Flashcards on Codes, Circuits, and Digital Foundations
Codes, Circuits, and Digital Foundations: An Essential Student Guide
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History of Computing
50 cards
Card 1
Question: What programming innovation did Babbage's Analytical Engine use, and where did the idea for punched cards come from?
Answer: It was programmed using cards adapted from those used in the Jacquard loom; Ada Byron noted that the Analytical Engine 'weaves algebraic patterns' jus
Card 2
Question: What flow control concept did Babbage understand, and how did Ada Byron describe it?
Answer: He understood the importance of conditional jumps and loops (repetition of operations), including nested loops, meaning nested repetitive structures.
Card 3
Question: What invention by Georg and Edvard Scheutz is related to Babbage, and what happened to Babbage's engines afterward?
Answer: They built a difference engine in 1853; Babbage's machines were forgotten until the 1930s when they were rediscovered due to historical interest.
Card 4
Question: What census problem led to the search for automation, and who developed the solution?
Answer: The slow processing of the 1880 census (which took ~7 years) raised concerns that the 1890 census would take even longer; Herman Hollerith developed p
Card 5
Question: What were Hollerith's cards like in terms of size and position layout?
Answer: They were manila cards, 6 1/8 × 3 1/4 inches, with 24 columns of 12 positions each, totaling 288 positions.
Card 6
Question: Why weren't Hollerith's cards used as simple binary bits?
Answer: Because human coders couldn't easily convert data (like age) to binary; furthermore, a fully binary system could physically weaken the cards if almost
Card 7
Question: How did Hollerith encode age on the cards, and how many positions did he use?
Answer: He used two punches: one for the five-year range and another in one of five positions for the exact age within that range; in total, 28 positions were
Card 8
Question: How did Hollerith's tabulating machine work to count data?
Answer: An operator pressed a board with 288 pins; pins that passed through holes touched a mercury bath, closing a circuit, activating an electromagnet, and
Card 9
Question: What additional function did electromagnets serve in Hollerith's machines besides tabulating?
Answer: They were used in a sorting machine that opened trapdoors to one of 26 compartments to sort cards by categories (e.g., occupation).
Card 10
Question: What was the impact of using Hollerith's machines on the 1890 census?
Answer: They processed over 62 million cards with twice the data of 1880 and reduced processing time to about one-third.