Simple Boot Loader From Assembly Language

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 [bits 16]  
 [org 0x7c00]  
   
 mov si,msg1  
 call printchar  
 mov si,act1  
 call printchar  
 mov si,msg2  
 call printchar  
   
 jmp $  
   
 printchar:  
   mov al,[si]  
   cmp al,0  
   je next  
   call print  
   inc si  
   call printchar  
   
 print:  
   mov ah,0x0E  
   mov bh,0x00  
   mov bl,0x07  
   int 0x10  
   ret  
 next:  
   ret  
   
 msg1 db "Boot loader starts...",0  
 act1 db "Boot loader executing.......",0  
 msg2 db "Boot loader exits....",0  
   
 times 510-($-$$) db 0  
 dw 0xAA55