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# Problem Set Answers - John Soto Started Ended Computer...

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John Soto Started: 4/20/10 Ended: Computer Science E-1: Understanding Computers and the Internet Harvard Extension School Fall 2006 Problem Set 1: Hardware 1. 01010100 01010010 01000001 01001110 01010011 01001100 01000001 T 54 R 52 A 41 N 4E S 53 L 4C A 41 01010100 01001001 01001110 01000111 01000010 01001001 01001110 01000001 T 54 I 49 N 4E G 47 B 42 I 49 N 4E A 41 01010010 01011001 01001001 01001110 01010100 01001111 01000001 01010011 R 52 Y 59 I 49 N 4E T 54 O 4F A 41 S 53 01000011 01001001 01001001 01001001 01010011 01010100 01000101 01010010 C 43 I 49 I 49 I 49 S 53 T 54 E 45 R 52 01010010 01001001 01000010 01001100 01011001 01010100 01000101 01000100 R 52 I 49 B 42 L 4C Y 59 T 54 E 45 D 44 01001001 01001111 01010101 01010011, 01001001 01010011 I 49 O 4F U 55 S 53, I 49 S 53 01001110’01010100 01001001 01010100? N 4E’T 54 I 49 T 54? Translating binary into ascii is terribly tedious, isn’t it? 2. 01000011 01000001 01001110 01011001 01001111 01010101 01010011 43 C 41 A 4E N 59 Y 4F O 55 U 53 S 01000001 01011001 "01010000 01000101 01010100 01000101 01010010 41 A 59 Y “50 P 45 E 54 T 45 E 52 R 01010000 01001001 01010000 01000101 01010010 01010000 01001001 01000011 50 P 49 I 50 P 45 E 52 R 50 P 49 I 43 C 01001011 01000101 01000100 01000001 01010000 01000101 01000011 01001011 4B K 45 E 44 D 41 A 50 P 45 E 43 C 4B K 01001111 01000110 01010000 01001001 01000011 01001011 01001100 01000101 4F O 46 F 50 P 49 I 43 C 4B K 4C L 45 E 01000100 01010000 01000101 01010000 01010000 01000101 01010010 44 D 50 P 45 E 50 P 50 P 45 E 52 R 01010011" 01001001 01001110 01000010 01001001 01001110 01000001 53 S 49 I 4E N 42 B 49 I 4E N 41 A 01010010 01011001 01010100 01001000 01010010 01000101 01000101 01010100 52 R 59 Y 54 T 48 H 52 R 45 E 45 E 54 T 01001001 01001101 01000101 01010011, 01000110 01000001 01010011 49 I 4D M 45 E 53 S 46 F 41 A 53 S 01010100? 54 T Can you say Peter Piper picked a peck of pickled peppers in binary THREE TIMES FAST?

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3. 01010100 01001000 01000101 01000001 01001110 01010011 01010111 54 T 48 H 45 E 41 A 4E N 53 S 57 W 01000101 01010010 01010011 01010100 01001111 01010100 01001000 01000101 45 E 52 R 53 S 54 T 4F O 54 T 48 H 45 E 01000101 01011000 01010100 01010010 01000001 01000011 01010010 01000101 45 E 58 X 54 T 52 R 41 A 43 C 52 R 45 E 01000100 01001001 01010100 01000001 01010010 01000101 6175230925 44 D 49 I 54 T 41 A 52 R 45 E (01010111 01001000 01001001 01000011 01001000 01001001 01010011 (57 W 48 H 49 I 43 C 48 H 49 I 53 S 01000100 01000001 01010110 01001001 01000100’01010011 01010000 01001000 44 D 41 A 56 V 49 I 44 D 53 S 50 P 48 H 01001111 01001110 01000101 01001110 01010101 01001101 01000010 01000101 4F O 4E N 45 E 4E N 55 U 4D M 42 B 45 E 01010010) 01000001 01001110 01000100 11111111111111111111111111111110. 52 R) 41 A 4E N 44 D 4,294,967,294. 01000001 01010010 01000101 01001110'01010100 01011001 01001111 01010101 41 A 52 R 45 E 4E N 54 T 59 Y 4F O 55 U 01000111 01001100 01000001 01000100 01011001 01001111 01010101 01010111 47 G 4C L 41 A 44 D 59 Y 4F O 55 U 57 W 01000101 01001110 01010100 01010100 01001111 01000001 01001100 01001100 45 E 4E N 54 T 54 T 4F O 41 A 4C L 4C L 01010100 01001000 01001001 01010011 01010100 01010010 01001111 01010101 54 T 48 H 49 I 53 S 54 T 52 R 4F O 55 U 01000010 01001100 01000101 01001110 01001111 01010111? 42 B 4C L 45 E 4E N 4F O 57 W? 1111 1111 1111 1111 1111 1111 1111 1110 = 2^32 – 2 = 4,294,967,294 The answers to the extra credit are (which is David’s phone number) and 4,294,967,294. Aren’t you glad you went to all this trouble now? 1. How do you represent the decimal number 8 in binary? 1000 2. How do you represent the binary number 11 in decimal? 3 3. What’s the largest, positive value that you can represent with 16 bits? 1111 1111 1111 1111 = 2^15 – 1 = 32,767 A motherboard is the main circuit board of a computer. 4. The PS2 connector is used for a mouse or keyboard. 5. The USB connector also supports mice, keyboards and all kinds of peripherals like printers, scanners, and cameras. 6. The PCI connector attaches sound cards, network cards and other cards.
7. This connector contains the CPU. 8. This connector contains RAM. 9. This connector connects the harddrive, cd drive and other storage on the computer system, also known as IDE connector. 10. Suppose that you buy a brand-new computer and your mom sneaks into your room (right past the “no girls allowed” sign) and uses it while you’re at school. Unfortunately, she can’t save her work, since your computer hasn’t a FDD! In fact, it turns out that that certain brands of new computers don’t have FDDs. Hypothesize why. Is such a good thing?

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