2017 01 – CS 3843 Computer Organization – Exam #1 Page 1
(50 pts) CS3843 CompOrg Exam #1 Name/abc123:___________________
Conversions: (50 pts)
1. (8 pts) Convert the following decimal numbers to hexadecimal. Assume 8-bits.
a. -55 ______
b. 152 ______
2. (8 pts) Convert the following hexadecimal values to decimal. Assume 8-bits and show the signed and
unsigned values.
a. 0x86 Signed: _____ Unsigned: _____
b. 0xFE Signed: _____ Unsigned: _____
3. (4 pts) Convert the binary number to hex and the hex number to binary.
a. 1110010101001
2
_______
b. 0xB15 _________________
4. (8 pts) For the numbers below, perform the operations as dictated byte the table. (Hint: last 3, use binary)
Operations: ADD OR AND XOR
0xAC 0xAC 0xAC 0xAC
0x92 0x92 0x92 0x92
Results:
5. (4 pts) For the ADD instruction, what is the value of the following flags after the operation: (Assume 8 bits.)
a. CF: _____ SF: _____ OF: _____ ZF: _____
6. (2 pts) What hex number would you add to 0x3D to set the ZERO flag? _____
