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ASCII stands for American Standard Code for Information Interchange. Computers can only understand numbers, so an ASCII code is the numerical representation of a character such as 'a' or '@' or an action of some sort. ASCII was developed a long time ago and now the non-printing characters are rarely used for their original purpose. Below is the ASCII character table and this includes descriptions of the first 256 characters.

Dez	Oct	Hex	Bin	Ctrl	Cmd	DOS	Mac	Description
0	'000	$00	00000000	^@	NUL	---	---	Null Prompt (End Of C String)
1	'001	$01	00000001	^A	SOH		---	Start Of Heading
2	'002	$02	00000010	^B	STX			Start Of Text
3	'003	$03	00000011	^C	ETX			End Of Text
4	'004	$04	00000100	^D	EOT			End Of Transmission
5	'005	$05	00000101	^E	ENQ			Enquiry
6	'006	$06	00000110	^F	ACK			Acknowledge
7	'007	$07	00000111	^G	BEL			Bell
8	'010	$08	00001000	^H	BS		---	Backspace
9	'011	$09	00001001	^I	HT		---	Horizontal Tab
10	'012	$0A	00001010	^J	LF			Line Feed
11	'013	$0B	00001011	^K	VT			Vertical Tab
12	'014	$0C	00001100	^L	FF			Form Feed
13	'015	$0D	00001101	^M	CR		---	Carriage Return
14	'016	$0E	00001110	^N	SO		---	Shift Out
15	'017	$0F	00001111	^O	SI		---	Shift In
16	'020	$10	00010000	^P	DLE			Data Link Escape
17	'021	$11	00010001	^Q	DC1			Device Control 1 (XON)
18	'022	$12	00010010	^R	DC2			Device Control 2
19	'023	$13	00010011	^S	DC3			Device Control 3 (XOFF)
20	'024	$14	00010100	^T	DC4			Device Control 4
21	'025	$15	00010101	^U	NAK		---	No Acknowledge
22	'026	$16	00010110	^V	SYN		---	Synchronous Idle
23	'027	$17	00010111	^W	ETB			End Transmission Blocks
24	'030	$18	00011000	^X	CAN			Cancel
25	'031	$19	00011001	^Y	EM			End Of Medium
26	'032	$1A	00011010	^Z	SUB			Substitute (End Of Text File)
27	'033	$1B	00011011	^[	ESC			Escape
28	'034	$1C	00011100	^\	FS			File Separator
29	'035	$1D	00011101	^]	GS		---	Group Separator
30	'036	$1E	00011110	^^	RS		---	Record Separator
31	'037	$1F	00011111	^_	US		---	Unit Separator

Dez	Oct	Hex	Bin	DOS/Win/Mac
32	'040	$20	00100000	[Leer]
33	'041	$21	00100001	!
34	'042	$22	00100010	"
35	'043	$23	00100011	#
36	'044	$24	00100100	$
37	'045	$25	00100101	%
38	'046	$26	00100110	&
39	'047	$27	00100111	'
40	'050	$28	00101000	(
41	'051	$29	00101001	)
42	'052	$2A	00101010	*
43	'053	$2B	00101011	+
44	'054	$2C	00101100	,
45	'055	$2D	00101101	-
46	'056	$2E	00101110	.
47	'057	$2F	00101111	/
48	'060	$30	00110000	0
49	'061	$31	00110001	1
50	'062	$32	00110010	2
51	'063	$33	00110011	3
52	'064	$34	00110100	4
53	'065	$35	00110101	5
54	'066	$36	00110110	6
55	'067	$37	00110111	7
56	'070	$38	00111000	8
57	'071	$39	00111001	9
58	'072	$3A	00111010	:
59	'073	$3B	00111011	;
60	'074	$3C	00111100	<
61	'075	$3D	00111101	=
62	'076	$3E	00111110	>
63	'077	$3F	00111111	?
64	'100	$40	01000000	@
65	'101	$41	01000001	A
66	'102	$42	01000010	B
67	'103	$43	01000011	C
68	'104	$44	01000100	D
69	'105	$45	01000101	E
70	'106	$46	01000110	F
71	'107	$47	01000111	G
72	'110	$48	01001000	H
73	'111	$49	01001001	I
74	'112	$4A	01001010	J
75	'113	$4B	01001011	K
76	'114	$4C	01001100	L
77	'115	$4D	01001101	M
78	'116	$4E	01001110	N
79	'117	$4F	01001111	O
80	'120	$50	01010000	P
81	'121	$51	01010001	Q
82	'122	$52	01010010	R
83	'123	$53	01010011	S
84	'124	$54	01010100	T
85	'125	$55	01010101	U
86	'126	$56	01010110	V
87	'127	$57	01010111	W
88	'130	$58	01011000	X
89	'131	$59	01011001	Y
90	'132	$5A	01011010	Z
91	'133	$5B	01011011	[
92	'134	$5C	01011100	\
93	'135	$5D	01011101	]
94	'136	$5E	01011110	^
95	'137	$5F	01011111	_
96	'140	$60	01100000	`
97	'141	$61	01100001	a
98	'142	$62	01100010	b
99	'143	$63	01100011	c
100	'144	$64	01100100	d
101	'145	$65	01100101	e
102	'146	$66	01100110	f
103	'147	$67	01100111	g
104	'150	$68	01101000	h
105	'151	$69	01101001	i
106	'152	$6A	01101010	j
107	'153	$6B	01101011	k
108	'154	$6C	01101100	l
109	'155	$6D	01101101	m
110	'156	$6E	01101110	n
111	'157	$6F	01101111	o
112	'160	$70	01110000	p
113	'161	$71	01110001	q
114	'162	$72	01110010	r
115	'163	$73	01110011	s
116	'164	$74	01110100	t
117	'165	$75	01110101	u
118	'166	$76	01110110	v
119	'167	$77	01110111	w
120	'170	$78	01111000	x
121	'171	$79	01111001	y
122	'172	$7A	01111010	z
123	'173	$7B	01111011	{
124	'174	$7C	01111100	|
125	'175	$7D	01111101	}
126	'176	$7E	01111110	~
127	'177	$7F	01111111

