[BITS 16] [ORG 0x7C00] jmp far start start: cli mov ax,0x9000 ; Put stack segment at 0x9000 mov ss,ax mov sp,0xffff sti xor ax,ax mov ds,ax mov es,ax mov si,loadingmsg call printmsg loop: jmp loop printmsg: lodsb ; load byte at DS:SI into AL or al,al ; See if its the last character in the string (0) jz printmsg_done ; If so, we're done printing mov ah,0eh ; Use function 0E (put character) mov bx,0009 ; Attribute int 0x10 ; Call BIOS jmp printmsg printmsg_done: ret loadingmsg db 'Hello World!',13,10,13,10 db 'kraz! v0.00.1',0