devices
  • Output devices
  • All linked by a bus.
• Contrast: ENIAC (1946) had no stored program; reprogramming meant re-plugging cables and some 6,000 switches.
• Von Neumann bottleneck: one shared bus limits CPU speed.
  • Fixes: cache memory, Harvard-style separate paths (see I.5).

7. Hardware Evolution (as in the text)

• Chain: Vacuum tube → Transistor → Microchip → Modem → digital exchange of text, sound, photo and video.
• Vacuum tube (1st gen, 1940s–50s):
  • Glass switch/amplifier.
  • Example: ENIAC used thousands.
  • Drawback: huge power use, heat, frequent burn-outs.
• Transistor (2nd gen, late 1950s–60s):
  • Small semiconductor switch.
  • Smaller, faster, cheaper, more reliable, less power.
• Microchip / IC (3rd gen, 1960s–70s):
  • Many transistors on one silicon chip.
  • Led to the microprocessor (4th gen): whole CPU on one chip, e.g. Intel 4004 (1971).
• Modem:
  • MOdulates/DEModulates signals over phone or cable lines.
  • Let home PCs join remote networks (1990s dial-up).

8. Early Calculating Device — Abacus

• What it is: beads or counters slid on rods; each rod is a place value.
• Does: addition, subtraction, multiplication, division.
• Not a computer: no stored program; the human supplies every step.
• Date in the text: 14th century.
  • Origin in history: Mesopotamia/Babylon, about 2400 BC.
  • Later forms: Chinese suanpan, Japanese soroban.
• Later milestones (Pascal, Babbage, Hollerith) are on I.2 History of Computing.

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9. ⚠️ MCQ Traps

• Data ≠ information: raw vs processed.
• Pre-1935 "computer" = a person: a favourite trivia MCQ.
• Computer literacy includes judging information, not only technical skill.
• Abacus origin: if asked for civilisation, answer Mesopotamia/Babylon.

10. ✅ Self-Test Questions (with Answers)

Q1. Give the modern, von Neumann–based definition of a computer.

• Definition: an electronic device that accepts input, processes data under a stored program, stores data and produces output.
• Framing: input → process → store → output.
• Basis: von Neumann's 1945 stored-program concept — program and data share one memory.
• Exam tip: write the phrase "stored-program concept", then expand.

Q2. Distinguish data from information with one example.

• Data: raw facts with no meaning alone.
• Information: processed data that supports a decision.
• Example: 72, 65, 88, 54, 91 → "class average 74%".
• Add the comparison table from section 4.

Q3. What did "computer" mean before 1935, and how did that change by 1945?

• Before 1935: a person doing hand calculations.
• 1935–45: electronic machines arrived (Z3, ABC, Colossus, Harvard Mark I).
• By 1945: "computer" meant an automatic electronic machine; "human computer" became a retronym.

Q4. List the four components of computer literacy.

• Use the computer in one's own field.
• Know computing terminology.
• Understand broadly what a computer can and cannot do.
• Use the Internet and critically judge online information.
• CSS angle: Digital Pakistan Policy and PTA anti-misinformation drives target this fourth skill.

Q5. What was the abacus used for, and in what century does the text place it?

• Use: manual arithmetic by sliding beads.
• Century in the text: 14th.
• Status: earliest known calculating tool, not a computer.