Name:__________________                                           Quiz #1

Given:
   0x47 is an 8-bit 2's compliment number
   0xC is a 4-bit 2's compliment number

1) What is the value of each in decimal?

0100 0111b = 64+7 = 71
1100 = 4+-8 = -4

2) Show the complete process of adding these two numbers in binary.
     (Show all carries / etc.)  Write the result in Hex.
     Indicate if overflow occurs as well.

Carries: 111111
          01000111
        + 11111100            <- Sign Extension      
       -----------
         101000011 = 0100 0011 as 8-bit

64+3=67 No Overflow / Work Checks

3) If 0x41 is ASCII for the letter 'A', what is 0x47?

0x41 = 'A'
0x42='B'
0x43='C'
0x44='D'
0x45='E'
0x46='F'
0x47='G'

4) Given that a program has 2 million instructions and an average CPI of 1.9,
      what clock speed will the computer need to complete in 0.25 s

2000000insts*1.9colcks/inst = 3800000 clocks
3800000 clocks/ 0.25s = 15,200,000 clocks/s = 15.2 MHz