Appendix A

ASCII character encoding

``ASCII'' stands for ``American Standard Code for Information Interchange''. The ASCII standard is a seven-bit code published by the United States of America Standards Institute (USASI) in 1968. The ASCII encoding forms the first half of ISO-8859-1 (Latin1) which in turn forms the first page of ISO 10646 (Unicode).

The Scheme 48 procedures char->ascii and ascii->char (section 5.3) give access to the ASCII encoding.

n10	n16		Unicode name	n10	n16		Unicode name
n10	n16		Unicode name	n10	n16		Unicode name
0	0	NUL	null	64	40	@	commercial at
1	1	SOH	start of heading	65	41	A	latin capital letter a
2	2	STX	start of text	66	42	B	latin capital letter b
3	3	ETX	end of text	67	43	C	latin capital letter c
4	4	EOT	end of transmission	68	44	D	latin capital letter d
5	5	ENQ	enquiry	69	45	E	latin capital letter e
6	6	ACK	acknowledge	70	46	F	latin capital letter f
7	7	BEL	bell	71	47	G	latin capital letter g
8	8	BS	backspace	72	48	H	latin capital letter h
9	9	HT	horizontal tabulation	73	49	I	latin capital letter i
10	A	LF	line feed	74	4A	J	latin capital letter j
11	B	VT	vertical tabulation	75	4B	K	latin capital letter k
12	C	FF	form feed	76	4C	L	latin capital letter l
13	D	CR	carriage return	77	4D	M	latin capital letter m
14	E	SO	shift out	78	4E	N	latin capital letter n
15	F	SI	shift in	79	4F	O	latin capital letter o
16	10	DLE	data link escape	80	50	P	latin capital letter p
17	11	DC1	device control one	81	51	Q	latin capital letter q
18	12	DC2	device control two	82	52	R	latin capital letter r
19	13	DC3	device control three	83	53	S	latin capital letter s
20	14	DC4	device control four	84	54	T	latin capital letter t
21	15	NAK	negative acknowledge	85	55	U	latin capital letter u
22	16	SYN	synchronous idle	86	56	V	latin capital letter v
23	17	ETB	end of transmission block	87	57	W	latin capital letter w
24	18	CAN	cancel	88	58	X	latin capital letter x
25	19	EM	end of medium	89	59	Y	latin capital letter y
26	1A	SUB	substitute	90	5A	Z	latin capital letter z
27	1B	ESC	escape	91	5B	[	left square bracket
28	1C	FS	file separator	92	5C	\	reverse solidus
29	1D	GS	group separator	93	5D	]	right square bracket
30	1E	RS	record separator	94	5E	^	circumflex accent
31	1F	US	unit separator	95	5F	_	low line
32	20	SPACE	space	96	60	`	grave accent
33	21	!	exclamation mark	97	61	a	latin small letter a
34	22	"	quotation mark	98	62	b	latin small letter b
35	23	#	number sign	99	63	c	latin small letter c
36	24	$	dollar sign	100	64	d	latin small letter d
37	25	%	percent sign	101	65	e	latin small letter e
38	26	&	ampersand	102	66	f	latin small letter f
39	27	'	apostrophe	103	67	g	latin small letter g
40	28	(	left parenthesis	104	68	h	latin small letter h
41	29	)	right parenthesis	105	69	i	latin small letter i
42	2A	*	asterisk	106	6A	j	latin small letter j
43	2B	+	plus sign	107	6B	k	latin small letter k
44	2C	,	comma	108	6C	l	latin small letter l
45	2D	-	hyphen-minus	109	6D	m	latin small letter m
46	2E	.	full stop	110	6E	n	latin small letter n
47	2F	/	solidus	111	6F	o	latin small letter o
48	30	0	digit zero	112	70	p	latin small letter p
49	31	1	digit one	113	71	q	latin small letter q
50	32	2	digit two	114	72	r	latin small letter r
51	33	3	digit three	115	73	s	latin small letter s
52	34	4	digit four	116	74	t	latin small letter t
53	35	5	digit five	117	75	u	latin small letter u
54	36	6	digit six	118	76	v	latin small letter v
55	37	7	digit seven	119	77	w	latin small letter w
56	38	8	digit eight	120	78	x	latin small letter x
57	39	9	digit nine	121	79	y	latin small letter y
58	3A	:	colon	122	7A	z	latin small letter z
59	3B	;	semicolon	123	7B	{	left curly bracket
60	3C	<	less-than sign	124	7C	|	vertical line
61	3D	=	equals sign	125	7D	}	right curly bracket
62	3E	>	greater-than sign	126	7E	~	tilde
63	3F	?	question mark	127	7F	DEL	delete