17 lines
400 B
NASM
17 lines
400 B
NASM
_start:
|
|
push ax
|
|
|
|
xor bp, bp ;clear out bp
|
|
mov ah, 1 ;Function 1, check key status.
|
|
int 16h ;Is a key ready?
|
|
jz NO_KEY ;If zf cleared, then no.
|
|
xor ah, ah ;Otherwise, a key is waiting.
|
|
int 16h ;ah -> scancode
|
|
xor al, al
|
|
xchg al, ah ;ax -> scancode
|
|
mov bp, ax ;bp -> scancode, accessible globally
|
|
|
|
|
|
NO_KEY:
|
|
pop ax
|
|
ret
|