LC3 Instruction help?

[jchen]

Problem :

 

Replace the store Indirect (1011) instruction in the code with whatever instructions are necessary to perform the same instruction.

 

x3000 0010 0000 0000 0010

x3001 1011 0000 0000 0010

x3002 1111 0000 0010 0101

x3003 0000 0000 0100 1000

x3004 1111 0011 1111 1111

 

I know I'm going to be pulling the memory from x3004 into R0 ( R0 <-- M(3003)) and then that's going to be going into M(M(3004)) <--R0 , but I tried looking at the instructions contained at that location (3004), and if it's signed, then it's a negative value? How do I find a memory location at a negative value? Can anyone tell me if I'm even thinking in the right direction?

Edited April 19, 2014 by jchen