With
DMA, the CPU does not even get involved in moving the data into or out of main memory. Once the CPU tells
the DMA controller where the data reside and how much data to transfer, the DMA controller takes care of the
entire task, and interrupts only when the entire task is complete.
REVIEW QUESTIONS
3.1 Write the number 229 in base 2.
3.2 What is the base-10 value of 11100101?
3.3 What are the units (values) of the first 3 columns in a base-8 (octal) number?
3.4 What is the base-2 value of the base-8 (octal) number 377?
3.5 Convert the following base-10 numbers to base 2:
37
470
1220
17
99
3.6 Convert the following base-2 numbers to base 10:
00000111
10101010
00111001
01010101
00110011
3.7 Assume a 16-bit signed integer data representation where the sign bit is the msb.
a What is the largest positive number that can be represented?
b Write the number 17,440.
c Write the number ??’20.
d What is the largest negative number that can be represented?
3.8 Using ASCII encoding, write the bytes to encode your initials in capital letters. Follow each letter with a period.
3.9 Referring to the list of Intel x86 instructions in this chapter, arrange a set of instructions to add the values
stored in memory locations 50 and 51, and then to store the result in memory location 101.
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