Question

I am writing a code for the LC3 Simulator. This is in assembly, I need assistance with the numbers 5-8. Thank you.

ALU OPERATIONS

1. Compute the sum X +Y and place it at location x3102.

2. Compute X AND Y and place it at location x3103.

3. Compute X OR Y and place it at location x3104.

4. Compute NOT(X) and place it at location x3105.

5. Compute NOT(Y) and place it at location x3106.

6. Compute X +3 and place it at location x3107.

7. Compute Y −3 and place it at location x3108.

8. If the X is even, place 0 at location x3109. If the number is odd, place 1 at the same location

MY CODE SO FAR (COMPLETED 1-4):

   .ORIG x3000
   LEA R2, xFF   ;R2 Loaded with the begenning address of data
   LDR R1, R1, x0   ;X, located at x3100, and loaded in R1
   LDR R3, R2, x1   ;Y, located at x3101, and loaded in R2

   ;X + Y
   AND R4, R4, x0   ;Clearing R4
   ADD R4, R1, R3   ;Addition of X and Y
   STR R4, R2, x2   ;Storing in x3102

   ;And Gate of X and Y
   AND R4, R4, x0   ;Clearing R4
   AND R4, R1, R3   ;AND gate
   STR R4, R2, x3   ;Storing in x3103

   ;OR of X and Y
   AND R4, R4, x0
   NOT R1, R1
   NOT R3, R3
   AND R4, R1, R3
   NOT R4, R4
   STR R4, R2, x4

   ;RESTORE
   NOT R1, R1
   NOT R3, R3
  
   ;NOT GATE OF X
   AND R4, R4, x0
   AND R4, R1, R1
   NOT R4, R4

Answer 1

PROGRAM:

.ORIG x3000
LEA R2,xFF ; R2 Loaded with the beginning address of data
LDR R1,R2,x0 ; X, located at x3100, and loaded in R1
LDR R3,R2,x1 ; Y, located at x3101, and loaded in R3

; X+Y
AND R4,R4,x0 ; Clearing R4
ADD R4,R1,R3 ; Addition of X and Y
STR R4,R2,x2 ; Storing in x3102

; X AND Y
AND R4,R4,x0 ; Clearing R4
AND R4,R1,R3 ; AND of X and Y
STR R4,R2,x3 ; Storing in x3103

; X OR Y
AND R4,R4,x0 ; Clearing R4
NOT R1,R1 ; Complement R1
NOT R3,R3 ; Complement R3
AND R4,R1,R3 ; AND of X and Y
NOT R4,R4 ; NOT of R4
STR R4,R2,x4 ; Storing in x3104
; Restore X and Y
NOT R1,R1 ; Complement R1
NOT R3,R3 ; Complement R3

; NOT of X
AND R4,R4,x0 ; Clearing R4
AND R4,R1,R1 ; Load R4 with X
NOT R4,R4 ; NOT of X
STR R4,R2,x5 ; Storing in x3105

; NOT of Y
AND R4,R4,x0 ; Clearing R4
AND R4,R3,R3 ; Load R4 with Y
NOT R4,R4 ; NOT of Y
STR R4,R2,x6 ; Storing in x3106

; X+3
AND R4,R4,x0 ; Clearing R4
ADD R4,R1,x3 ; ADD X with 3
STR R4,R2,x7 ; Storing in x3107

; Y-3
AND R4,R4,x0 ; Clearing R4
ADD R4,R4,x3 ; Loading R4 with value 3
NOT R4,R4 ; Complement R4
ADD R4,R4,x1 ; 2's complement of 3
ADD R4,R3,R4 ; ADD Y and -3 to get Y-3
STR R4,R2,x8 ; Storing in x3108

; IS X EVEN OR ODD
AND R4,R4,x0 ; Clearing R4
AND R0,R1,x1 ; AND X with 1 to check the LAB bit
BRZ X_EVEN ; If value is zero, X is enen
ADD R4,R4,x1 ; Else X is ODD, Load R4,1
X_EVEN STR R4,R2,x9 ; Storing in x3109
.END

Please refer to the following screenshot of the program for indentation of code:

OUTPUT:

Data Memory before execution of program:

Data Memory after execution of program: