diff --git a/4. Fourth_Semester/Computer-Organisation-Architecture(COA)/LAB4/Codes/OBJ1.s b/4. Fourth_Semester/Computer-Organisation-Architecture(COA)/LAB4/Codes/OBJ1.s
new file mode 100644
index 0000000..1607eb9
--- /dev/null
+++ b/4. Fourth_Semester/Computer-Organisation-Architecture(COA)/LAB4/Codes/OBJ1.s	
@@ -0,0 +1,11 @@
+.global _start
+_start:
+	
+	mov r0,#0x03
+	mov r1, #0x05
+	add r2,r0,#0x08
+	subs r3,r1,#0x04
+	
+s: 
+		b s
+		.end
\ No newline at end of file
diff --git a/4. Fourth_Semester/Computer-Organisation-Architecture(COA)/LAB4/Codes/OBJ2.s b/4. Fourth_Semester/Computer-Organisation-Architecture(COA)/LAB4/Codes/OBJ2.s
new file mode 100644
index 0000000..67445cf
--- /dev/null
+++ b/4. Fourth_Semester/Computer-Organisation-Architecture(COA)/LAB4/Codes/OBJ2.s	
@@ -0,0 +1,19 @@
+.global _start
+_start:
+	
+	ldr r0,=list
+	ldr r1,[r0],#4
+	ldr r2,[r0],#4
+	
+	add r3,r1,r2
+	subs r4,r1,r2
+	
+	ldr r5,[r0]
+	mul r6,r5,r5
+	
+	mov r7,#1
+	swi 0
+	
+.data
+list:
+	.word 2,3,4
\ No newline at end of file
diff --git a/4. Fourth_Semester/Computer-Organisation-Architecture(COA)/LAB4/OutputScreenshots/OBJ1.png b/4. Fourth_Semester/Computer-Organisation-Architecture(COA)/LAB4/OutputScreenshots/OBJ1.png
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index 0000000..4bc4a7d
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diff --git a/4. Fourth_Semester/Computer-Organisation-Architecture(COA)/LAB4/OutputScreenshots/OBJ2.png b/4. Fourth_Semester/Computer-Organisation-Architecture(COA)/LAB4/OutputScreenshots/OBJ2.png
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index 0000000..1446e1b
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