mirror of
https://github.com/cfenollosa/os-tutorial.git
synced 2024-10-27 20:34:19 +00:00
28 lines
493 B
NASM
28 lines
493 B
NASM
mov ah, 0x0e ; tty
|
|
|
|
mov al, [the_secret]
|
|
int 0x10 ; we already saw this doesn't work, right?
|
|
|
|
mov bx, 0x7c0 ; remember, the segment is automatically <<4 for you
|
|
mov ds, bx
|
|
; WARNING: from now on all memory references will be offset by 'ds' implicitly
|
|
mov al, [the_secret]
|
|
int 0x10
|
|
|
|
mov al, [es:the_secret]
|
|
int 0x10 ; doesn't look right... isn't 'es' currently 0x000?
|
|
|
|
mov bx, 0x7c0
|
|
mov es, bx
|
|
mov al, [es:the_secret]
|
|
int 0x10
|
|
|
|
|
|
jmp $
|
|
|
|
the_secret:
|
|
db "X"
|
|
|
|
times 510 - ($-$$) db 0
|
|
dw 0xaa55
|