Computer Architecture

The format of this document is as follows: First, I give a practice problem for which the solution is also provided. In bold italic font, I slightly modify the problem for your homework.

4) Suppose we have the instruction Load 1000. Given that the main memory contains the values below and also given that register R1 implied in the indexed addressing mode contains 0x200, determine the actual value loaded into the accumulator and fill in the table below.

Address Content

0x1000	0x1400
...	...
0x1100	0x400
...	...
0x1200	0x1000
...	...
0x1300	0x1100
...	...
0x1400	0x1300

Mode	Value loaded into AC
Immediate	?
Direct	?
Indirect	?
Indexed	?

HW PROBLEM 4: Redo the question for LOAD 1200.

SOLUTION:

Mode	Value loaded into AC
Immediate	1000
Direct	1400
Indirect	1300
Indexed	1000

We have direct and indirect addressing modes in MARIE.