Key Map

The default keymap allows 1 out of 4 players.

btn(id) function returns true if button is pressed in current frame,
btnp(id) if pressed in current and wasn't pressed in previous frame.

Here's a table that summarizes the ID's to interrogate:

Action	P1 ID	P2 ID	P3 ID	P4 ID
Up	0	8	16	24
Down	1	9	17	25
Left	2	10	18	26
Right	3	11	19	27
A	4	12	20	28
B	5	13	21	29
X	6	14	22	30
Y	7	15	23	31

The default keymapping for Player 1 is:

Action	Key (QWERTY)
Up	Up Arrow
Down	Down Arrow
Left	Left Arrow
Right	Right Arrow
A	Z
B	X
X	A
Y	S