BASIC KEY Function

KEY

TYPE: BASIC system function

---

FORMAT: KEY ( keycode )

Action: Returns a logical value (0 = FALSE, !0 = TRUE) when the key indicated by keycode is pressed. Note that keycode is not the CHR code!

• keycode is the key matrix index code of the key to check

Code	Key		Code	Key		Code	Key		Code	Key
0	=		16	9		32	6		48	3
1	BKSP		17	O		33	Y		49	E
2	:		18	K		34	G		50	S
3	Return		19	M		35	V		51	Z
4	;		20	N		36	C		52	Space
5	.		21	J		37	F		53	A
6	Insert		22	CsrLf		38	PgUp		54	Menu
7	Delete		23	CsrDn		39	PgDn		55	Tab
8	-		24	8		40	5		56	2
9	/		25	I		41	T		57	W
10	0		26	7		42	4		58	1
11	P		27	U		43	R		59	Q
12	L		28	H		44	D		60	Shift
13	,		29	B		45	X		61	Ctrl
14	CsrUp		30	Home		46	Pause		62	Alt
15	CrsRt		31	End		47	PrtSc		63	GUI

• Illegal Quantity error results if keycode is not between 0-63.

Examples:

PRINT KEY(3) ...and keep the RETURN key pressed.

Prints -1 because the RETURN key was pressed when evaluated.

PRINT KEY(0) ...with no other key pressed.

Prints 0 because the EQUAL key was NOT pressed when evaluated.

100 REM Check for "w" key
200 if key(57) then print "w"
300 print" "
400 goto 100

Prints the letter "w" whenever the "w" key is pressed, and the letters scroll up the screen.