boot_sect_stack.asm

mov ah, 0x0e ; tty mode

mov bp, 0x8000 ; this is an address far away from 0x7c00 so that we don't get overwritten
mov sp, bp ; if the stack is empty then sp points to bp

; LUIGINA
push 'A'
push 'N'
push 'I'
push 'G'
push 'I'
push 'U'
push 'L'

; to show how the stack grows downwards
mov al, [0x7ffe] ; 0x8000 - 2
int 0x10

; however, don't try to access [0x8000] now, because it won't work
; you can only access the stack top so, at this point, only 0x7ffe (look above)
mov al, [0x8000]
int 0x10


; recover our characters using the standard procedure: 'pop'
; We can only pop full words so we need an auxiliary register to manipulate
; the lower byte
pop bx
mov al, bl
int 0x10 ; prints L

pop bx
mov al, bl
int 0x10 ; prints U

pop bx
mov al, bl
int 0x10 ; prints I

pop bx
mov al, bl
int 0x10 ; prints G

pop bx
mov al, bl
int 0x10 ; prints I

pop bx
mov al, bl
int 0x10 ; prints U

pop bx
mov al, bl
int 0x10 ; prints L

; data that has been pop'd from the stack is garbage now
mov al, [0x8000]
int 0x10


jmp $
times 510-($-$$) db 0
dw 0xaa55