bits 16     ; we're in 16 bit real mode
org 0xfe000 ; that's where we're loaded

start: ; we jump here after the entry point
mov ax, 0xFF
push ax
pop bx
hlt

; fill until the reset vector
times 4080 - ($ - start) db 0

; entry point
; we shouldn't assume any initial state here
cli

; set up stack at 0:0x7c00
; that's just below where we'll load the boot sector
mov ax, 0
mov ss, ax
mov sp, 0x7c00

; jump over to start
jmp start

; fill the last bytes
times 4096 - ($ - start) db 0