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ASCII table

DEC	HEX	BIN	Char
0	00	0000 0000	NUL
1	01	0000 0001	SOH
2	02	0000 0010	STX
3	03	0000 0011	ETX
4	04	0000 0100	EOT
5	05	0000 0101	ENQ
6	06	0000 0110	ACK
7	07	0000 0111	BEL
8	08	0000 1000	BS
9	09	0000 1001	HT
10	0A	0000 1010	LF
11	0B	0000 1011	VT
12	0C	0000 1100	FF
13	0D	0000 1101	CR
14	0E	0000 1110	SO
15	0F	0000 1111	SI
16	10	0001 0000	DLE
17	11	0001 0001	DC1
18	12	0001 0010	DC2
19	13	0001 0011	DC3
20	14	0001 0100	DC4
21	15	0001 0101	NAK
22	16	0001 0110	SYN
23	17	0001 0111	ETB
24	18	0001 1000	CAN
25	19	0001 1001	EM
26	1A	0001 1010	SUB
27	1B	0001 1011	ESC
28	1C	0001 1100	FS
29	1D	0001 1101	GS
30	1E	0001 1110	RS
31	1F	0001 1111	US
32	20	0010 0000	SP
33	21	0010 0001	!
34	22	0010 0010	"
35	23	0010 0011	#
36	24	0010 0100	$
37	25	0010 0101	%
38	26	0010 0110	&
39	27	0010 0111	'
40	28	0010 1000	(
41	29	0010 1001	)
42	2A	0010 1010	*
43	2B	0010 1011	+
44	2C	0010 1100	,
45	2D	0010 1101	-
46	2E	0010 1110	.
47	2F	0010 1111	/
48	30	0011 0000	0
49	31	0011 0001	1
50	32	0011 0010	2
51	33	0011 0011	3
52	34	0011 0100	4
53	35	0011 0101	5
54	36	0011 0110	6
55	37	0011 0111	7
56	38	0011 1000	8
57	39	0011 1001	9
58	3A	0011 1010	:
59	3B	0011 1011	;
60	3C	0011 1100	<
61	3D	0011 1101	=
62	3E	0011 1110	>
63	3F	0011 1111	?
64	40	0100 0000	@
65	41	0100 0001	A
66	42	0100 0010	B
67	43	0100 0011	C
68	44	0100 0100	D
69	45	0100 0101	E
70	46	0100 0110	F
71	47	0100 0111	G
72	48	0100 1000	H
73	49	0100 1001	I
74	4A	0100 1010	J
75	4B	0100 1011	K
76	4C	0100 1100	L
77	4D	0100 1101	M
78	4E	0100 1110	N
79	4F	0100 1111	O
80	50	0101 0000	P
81	51	0101 0001	Q
82	52	0101 0010	R
83	53	0101 0011	S
84	54	0101 0100	T
85	55	0101 0101	U
86	56	0101 0110	V
87	57	0101 0111	W
88	58	0101 1000	X
89	59	0101 1001	Y
90	5A	0101 1010	Z
91	5B	0101 1011	[
92	5C	0101 1100	\
93	5D	0101 1101	]
94	5E	0101 1110	^
95	5F	0101 1111	_
96	60	0110 0000	`
97	61	0110 0001	a
98	62	0110 0010	b
99	63	0110 0011	c
100	64	0110 0100	d
101	65	0110 0101	e
102	66	0110 0110	f
103	67	0110 0111	g
104	68	0110 1000	h
105	69	0110 1001	i
106	6A	0110 1010	j
107	6B	0110 1011	k
108	6C	0110 1100	l
109	6D	0110 1101	m
110	6E	0110 1110	n
111	6F	0110 1111	o
112	70	0111 0000	p
113	71	0111 0001	q
114	72	0111 0010	r
115	73	0111 0011	s
116	74	0111 0100	t
117	75	0111 0101	u
118	76	0111 0110	v
119	77	0111 0111	w
120	78	0111 1000	x
121	79	0111 1001	y
122	7A	0111 1010	z
123	7B	0111 1011	{
124	7C	0111 1100	\|
125	7D	0111 1101	}
126	7E	0111 1110	~
127	7F	0111 1111	DEL

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What ASCII is

ASCII encodes characters in 7 bits, 0 to 127. 0–31 and 127 are control codes (LF, CR and so on), 32 is space, 48–57 are digits, 65–90 uppercase and 97–122 lowercase letters.

Upper and lower case

Upper and lower case letters differ by 32 (0x20): A is 65 (0x41) and a is 97 (0x61), so flipping bit 5 switches case.