6. To start executing a computer, the start address of program is loaded into A.
ID: 3877458 • Letter: 6
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6. To start executing a computer, the start address of program is loaded into A. MBR C. PC B. MAR D. accumulator What is the maximum directly addressable memory capacity (in bytes) if the address bus is 11 bits? ( remember that 210-1024-1 K) 7. A. 2 Kbytes C. 10 KBytes B. 4 Kbytes D. 20 Kbytes For a processor with a 30-bit address bus and a 32-bit data bus, how many bits are needed for the program counter? 8. A. 64 C. 30 B. 16 D. 32 9. What is the twos complement representation of-11 A 1111 0101 C 1000 1011 B. 1111 0001 10. What is the range of unsigned numbers that can be represented in binary using &-bits? A. 0 to 255 C -128 to 128 B. -128 to 127 D. 0 to 256Explanation / Answer
6. C. PC
To start executing a computer , the start address of program is loaded into PC (Program Counter) , because the new instruction address should be loaded into the program counter.
7. A. 2Kbytes
The maximum directly addessable memory capacity if the address bus 11 bits is 2Kbytes .
size of each address * number of addresses = 8 * 2n
If n=11 Since (210 Bytes = 1 KB)
Size of memory = 8 * 211 bits = 211 bytes = 21 Kilo Bytes = 2 KB
8. C .30
The program counter needs 30 bits for a processor of 30 bits address bus . The program counter consists of 30 bits block and 2 zeroes and each block having 4 bytes .
9. A. 11110101
The -11 decimal number is converted into 2s complement by using 8 number of bits is given as 11110101.
10. A. 0 to 255
The unsigned 8 bits integer numbers are represented in the range from 0 to 255 in binary .
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