@@ -0,0 +1,31 @@
+    org 0x0100
+start:
+    mov ax,0x64     ; Load register AX with 0x64 (100 decimal)
+    mov cl,0x21     ; Load register CL with 0x1E (33 decimal)
+    div cl          ; Divide AX by CL, result->AL, remainder->AH
+
+    add al,0x30     ; Convert to ASCII digit
+    call display_letter
+
+    int 0x20
+
+    ; Display letter contained in AL (ASCII code)
+display_letter:
+    push ax
+    push bx
+    push cx
+    push dx
+    push si
+    push di
+
+    mov ah,0x0E         ; Load AH with code for terminal output
+    mov bx,0x000F       ; Load BH page zero and BL color (graphic mode)
+    int 0x10            ; Call the BIOS for displaying one letter
+
+    pop di
+    pop si
+    pop dx
+    pop cx
+    pop bx
+    pop ax
+    ret                 ; Return to the caller
@@ -0,0 +1,33 @@
+    org 0x0100
+start:
+    mov al,0x32     ; Load register AL with 0x32 (50 decimal)
+    and al,0x0F     ; Logical AND AL with 0x0F
+    ; and, or, xor
+    ; not is a single register
+    ; neg AL is AL = -AL
+
+    add al,0x30     ; Convert to ASCII digit
+    call display_letter
+
+    int 0x20
+
+    ; Display letter contained in AL (ASCII code)
+display_letter:
+    push ax
+    push bx
+    push cx
+    push dx
+    push si
+    push di
+
+    mov ah,0x0E         ; Load AH with code for terminal output
+    mov bx,0x000F       ; Load BH page zero and BL color (graphic mode)
+    int 0x10            ; Call the BIOS for displaying one letter
+
+    pop di
+    pop si
+    pop dx
+    pop cx
+    pop bx
+    pop ax
+    ret                 ; Return to the caller
@@ -0,0 +1,31 @@
+    org 0x0100
+start:
+    mov al,0x03     ; Load register AL with 0x03
+    mov cl,0x02     ; Load register CL with 0x02
+    mul cl          ; Multiply AL by CL, result into AX
+
+    add al,0x30     ; Convert to ASCII digit
+    call display_letter
+
+    int 0x20
+
+    ; Display letter contained in AL (ASCII code)
+display_letter:
+    push ax
+    push bx
+    push cx
+    push dx
+    push si
+    push di
+
+    mov ah,0x0E         ; Load AH with code for terminal output
+    mov bx,0x000F       ; Load BH page zero and BL color (graphic mode)
+    int 0x10            ; Call the BIOS for displaying one letter
+
+    pop di
+    pop si
+    pop dx
+    pop cx
+    pop bx
+    pop ax
+    ret                 ; Return to the caller
@@ -1,17 +1,29 @@
-all: FIRST.COM SECOND.COM ADD1.COM SUB1.COM
+all: FIRST.COM SECOND.COM ADD1.COM SUB1.COM MUL1.COM DIV1.COM SHIFT1.COM LOGICAL1.COM
 
 clean:
-	DEL *.COM
-	DEL *.LST
+	del *.COM
+	del *.LST
 
 FIRST.COM: FIRST.ASM
-	NASM -f bin FIRST.ASM -o FIRST.COM -l FIRST.LST
+	nasm -f bin FIRST.ASM -o FIRST.COM -l FIRST.LST
 
 SECOND.COM: SECOND.ASM
-	NASM -f bin SECOND.ASM -o SECOND.COM -l SECOND.LST
+	nasm -f bin SECOND.ASM -o SECOND.COM -l SECOND.LST
 
 ADD1.COM: ADD1.ASM
-	NASM -f bin ADD1.ASM -o ADD1.COM -l ADD1.LST
+	nasm -f bin ADD1.ASM -o ADD1.COM -l ADD1.LST
 
 SUB1.COM: SUB1.ASM
-	NASM -f bin SUB1.ASM -o SUB1.COM -l SUB1.LST
+	nasm -f bin SUB1.ASM -o SUB1.COM -l SUB1.LST
+
+MUL1.COM: MUL1.ASM
+	nasm -f bin MUL1.ASM -o MUL1.COM -l MUL1.LST
+
+DIV1.COM: DIV1.ASM
+	nasm -f bin DIV1.ASM -o DIV1.COM -l DIV1.LST
+
+SHIFT1.COM: SHIFT1.ASM
+	nasm -f bin SHIFT1.ASM -o SHIFT1.COM -l SHIFT1.LST
+
+LOGICAL1.COM: LOGICAL1.ASM
+	nasm -f bin LOGICAL1.ASM -o LOGICAL1.COM -l LOGICAL1.LST
@@ -0,0 +1,30 @@
+    org 0x0100
+start:
+    mov al,0x02     ; Load register AL with 0x02 (2 decimal)
+    shl al,1        ; Shift AL left by one bit
+
+    add al,0x30     ; Convert to ASCII digit
+    call display_letter
+
+    int 0x20
+
+    ; Display letter contained in AL (ASCII code)
+display_letter:
+    push ax
+    push bx
+    push cx
+    push dx
+    push si
+    push di
+
+    mov ah,0x0E         ; Load AH with code for terminal output
+    mov bx,0x000F       ; Load BH page zero and BL color (graphic mode)
+    int 0x10            ; Call the BIOS for displaying one letter
+
+    pop di
+    pop si
+    pop dx
+    pop cx
+    pop bx
+    pop ax
+    ret                 ; Return to the caller