Ku-DOS Project bootloader

kudos-boot.asm

;KudOS bootdisk (c) Ryan Salvador 04-Jan-2015

         bits    16                      ;It says we want our code in real mode.
         org     0

         jmp     07c0h:begin             ;The effective address of the start
                                         ;of our bootloader.

bootmsg  db      'Ku-DOS bootdisk alpha v.1 (c) 2015-2020',10,13,'!Boot successful',10,13,'# ',0 

begin:

         mov     ax, cs                  ;We copy the address of our code segment to
         mov     ds, ax                  ;the ax register and copy it to data segment
         mov     es, ax                  ;for us to define data.

         mov     ax, 0003h               ;Setup video mode
         int     10h

         mov     si, bootmsg

echo:                                    ;Our print routine.
         lodsb
         cmp     al, 0
         je      end
         mov     ah, 0eh
         int     10h
         jmp     echo
end:
         jmp     $

         times   510 - ($-$$) db 0       ;We pad the remaining bytes with 0's.
         dw      0aa55h                  ;Boot key.