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وجدت في كتاب Assembly Language Programming And Organization of the IBM PC
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http://www.4shared.com/document/2ac5ylqX/Part1.html
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سؤال رقم واحد
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?
سؤال رقم 2
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.
سؤال رقم 3
What is the maximum length (in bytes) of an instruction for the 8086-based IBM PC?
سؤال رقم 4
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?
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