Final Exam Review 1

Rick is struggling with base conversions again. Convert this decimal number to hex: 100

• x64

• x4

• x12

• x8

Convert this string to ASCII to hex: "I am not"

• x49 x20 x61 x6D x20 x6E x6F x74

• x49 x61 x6D x6E x6F x74

• x73 x32 x97 x109 x32 x110 x111 x116

• x73 x97 x109 x110 x111 x116

What are the reasons why we use 2's complement over signed magnitude

• There is only one zero in 2's complement

• You don't need different operations for addition and subtraction

• The left most bit in 2's complement tells if it's negative or positive

• Sign extension for signed magnitude doesn't exist

Bianca doesn't get how to tell if overflow will happen. If she adds these 2's complement numbers: 1100 + 1100, is there overflow and why?

• No, because the carry out equals the carry in

• No, because we added negative numbers and got a negative number

• Yes, because the carry out is 1

• Yes, because the carry out equals the carry in

What is the result if I sign extend this 4 bit 2's complement number to 8 bits: 1001?

• 1111 1001

• 1111 0001

• 1000 0001

• 0000 1001

What's wrong with this circuit transistor diagram

• Output pin placed at wrong location

• p-type should be in series

• Input pins linked to wrong transistors

• Power and ground connected incorrectly

Convert −15.625 to IEEE

• 1 10000010 11110100000000000000000

• 1 10000001 11001000000000000000000

• 0 10000010 11100100000000000000000

• 1 10000001 01110010000000000000000

Create a truth table for this circuit

• 
• 
• 
• 

Select which statements are true about decoders and muxes (n is the number of selector bits)

• They're both used in building memory

• A mux outputs all 0s except for one 1

Andy thinks that this grey code is valid, Other Andy disagrees and says it makes no sense to start at 100. Who is right?

• Andy

• Other Andy

• Other Andy but for different reasons

• What is grey code?