CS2011 A Term 1999
Prof. Sergio A. Alvarez
HW1 (due Friday Sept. 3)

1) Perform the following conversions. Show your work.

a) 551 d to binary notation.
b) 12A5 h to decimal notation.

2) Express the integer -23 d in each of the following notations (8 bits):

a) sign-magnitude
b) ones complement
c) twos complement

3) Write -7.1875 d in single precision IEEE floating point 
standard 754 notation. Express your answer in hex format.

4) Assume that the debug utility initially shows the 8086 
register/memory contents to be as follows:

AX=0000  BX=0000  CX=0000  DX=0000  SP=FF0C  BP=0000  SI=0000  DI=0000  
DS=12EB  ES=12EB  SS=12EB  CS=0F76  IP=0105   NV UP EI PL NZ NA PO NC 
0F76:0105 8B4C05        MOV CX,[SI+05]

a) Give the new contents of the IP register after the next instruction 
is executed.

b) What are the (hex) contents of registers AX, BX after executing 
the following instructions ? (Assume the 123 and -57 to be in decimal)
   mov ax,123
   mov bx,-57 
   mov [0500],ax
   mov [0506],bx

c) Give the full address in segment:offset form and new contents (hex)
of each of the four distinct memory locations (bytes) that are changed 
by executing the instructions in b).