15 May EXPLAIN THE FUNCTIONS OF ALL OF MARIE’S REGISTERS.
· Answer these questions:
(a) How does the ALU know which function to perform?
(b) Explain clearly how the fetch-decode-execute cycle works. (What are its steps? Explain each step)
(c) Why is it that if MARIE has 4K words of main memory, addresses must have 12 bits?
(d) What is an opcode?
(e) Explain the functions of all of MARIE’s registers.
(f) Explain each step the the MARIE instruction STORE performs.
(g) Describe how an interrupt works and name four different types.
Answer exercise 13 on page 283.
A digital computer has a memory unit with 24 bits per word. The instructions set consists of 150 different operations. All instructions have an operation code part (opcode) and an address part (allowing for only one address). Each instruction is stored in one word memory.
a) how many bits are needed for the opcode?
b) how many bits are left for the address part of the instruction?
c) what is the maximum allowable size for memory?
d) what is the largest unsigned binary number that can be accommodated in one word memory?
Answer exercise 14 on page 283.
A digital computer has a memory unit with 32 bits per word. The instruction set consists of 110 different operations. All instructions have an operation code part (opcode) and two address fields: one for a memory address and one for a register address. This particular system includes eight general-purpose, user-addressable registers. Registers may be loaded directly from memory and memory may be updated directly from the registers. Direct memory-to-memory data movement operations are not supported. Each instruction is stored in one word of memory.
a) how many bits are needed for the opcode?
b) how many bits are needed to specify the register?
c) how many bits are left for the memory address part of the instruction?
d) what is the maximum allowable size for memory?
e) what is the largest unsigned binary number that can be accommodated in one word of memory?
Answer exercise 24 on page 285.
Consider the MARIE program below.
a) list the hexadecimal code for each instruction.
b) draw the symbol table.
c) what is the value stored in the AC when the program terminates?
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