Intel bootloader

; COMPILE: nasm bootloader.asm -f bin -o bootloader.bin
; RUN: qemu-system-i386 bootloader.bin

[BITS 16]
[ORG 0x7C00]

Bootloader_Entry_Point:
    mov     si, info_text
    call    Print_String
    jmp     $                   ; Loop forever

Print_Character:
    mov     ah, 0x0e
    mov     bh, 0x00
    mov     bl, 0x07
    int     0x10
    ret

Print_String:
    mov     al, [si]
    inc     si
    cmp     al, 0
    je      exit_function
    call    Print_Character
    jmp     Print_String
exit_function:
    ret


info_text   db  'My very own bootloader', 13, 10, 0
TIMES 510 - ($ - $$) db 0       ; Fill unused part of the 512 byte boot block with zeroes
magic_id    dw 0xAA55           ; This ID has to be the last two bytes of the 512 byte boot block