diff --git a/mp-lab/8086/01_add.asm b/mp-lab/8086/01_add.asm
new file mode 100644
index 0000000..e101430
--- /dev/null
+++ b/mp-lab/8086/01_add.asm
@@ -0,0 +1,126 @@
+; @nlkguy
+; addition
+; NANDULAL KRISHNA
+; 20221097
+; S5 CSB
+
+.model small
+.data
+	msg1 db 13, 10, "num1 : $"
+	msg2 db 13, 10, "num2 : $"
+	sum db 13, 10, "sum : $"
+
+.code
+.stack
+
+start:
+
+	mov ax, @data
+	mov ds, ax
+
+	lea dx, msg1
+	mov ah, 09h
+	int 21h
+
+	call input
+	mov bh, dl
+
+
+	lea dx, msg2
+	mov ah, 09h
+	int 21h
+
+	call input
+	mov bl, dl
+
+
+	; add
+	mov ax, 0000h
+	mov al, bl
+	mov cx, 0000h
+	mov cl, bh
+	add ax, cx
+	mov bx, ax
+
+
+	mov ah, 09h
+	lea dx, sum
+	int 21h
+
+
+	call output
+	mov bh, bl
+	call output
+
+
+	mov ah, 4ch
+	int 21h
+
+;-----------------------------
+input proc
+
+	call inputnum	; get 1st digit
+	mov cl, 04h	; cl = 4
+	rol dl, cl	; rotate DL 4 times left(shift first digit to left nibble)
+	and dl, 00f0h 	; clear lower nibble
+	mov ch, dl	; move to CH
+
+
+	call inputnum	; get 2nd digit to DL
+	and dl, 000fh	; AND -
+	add dl, ch	; add to DL
+
+	ret
+input endp
+;-----------------------------
+inputnum proc
+	mov ah, 01h
+	int 21h
+
+	cmp al, 'A'	; compare with character A
+	jc  inputnum_is_dec	; if lessthan A , it is decimal
+	jmp inputnum_is_hex	; or hex
+inputnum_is_hex:
+	sub al, 'A'
+	add al, 0ah
+	mov dl, al
+	ret
+inputnum_is_dec:
+	sub al, '0'
+	mov dl, al
+	ret
+inputnum endp
+;-----------------------------
+output proc
+	mov al, bh
+	and al, 00f0h
+	mov cl, 04h
+	ror al, cl
+	mov dl, al
+	call outputnum
+
+	mov dl, bh
+	and dl, 000fh
+	call outputnum
+
+	ret
+output endp
+;-----------------------------
+outputnum proc
+	mov ah, 02h
+
+	cmp dl, 0ah
+	jc  outputnum_is_dec
+	jmp outputnum_is_hex
+outputnum_is_hex:
+	add dl, 'A'
+	sub dl, 0ah
+	int 21h
+	ret
+outputnum_is_dec:
+	add dl, '0'
+	int 21h
+	ret
+outputnum endp
+;-----------------------------
+end start
diff --git a/mp-lab/8086/02_mul.asm b/mp-lab/8086/02_mul.asm
new file mode 100644
index 0000000..39e0a37
--- /dev/null
+++ b/mp-lab/8086/02_mul.asm
@@ -0,0 +1,125 @@
+; @nlkguy
+; multiplication
+; NANDULAL KRISHNA
+; 20221097
+; S5 CSB
+
+.model small
+.data
+	ms1 db 13, 10, "num1 : $"
+	ms2 db 13, 10, "num2 : $"
+	prod db 13, 10, "product :  $"
+
+.code
+.stack
+
+start:
+
+	mov ax, @data
+	mov ds, ax
+
+	lea dx, ms1
+	mov ah, 09h
+	int 21h
+
+	call input
+	mov bh, dl
+
+
+	lea dx, ms2
+	mov ah, 09h
+	int 21h
+
+	call input
+	mov bl, dl
+
+
+	mov al, bl
+	mul bh
+	mov bx, ax
+
+
+	mov ah, 09h
+	lea dx, prod
+	int 21h
+
+
+	call output
+	mov bh, bl
+	call output
+
+
+	mov ah, 4ch
+	int 21h
+	
+;---------------------------------
+
+input proc
+
+	call inputnum
+	mov cl, 04h
+	rol dl, cl
+	and dl, 00f0h
+	mov ch, dl
+
+
+	call inputnum
+	and dl, 000fh
+	add dl, ch
+
+	ret
+input endp
+;---------------------------------
+inputnum proc
+	mov ah, 01h
+	int 21h
+
+	cmp al, 'A'
+	jc  inputnum_is_dec
+	jmp inputnum_is_hex
+inputnum_is_hex:
+	sub al, 'A'
+	add al, 0ah
+	mov dl, al
+	ret
+inputnum_is_dec:
+	sub al, '0'
+	mov dl, al
+	ret
+inputnum endp
+
+;---------------------------------
+output proc
+	mov al, bh
+	and al, 00f0h
+	mov cl, 04h
+	ror al, cl
+	mov dl, al
+	call outputnum
+
+	mov dl, bh
+	and dl, 000fh
+	call outputnum
+
+	ret
+output endp
+;---------------------------------
+outputnum proc
+	mov ah, 02h
+
+	cmp dl, 0ah
+	jc  outputnum_is_dec
+	jmp outputnum_is_hex
+outputnum_is_hex:
+	add dl, 'A'
+	sub dl, 0ah
+	int 21h
+	ret
+outputnum_is_dec:
+	add dl, '0'
+	int 21h
+	ret
+outputnum endp
+;---------------------------------
