1. Which types of data would use LOD and STD instructions? Circle all that apply.

          scalar               array                  struct              object

2. Which types of data would use LDS and STS instructions? Circle all that apply.

          scalar               array                  struct              object

3. Which register holds the address of the data as the LDS or STS instruction is executing?

4. Which register must be used for address arithmetic?

5. Look at the following picture and then execute the 3 machine instructions beginning at 500. Show the values in the registers at the end.

A=  1000
S=  2500
IR= LDS
PC= 503
MBR=1000
MAR=2500

6. Look at the following picture and then execute the 3 machine instructions beginning at 500. Show the values in the registers at the end.

A=  1000
S=  1000
IR= STS
PC= 503
MBR=1000
MAR=1000

7. Suppose you are working on a computer that does not have LDS and STS so it must actually rewrite instructions like "LOD 2500" in order to access successive elements of an array. What do we call such programs? And are they used nowadays?

8. Why are arrays dangerous in most computers?