1. Express the following bit patterns in hexadecimal notation:
  
   a) 101010101010
   b) 110010110111
   c) 000011101011

2. Provide the bit patterns corresponding to the following hexadecimal 
   numbers.

   a)  bc
   b)  67
   c) 90a
   d) 100
   e) ff0

3. Determine the most significant bit of the bit patterns corresponding
   to the following hexadecimal numbers.
  
   a) 1f
   b) ff
   c) 70

4. A computer monitor can display 24 lines of text each of which can 
   contain 80 characters. If the contents of the screen were stored
   in memory by representing each character by its ASCII code (one
   character per byte), how many bytes of memory would be required 
   to hold the entire screen image?

5. Suppose a picture is represented by a grid of 1024 columns and 768
   rows. If eight bits are required for each pixel, how many bytes of
   memory would be required to hold the entire image.

6. The following is a message coded in ASCII, using one byte per 
   character, and then represented in hexadecimal. What is the message?

             68657861646563696d616c

7. The following bit patterns are in excess 16 notation. Convert each
   pattern to its equivalent decimal representation.

   a) 10000
   b) 10011
   c) 01101
   d) 01111
   e) 10111

8. The following bit patterns are in excess 64 notation. Convert each
   pattern to its equivalent decimal representation.

   a) 1000000
   b) 1001010
   c) 0101001

9. Convert each of the following decimal numbers to excess 32 notation.

   a)  12
   b) -17
   c) -10