+
+end start
diff --git a/mp-lab/8086/03_concat.asm b/mp-lab/8086/03_concat.asm
new file mode 100644
index 0000000..de2f366
--- /dev/null
+++ b/mp-lab/8086/03_concat.asm
@@ -0,0 +1,92 @@
+
+; @nlkguy
+; string concat
+; NANDULAL KRISHNA
+; 20221097
+; S5 CSB
+
+
+data segment
+	str1 db 30 dup("  $")
+	str2 db 30 dup("$")
+	m1 db 13,10,"str 1 : $"
+	m2 db 13,10,"str 1 : $"
+	outp db 13,10,"str 1 : $"
+	wel db 13,10,"string concat ---- $"
+data ends
+
+code segment
+assume cs:code , ds:data
+start:
+      mov ax,data
+      mov ds,ax
+      mov cl,04
+      
+      lea dx,wel
+      mov ah,09h
+      int 21h
+      
+      lea dx,m1
+      mov ah,09h
+      int 21h
+       
+      loop0:mov ah,01h
+           int 21h
+           cmp al,13
+           je skip
+           mov [si],al
+           inc si
+           jmp loop0
+           
+      skip:mov ah,09h
+           lea dx,m2
+           int 21h
+     
+      lea si,str2
+      loop1:mov ah,01h
+            int 21h
+            cmp al,13
+            je skip1
+            mov [si],al
+            inc si
+            jmp loop1
+            
+      skip1:call concat
+            
+            mov ah,4ch
+            int 21h
+            
+concat proc
+       lea si,str1
+       lea di,str2
+       mov al,"$"
+       
+       loop2: cmp al,[si]
+              jz loop3
+              inc si
+              jmp loop2
+              
+       loop3: 
+              cmp al,[di]
+              jz exit
+              mov bl,[di]
+              mov [si],bl
+              inc si
+              inc di
+              jmp loop3
+              
+       exit: mov [di],al
+             lea dx,outp
+             mov ah,09h
+             int 21h
+             lea dx,str1
+             mov ah,09h
+             int 21h
+             ret
+concat endp
+code ends
+end start
+            
+            
+      
+
diff --git a/mp-lab/8086/04_replace.asm b/mp-lab/8086/04_replace.asm
new file mode 100644
index 0000000..d357bbc
--- /dev/null
+++ b/mp-lab/8086/04_replace.asm
@@ -0,0 +1,126 @@
+
+; @nlkguy
+; string replace
+; NANDULAL KRISHNA
+; 20221097
+; S5 CSB
+
+
+data segment
+	str1 db 20 dup("$")
+	str2 db 20 dup("$")
+	newstr db 20 dup("$")
+	
+	wel db 13,10,"string replace ---- $"
+	mainstr db 13,10,"str 1 : $"
+	replstr db 13,10,"str rep : $"
+	newstring db 13,10,"str new : $"
+	outstring db 13,10,"str 1 : $"
+	foundstring db 13,10,"found $"
+	notstring db 13,10,"no found $"
+		
+data ends
+
+
+code segment
+	assume cs:code , ds:data
+start:
+      mov ax,data
+      mov ds,ax
+      
+      lea dx,wel
+      mov ah,09h
+      int 21h
+      
+      lea dx,mainstr
+      mov ah,09h
+      int 21h
+       
+      loop0:mov ah,01h
+           int 21h
+           cmp al,13
+           je skip
+           mov [si],al
+           inc si
+           jmp loop0
+           
+      skip:mov ah,09h
+           lea dx,replstr
+           int 21h
+     
+      lea si,str2
+      loop1:mov ah,01h
+            int 21h
+            cmp al,13
+            je skip1
+            mov [si],al
+            inc si
+            jmp loop1
+            
+      skip1:mov ah,09h
+           lea dx,newstring
+           int 21h
+      
+      lea si,newstr
+      loop2:mov ah,01h
+            int 21h
+            cmp al,13
+            je skip2
+            mov [si],al
+            inc si
+            jmp loop2
+      
+      
+      skip2: call replace
+     
+            
+            mov ah,4ch
+            int 21h
+            
+replace proc
+       lea si,str1
+       lea di,str2
