Problem 1 (18 pts)
Part 1 (6 pts)
- SENTINEL
- It is not a part of the data set

Part 2 (6 pts)

MUL Ri, Rj, Rk - It is the most complicated of all the instructions.
- MOVE Ri, Rj can be implemented with ADD Ri, Rj, Rk
- NAND Ri, Rj, Rk can be implemented with AND Ri, Rj, Rk followed by NOT Ri
- SHFL Ri, Rj, #2 can be implemented using MUL

Part 3 (6 pts)
Code w/out STI

      .ORIG	x3000
      LD	R0, CONST
      LD	R1, B		; solution
      STR	R0, R1, #0	; solution
      TRAP	x25
CONST .FILL	x0048
B     .FILL	xF3FF
      .END

Problem 2 (15 pts)
Symbol Table
D      x3001
E      x3004
B      x3005
F      x3007
A      x300A
C      x300B

Instruction   Machine Code
D	      0010 001 000001010
E	      0001 001 001 1 11111
F	      0000 001 000000101

Descr of program:
Adds up the odd numbers less than or equal to the value stored at A.

Problem 3 (10 pts)
After the zero in R0 is stored to x3007, the trap x22 terminates early, resulting in the following being printed to the screen:

FUN

Problem 4 (10 pts)
R0	xA400
R1	x23FF
R2	xE1FF
R3	xA401
R4	x0000
R5	x0000
R6	x0000
R7	x0000

Problem 5 (10 pts)
Error # 1
Line 8, Assemble Time, Undefined symbol SUM

Error # 2
Line 3, Run Time, Used uninitialized register R1 as source operand

Problem 6 (15 pts)
Push R4
Push R1
Pop  R0
Push R3
Pop  R2
Pop  R7

Problem 7 (20 pts)
Missing instructions (in order from top of page)

ADD	R1, R1, #1
TRAP	x25
ADD	R0, R0, #5
BRzp	K