ASCII

NAME

DESCRIPTION

The following table contains the 128 ASCII characters.

C program '\X' escapes are noted.

Oct	Dec	Hex	Char		Oct	Dec	Hex	Char
000	0	00	NUL '\0'		100	64	40	@
001	1	01	SOH		101	65	41	A
002	2	02	STX		102	66	42	B
003	3	03	ETX		103	67	43	C
004	4	04	EOT		104	68	44	D
005	5	05	ENQ		105	69	45	E
006	6	06	ACK		106	70	46	F
007	7	07	BEL '\a'		107	71	47	G
010	8	08	BS '\b'		110	72	48	H
011	9	09	HT '\t'		111	73	49	I
012	10	0A	LF '\n'		112	74	4A	J
013	11	0B	VT '\v'		113	75	4B	K
014	12	0C	FF '\f'		114	76	4C	L
015	13	0D	CR '\r'		115	77	4D	M
016	14	0E	SO		116	78	4E	N
017	15	0F	SI		117	79	4F	O
020	16	10	DLE		120	80	50	P
021	17	11	DC1		121	81	51	Q
022	18	12	DC2		122	82	52	R
023	19	13	DC3		123	83	53	S
024	20	14	DC4		124	84	54	T
025	21	15	NAK		125	85	55	U
026	22	16	SYN		126	86	56	V
027	23	17	ETB		127	87	57	W
030	24	18	CAN		130	88	58	X
031	25	19	EM		131	89	59	Y
032	26	1A	SUB		132	90	5A	Z
033	27	1B	ESC		133	91	5B	[
034	28	1C	FS		134	92	5C	\ '\\'
035	29	1D	GS		135	93	5D	]
036	30	1E	RS		136	94	5E	^
037	31	1F	US		137	95	5F	_
040	32	20	SPACE		140	96	60	`
041	33	21	!		141	97	61	a
042	34	22	"		142	98	62	b
043	35	23	#		143	99	63	c
044	36	24	$		144	100	64	d
045	37	25	%		145	101	65	e
046	38	26	&		146	102	66	f
047	39	27	'		147	103	67	g
050	40	28	(		150	104	68	h
051	41	29	)		151	105	69	i
052	42	2A	*		152	106	6A	j
053	43	2B	+		153	107	6B	k
054	44	2C	,		154	108	6C	l
055	45	2D	-		155	109	6D	m
056	46	2E	.		156	110	6E	n
057	47	2F	/		157	111	6F	o
060	48	30	0		160	112	70	p
061	49	31	1		161	113	71	q
062	50	32	2		162	114	72	r
063	51	33	3		163	115	73	s
064	52	34	4		164	116	74	t
065	53	35	5		165	117	75	u
066	54	36	6		166	118	76	v
067	55	37	7		167	119	77	w
070	56	38	8		170	120	78	x
071	57	39	9		171	121	79	y
072	58	3A	:		172	122	7A	z
073	59	3B	;		173	123	7B	{
074	60	3C	<		174	124	7C	|
075	61	3D	=		175	125	7D	}
076	62	3E	>		176	126	7E	~
077	63	3F	?		177	127	7F	DEL

 

HISTORY

On older terminals, the underscore code is displayed as a left arrow, called backarrow, the caret is displayed as an up-arrow and the vertical bar has a hole in the middle.

Uppercase and lowercase characters differ by just one bit and the ASCII character 2 differs from the double quote by just one bit, too. That made it much easier to encode characters mechanically or with a non-microcontroller-based electronic keyboard and that pairing was found on old teletypes.

The ASCII standard was published by the United States of America Standards Institute (USASI) in 1968.  

SEE ALSO

Index

NAME

DESCRIPTION

HISTORY

SEE ALSO