extern kb_init
extern keystate
+
+SC_ESC equ 1
+SC_W equ 17
+SC_ENTER equ 28
+SC_A equ 30
+SC_S equ 31
+SC_D equ 32
+SC_SPACE equ 57
+
+ ; carry set if key is pressed
+%macro check_key 1
+ mov ebx, keystate + %1
+ mov al, [ebx]
+ add al, 0xff
+%endmacro