Novell's Networking Primer

Primer Appendix

The table below illustrates the ASCII code set. The second table, ASCII Code-to-Character Conversion, gives the code-to-character mapping.

ASCII Code Set

Bit Settings			7	0	0	0	0	1	1	1	1
			6	0	0	1	1	0	0	1	1
			5	0	1	0	1	0	1	0	1
4	3	2	1	Resulting Codes
0	0	0	0	0	16	32	48	64	80	96	112
0	0	0	1	1	17	33	49	65	81	97	113
0	0	1	0	2	18	34	50	66	82	98	114
0	0	1	1	3	19	35	51	67	83	99	115
0	1	0	0	4	20	36	52	68	84	100	116
0	1	0	1	5	21	37	53	69	85	101	117
0	1	1	0	6	22	38	54	70	86	102	118
0	1	1	1	7	23	39	55	71	87	103	119
1	0	0	0	8	24	40	56	72	88	104	120
1	0	0	1	9	25	41	57	73	89	105	121
1	0	1	0	10	26	42	58	74	90	106	122
1	0	1	1	11	27	43	59	75	91	107	123
1	1	0	0	12	28	44	60	76	92	108	124
1	1	0	1	13	29	45	61	77	93	109	125
1	1	1	0	14	30	46	62	78	94	110	126
1	1	1	1	15	31	47	63	79	95	111	127

In the ASCII coding scheme, information (a numeral, symbol, or alphabetic character) is represented by the value of a data unit called a "byte." Each byte can represent one character. There are eight bits in one byte. Bits, short for binary digits, are the data units actually stored in the computer as either a one or a zero. Computers read stored bytes and interpret them as the codes that represent character-based information.

Sample Byte (Bit Settings)

8 7 6 5 4 3 2 1
1 1 0 0 0 0 0 1 = 65 = letter "A"
0 0 1 1 1 0 0 0 = 56 = number "8"

ASCII Code-to-Character Conversion

In the ASCII coding scheme, information (a number or alphabetic character) is represented by the value of a data unit called a "byte." The following table shows possible byte values and the characters that each value is used to represent.

CODE	CHAR	CODE	CHAR	CODE	CHAR	CODE	CHAR	CODE	CHAR
0	NUL	26	SUB	52	4	78	N	104	h
1	SOH	27	ESC	53	5	79	O	105	i
2	STX	28	FS	54	6	80	P	106	j
3	ETX	29	GS	55	7	81	Q	107	k
4	EOT	30	RS	56	8	82	R	108	l
5	ENQ	31	US	57	9	83	S	109	m
6	ACK	32	SP	58	:	84	T	110	n
7	BEL	33	!	59	;	85	U	111	o
8	BS	34	"	60	<	86	V	112	p
9	HT	35	#	61	=	87	W	113	q
10	LF	36	$	62	>	88	X	114	r
11	VT	37	%	63	?	89	Y	115	s
12	FF	38	&	64	@	90	Z	116	t
13	CR	39	'	65	A	91	[	117	u
14	SO	40	(	66	B	92	\	118	v
15	SI	41	)	67	C	93	]	119	w
16	DLE	42	*	68	D	94	^	120	x
17	DC1	43	+	69	E	95	_	121	y
18	DC2	44	,	70	F	96	'	122	z
19	DC3	45	-	71	G	97	a	123	{
20	DC4	46	.	72	H	98	b	124	|
21	NAK	47	/	73	I	99	c	125	}
22	SYN	48	0	74	J	100	d	126	~
23	ETB	49	1	75	K	101	e	127	DEL
24	CAN	50	2	76	L	102	f
25	EM	51	3	77	M	103	g

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