Suppose the memory cells at addresses 00 through 02 in the machine described in Appendix C contain the following bit patterns:
|
Address |
Contents |
|
0 |
12 |
|
1 |
21 |
|
2 |
34 |
a. What would be the first instruction executed if we started the machine with its program counter containing 00?
b. What would be the first instruction executed if we started the machine with its program counter containing 01?
2. Suppose the memory cells at addresses 00 through 05 in the machine described in Appendix C contain the following bit patterns:
|
Address |
Contents |
|
0 |
12 |
|
1 |
2 |
|
2 |
32 |
|
3 |
42 |
|
4 |
C0 |
|
5 |
00 |
When answering the following questions, assume that the machine starts with its program counter equal to 00.
a. Translate the instructions that are executed into English.
b. What bit pattern is in the memory cell at address 42 when the machine halts?
c. What bit pattern is in the program counter when the machine halts?
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