Early Computing: Crash Course Computer Science #1

Chapter 1: Introduction

Hello, I’m Carrie Anne and welcome to CrashCourse Computer Science! In this series, we will explore various computing topics, progressing from bits and bytes to operating systems, virtual reality, and robotics. Notably, this series will not cover programming but will focus on computing as both a discipline and a technology.

Computers have become essential to modern life. Their sudden failure would result in chaos: power grids would fall, vehicles would malfunction, and daily activities would come to a halt. Thus, computing is intricately woven into the fabric of our existence, impacting manufacturing and even everyday objects. As seen during the Industrial Revolution, technology introduced remarkable societal changes by enhancing productivity in agriculture, industry, and domestic spheres. Today’s computing advancements echo these historical shifts, correlating with improvements in automated farming, medical technology, telecommunications, and education. We find ourselves in what may be recognized as the Electronic Age.

Despite the complexity and billions of transistors packed into modern devices, at their core, computers function as simple machines executing intricate operations via multiple layers of abstraction. By deconstructing these layers throughout the series, we’ll gradually build our understanding from fundamental binary to advanced computational concepts like CPUs and the internet. This series is designed to be comprehensible and non-linear - an exploration built upon itself without requiring a prior detailed knowledge of previous episodes.

By journey's end, my hope is to enhance your perspective on computing’s role in society and everyday life, fundamentally understanding humanity's monumental invention as still being in its infancy. To begin, we need to look at the origins of computing, noting that the necessity for computation is not a new phenomenon.

Introduction to Early Computing Devices

The earliest recognized computing device was the abacus, invented around 2500 BCE in Mesopotamia.

Chapter 2: Computing Origins

The abacus functions as a hand-operated calculator, enabling addition and subtraction through physical manipulation of beads. With increasing societal complexity, the abacus addressed the limitations of individual human memory when managing large quantities of information, sometimes spanning thousands in a village or vast herds of livestock.

A simple abacus structure typically consists of rows representing ascending powers of ten. For instance, beads on the lower row represent single units, the next row represents tens, and so forth. When performing calculations, users can visually manipulate beads to represent sums. For example, if three beads represent three heads of cattle, and four more are acquired, the user would simply slide additional beads without needing mental computation. This capability allows for managing larger numbers effectively, avoiding mental errors associated with larger arithmetic. Over four millennia, many ingenious computational devices emerged, like the astrolabe for celestial navigation and mechanical clocks for timekeeping. Each innovation streamlined calculations and enhanced human cognitive abilities, illustrating a recurring theme in computing’s evolution.

Interestingly, none of these devices bore the title of “computer.” The term was first documented in 1613, used by Richard Braithwait to describe human calculators, who employed both mental math and mechanical aids. This definition evolved by the late 19th century, transitioning towards devices designed for computation.

Among the significant inventions was Gottfried Leibniz's Step Reckoner, crafted in 1694. Intended to alleviate tedious calculations, it featured a series of gears representing digits and could perform addition, subtraction, multiplication, and division. However, the mechanical nature of such devices limited their accessibility and affordability, leading most computations to rely on pre-calculated tables curated by the early human computers. This slower process underscored computing’s growing importance yet highlighted the limitations of available technology.

Chapter 3: Artillery Range Tables

Speed and accuracy have always held critical value in military operations, highlighting a pivotal application of computing devices. Artillery gunners relied on Range Tables to adjust firing angles based on environmental factors and target distances. However, adapting these tables for new equipment designs was both time-consuming and prone to error. Acknowledging this inefficiency, Charles Babbage addressed similar challenges in his 1822 Royal Astronomical Society paper about using machinery to compute mathematical tables.

Chapter 4: Analytical Engine

Babbage’s ambition led to the conception of the Difference Engine, intended to compute polynomial functions. Though it was never completed during Babbage’s lifetime, its conceptual evolution birthed the Analytical Engine, which offered capabilities of a general-purpose computer. It had memory, an operational sequence, and even a primitive printing function.

The Analytical Engine represented a radical shift in computational devices, capable of versatility across tasks. Ada Lovelace, often heralded as the first programmer, wrote potential programs for it, recognizing a new language of analytical computation. Despite its non-creation during its time, Babbage’s Analytical Engine laid fundamental groundwork for modern computers, earning him his title as the "father of computing."

Chapter 5: Tabulating Machine

By the late 19th century, while computing devices catered primarily to scientific endeavors, the U.S. government faced a pressing need for efficient census reporting. The 1880 census process, taking seven years for manual compilation, foreshadowed inevitable delays for the upcoming 1890 census. Herman Hollerith’s electro-mechanical tabulating machine utilized punch cards to streamline data collection and processing. This advanced solution vastly reduced census completion time to two and a half years and showcased computing's utility for business applications, leading to innovations in data-heavy sectors.

Hollerith recognized this potential and founded the Tabulating Machine Company, which would later evolve into IBM. The rise of electro-mechanical devices transformed commerce and governance, setting the stage for the digital computer era on the horizon.