+       mov al,"$"
+       
+       
+       compare:cmp al,[si]
+               je nosub
+               mov bl,[si]
+               cmp bl,[di]
+               je copy
+               inc si
+               jmp compare
+       
+       copy: mov cx,si
+             lea di,newstr
+             jmp loop3
+             
+       nosub:lea dx,notstring
+             mov ah,09h
+             int 21h 
+             mov ah,4ch
+            int 21h
+          
+       
+              
+       loop3: 
+              cmp al,[di]
+              jz exit
+              mov bl,[di]
+              mov [si],bl
+              inc si
+              inc di
+              jmp loop3
+              
+       exit: mov [di],al
+             lea dx,outstring
+             mov ah,09h
+             int 21h
+             lea dx,str1
+             mov ah,09h
+             int 21h
+             ret
+replace endp
+code ends
+end start
+            
diff --git a/mp-lab/8086/temp.asm b/mp-lab/8086/temp.asm
new file mode 100644
index 0000000..4bbdf84
--- /dev/null
+++ b/mp-lab/8086/temp.asm
@@ -0,0 +1,49 @@
+.model small
+.data
+    stringarray1 db 30 dup("$")
+    message1 db 13,10, "this is a god$"
+    message2 db 13,10, "you have done wrong$"
+.code
+.stack
+start:
+    mov ax,@data
+    mov ds,ax
+
+    lea dx,message1
+    mov ah,09h
+    int 21h
+
+    lea dx,message2
+    mov ah,09h
+    int 21h
+
+    call input_string
+    call output_string
+
+    call exit
+
+
+
+exit proc
+    mov ah,4ch
+    int 21h
+exit endp
+
+input_string proc
+    loopin: lea ah,01h
+            int 21h
+            cmp al,13
+            je skip
+            mov [si],al
+            inc si
+            jmp loopin
+    skip:   call output_string
+
+input_string endp
+
+output_string proc
+      
+output_string endp
+
+
+end start
\ No newline at end of file
diff --git a/mp-lab/8086/temp2.asm b/mp-lab/8086/temp2.asm
new file mode 100644
index 0000000..bb6518a
--- /dev/null
+++ b/mp-lab/8086/temp2.asm
@@ -0,0 +1,91 @@
+.model small
+.stack 100h
+
+print macro  msg
+    mov dx,offset msg
+    mov ah,9h
+    int 21h
+endm
+
+print_num macro num
+     mov dl,num
+     add dl,"0"
+     mov ah,2
+     int 21h
+endm
+
+
+input_str macro string,len
+    local loop1,skip
+    mov si,0
+    loop1:
+        call input
+        cmp al,13
+        je skip
+        mov string[si],al
+        inc si
+        jmp loop1
+        skip:
+            mov string[si],"$"
+        mov len,si
+endm
+
+data segment
+    msg1 db 10,13,"Enter the string 1",10,13,"$"
+    msg2 db 10,13,"Enter the string 2","$"
+    no_equal db 10,13,"strings are not equal","$"
+    equal db 10,13,"strings are equal","$"
+
+    str1 db 10,?,10 dup("$")
+    str2 db 10,?,10 dup("$")
+    len1 db 0
+    len2 db 0
+data ends
+
+code segment
+    assume ds:data,cs:code
+    start:
+        mov ax,data
+        mov ds,ax
+
+        print msg1
+
+        input_str str1,len1
+
+        print_num len1
+
+         print msg2
+
+        input_str str2,len2
+
+        mov al,len1
+        cmp al,len2
+        jne not_equal
+        mov si,0
+        loop1:
+            mov al,str1[si]
+            cmp al,"$"
+            je print_equal
+            cmp al,str2[si]
+            jne not_equal
+            inc si
+            jmp  loop1
+
+        print_equal:
+            print equal
+            jmp exit
+        not_equal:
+            print no_equal
+
+
+    exit:
+        mov ah,4ch
+        int 21h
+
+    input:
+        mov ah,01h
+        int 21h
+        ret
+
+code ends
+end start
\ No newline at end of file