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(Solution Download) Suppose the memory cells at addresses AF through B1 in the machine described in Appendix C contain...

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1. Suppose the memory cells at addresses AF through B1 in the machine described in Appendix C contain the following bit patterns:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Address

 

 

Contents

 

 

AF

 

 

B0

 

 

B0

 

 

B0

 

 

B1

 

 

AF

 

 

What would happen if we started the machine with its program counter containing AF?

 

2. Suppose the memory cells at addresses 00 through 05 in the machine described in Appendix C contain the following (hexadecimal) bit patterns:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Address

 

 

Contents

 

 

0

 

 

25

 

 

1

 

 

B0

 

 

2

 

 

35

 

 

3

 

 

4

 

 

4

 

 

C0

 

 

5

 

 

00

 

 

If we start the machine with its program counter containing 00, when does the machine halt? 23. In each of the following cases, write a short program in the machine language described in Appendix C to perform the requested activities. Assume that each of your programs is placed in memory starting at address 00.

 

a. Move the value at memory location D8 to memory location B3.

 

b. Interchange the values stored at memory locations D8 and B3.

 

c. If the value stored in memory location 44 is 00, then place the value 01 in memory location 46; otherwise, put the value FF in memory location 46.

 







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