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Computer Systems: 121 short revision clips (page 2)

One idea per clip, with the answer written out underneath. Each clip links back to the full Computer Systems lesson it came from.

Steps: signal arrives, CPU saves task, handler runs, task resumes.Give a hardware interrupt example.42 secDesktop diagram labelling icon, taskbar, Start menu and notification area.What does a shortcut icon hold?43 secTable of file tasks: new folder, rename F2, move Ctrl+X and Ctrl+V, delete key.Which key renames a file?46 secSlide: Control Panel classic options, Settings app newer, display network accounts.Where do you change the time zone?42 secSlide: official store or website, untick extra offers, remove with Uninstall.Why avoid cracked software?43 secSwitches inside a chip shown as off equals 0 and on equals 1.What does 1 mean inside a chip?40 secTable of place values for base 2, 8, 10 and 16.What is the rightmost place value in any base?44 secRepeated division of 13 by 2 with remainders read bottom up as 1101.What is 13 in binary?40 secExamples of hex: colour #FF9933, a MAC address and error code 0x80070005.What colour code system is #FF9933?40 secTable of binary addition rules with sum and carry.Where do you start adding binary numbers?40 secCard showing 8 bits hold 0 to 255, 300 needs a ninth bit, overflow error.What is the largest number 8 bits can hold?40 secSteps making -5: 0000 0101, flipped to 1111 1010, plus 1 gives 1111 1011.What are the two steps after writing the positive number?43 secBits of 22 shifted left to 44 and right to 11.What does a left shift by 1 do?40 secFlow: character to number code to binary, using the same code table.Can a computer store the shape of A?41 secASCII facts: 7 bits, 128 characters, A is 65, a is 97, no Indian scripts.How many characters does ASCII have?47 secISCII facts: Indian Script Code, 8 bits, lower half is ASCII, many Indian scripts.How many bits does ISCII use?44 secTable comparing UTF-8 and UTF-32 byte sizes for A and the Hindi letter ka.How many bytes does A take in UTF-32?47 secTable defining pixel, resolution and colour depth.How many colours do 8 bits give?43 secTable defining sample, sampling rate and sample resolution.What is sampling rate measured in?42 secFormulas for image and sound file size in bits.What do you divide bits by to get bytes?40 secThree reasons file size matters: storage, sending time, mobile data.Name one reason file size matters.40 secThree benefits of compression: less storage, faster sending, less mobile data.What does compression do to a file?39 secExamples of run length encoding: WWWWWWBBB to 6W 3B and AAAAAAAA to 8A.What does RLE store for each run?43 secTable of lossy formats: JPEG for images, MP3 and AAC for audio, MP4 for video.Can lossy removed data be brought back?42 secTable matching apps and text to lossless, photos and songs to lossy.Can you use lossy compression for an app?42 secTable matching AND to switches in series, OR to parallel and NOT to one button.When does an AND gate give 1?44 secTruth table for Q equals A AND NOT B with a helper column.How many rows for two inputs?42 secSteps to draw the circuit for (A AND B) OR NOT C.Which part do you draw first?41 secCircuit of NOT, OR and AND gates read as Q equals NOT A AND (B OR C).Why keep the brackets?42 secTable of NAND and NOR with their output rules.When does NAND give 0?41 secTruth table comparing XOR and XNOR outputs.What is 1 XOR 1?45 secTable: NOT uses 1 NAND, AND uses 2, OR uses 3.How do you make NOT from NAND?40 secTruth table rows for (A NAND B) XOR C with a helper column.What do you fill first?40 secTable of Boolean operators NOT, AND and OR with examples.What values can a Boolean variable hold?43 secTable of Boolean laws: identity, idempotence, distributive and absorption.What is A + A.B?46 secDe Morgan's theorems: (A+B)' equals A'.B' and (A.B)' equals A'+B'.What is (A.B)'?38 secThree-step simplification of A.B + A.B' to A with the law named each step.What is B + B'?39 secRow A equals 0, B equals 1 with minterm A'.B and maxterm A+B'.In a minterm, which input gets a bar?40 secTable showing SOP as Σ(1,2) and POS as Π(0,3) for the same function.Which rows does POS use?42 secTable of K-map sizes for 2, 3 and 4 variables.Why does 11 come before 10?41 secFour variable K-map with a centre quad and a corner quad circled.Why do the four corners form a group?40 secHalf adder truth table with sum and carry columns.Which gate gives the sum?45 secSteps: two half adders and an OR gate forming a full adder.How many bits does a full adder take in?43 secTable of number of 1s against sum and carry out.What are sum and carry for three 1s?43 secTable comparing encoder, decoder and multiplexer inputs and outputs.Which circuit is the opposite of an encoder?43 secTable of three sentences marked as proposition or not.Is a question a proposition?40 secTruth table for p → q with rows marked kept, broken and not broken.How many rows make p → q false?42 secTable of tautology, contradiction and contingency with examples.Is p ∧ ~p a tautology?37 sec
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Full Computer Systems lessonsAll KwickClips

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