BITS 16 start: ;Clears screen ;---------------------------------------------- mov ah, 0x0F ;get current video mode int 0x10 ;get video mode mov ah, 0x00 ;set video mode int 0x10 ;reset screen mov ah, 0x02 ;set cursor pos int 0x10 ;set pos ;---------------------------------------------- mov dl,1 .repeat: lodsb ; Get character from string cmp al, 0 je .cursor_pointer; If char is zero, end of string int 10h ; Otherwise, print it jmp .repeat .cursor_pointer: mov ah,2h ;set the value to "ah" to move the cursor pointer mov bh,0 ;select page mov dh,22 ;set row position of the cursor add dl,1 ;set column position of the cursor int 10h ;tell bios "hey dude now we are done,take action!!!" jmp .character_read .character_read: mov ah,4h mov ah,00h ;remeber set the value to "ah" now you are going to read a keyboard input int 16h ;this interrupt is given to control keystrokes of keyboard jmp .print_input ;now lets print what we took as input .print_input: mov ah,9h ;set the value to "ah" to print one character to std out mov bh,0 ;set page number mov bl,5h ;set the color attribute of the font to be print mov cx,1 ;set the value how many time the character in "al" should be print int 10h ;tell bios "hey dude now we are done,take action!!!" jmp .cursor_pointer times 510-($-$$) db 0 ; fill up the rest part of the boot secotr with 0 s dw 0xAA55 ; The standard PC boot signature