أسئلة الدرس الأول

Suppose memory bytes 0-4 have the following contents:
Address contents
0 01101010
1 11011101
2 00010001
3 11111111
4 01010101
A. Assuming that a word is 2 bytes, what are the contents of
• The memory word at address 2?
• The memory word at address 3?
• The memory word whose high byte is the byte at address 2?

B. What is
• Bit 7 of byte 2?
• Bit 0 of word 3?
• Bit 4 of byte 2?
• Bit 11 of word 2?

السؤال الثاني
A nibble is four bits. Each byte is composed of a high nibble and a low nibble, similar to the high and low bytes of a word. Using the data in exercise 1, give the contents of
A. The low nibble of byte 1.
B. The high nibble of byte 4.

السؤال الثالث
The two kinds of memory are RAM and ROM. Which kind of memory
a. Holds a user’s program?
b. Holds the program used to start the machine?
c. Can be changed by user?
d. Retains its contents, even when the power is turned off?

السؤال الرابع

4. What is the function of
a. The microprocessor?
b. The buses?

السؤال الخامس
5. The two parts of the microprocessor are the EU and the BIU.
a. What is the function of the EU?
b. What is the BIU?

السؤال السادس
In the Microprocessor, what is the function of
a. The IP?
b. The ALU?

السؤال السابع
A. What are the I/O ports used for?
B. How are they different from memory locations?

السؤال الثامن
What is the maximum lenghth (in bytes) of an instruction for the 8086-based IBM PC?

السؤال التاسع
9. consider a machine language instruction that moves a copy of the contents of register AX in the CPU to a memory word. What happens during?
a. the fetch cycle?
b. the execute cycle?

السؤال العاشر

10. Give
A. three advantages of high-level language programming.
B. the primary advantage of assembly language programming.