boot.asm

    BITS 16
start:
    mov ax, 07C0h
    mov ax, 288
    mov ss, ax
    mov sp, 4096

    mov ax, 07C0h
    mov ds, ax
    mov si, text_string
    call print_string
    jmp $         ; INFINITE LOOP



print_string:
    mov ax, boot_string
.repeat:
    lodsb
    cmp al, 0
    je .done
    int 10h
    jmp .repeat
.done:
    ret



    times 510-($-$$) db 0
    dw 0xAA55
boot_string    db 'Starting Operating System...', 0