Dez	Oct	Hex	Bin	DOS	Win	Mac
128	'200	$80	10000000	Ç	---	Ä
129	'201	$81	10000001	ü	---	Å
130	'202	$82	10000010	é	---	Ç
131	'203	$83	10000011	â	---	É
132	'204	$84	10000100	ä	---	Ñ
133	'205	$85	10000101	à	---	Ö
134	'206	$86	10000110	å	---	Ü
135	'207	$87	10000111	ç	---	á
136	'210	$88	10001000	ê	---	à
137	'211	$89	10001001	ë	---	â
138	'212	$8A	10001010	è	---	ä
139	'213	$8B	10001011	ï	---	ã
140	'214	$8C	10001100	î	---	å
141	'215	$8D	10001101	ì	---	ç
142	'216	$8E	10001110	Ä	---	é
143	'217	$8F	10001111	Å	---	è
144	'220	$90	10010000	É	---	ê
145	'221	$91	10010001	æ		ë
146	'222	$92	10010010	Æ		í
147	'223	$93	10010011	ô	---	ì
148	'224	$94	10010100	ö	---	î
149	'225	$95	10010101	ò	---	ï
150	'226	$96	10010110	û	---	ñ
151	'227	$97	10010111	ù	---	ó
152	'230	$98	10011000	ÿ	---	ò
153	'231	$99	10011001	Ö	---	ô
154	'232	$9A	10011010	Ü	---	ö
155	'233	$9B	10011011	¢	---	õ
156	'234	$9C	10011100	£	---	ú
157	'235	$9D	10011101	¥	---	ù
158	'236	$9E	10011110		---	û
159	'237	$9F	10011111		---	ü
160	'240	$A0	10100000	á	[Leer]
161	'241	$A1	10100001	í	¡	°
162	'242	$A2	10100010	ó	¢	¢
163	'243	$A3	10100011	ú	£	£
164	'244	$A4	10100100	ñ	¤	§
165	'245	$A5	10100101	Ñ	¥
166	'246	$A6	10100110	ª	¦	¶
167	'247	$A7	10100111	º	§	ß
168	'250	$A8	10101000	¿	¨	®
169	'251	$A9	10101001		©	©
170	'252	$AA	10101010	¬	ª
171	'253	$AB	10101011	½	«	´
172	'254	$AC	10101100	¼	¬	¨
173	'255	$AD	10101101	¡	­
174	'256	$AE	10101110	«	®	Æ
175	'257	$AF	10101111	»	¯	Ø
176	'260	$B0	10110000		°
177	'261	$B1	10110001		±	±
178	'262	$B2	10110010		²
179	'263	$B3	10110011		³
180	'264	$B4	10110100		´	¥
181	'265	$B5	10110101		µ	µ
182	'266	$B6	10110110		¶
183	'267	$B7	10110111		·
184	'270	$B8	10111000		¸
185	'271	$B9	10111001		¹
186	'272	$BA	10111010		º
187	'273	$BB	10111011		»	ª
188	'274	$BC	10111100		¼	º
189	'275	$BD	10111101		½
190	'276	$BE	10111110		¾	æ
191	'277	$BF	10111111		¿	ø
192	'300	$C0	11000000		À	¿
193	'301	$C1	11000001		Á	¡
194	'302	$C2	11000010		Â	¬
195	'303	$C3	11000011		Ã
196	'304	$C4	11000100		Ä
197	'305	$C5	11000101		Å
198	'306	$C6	11000110		Æ
199	'307	$C7	11000111		Ç	«
200	'310	$C8	11001000		È	»
201	'311	$C9	11001001		É
202	'312	$CA	11001010		Ê	[Leer]
203	'313	$CB	11001011		Ë	À
204	'314	$CC	11001100		Ì	Ã
205	'315	$CD	11001101		Í	Õ
206	'316	$CE	11001110		Î
207	'317	$CF	11001111		Ï
208	'320	$D0	11010000		Ð
209	'321	$D1	11010001		Ñ
210	'322	$D2	11010010		Ò
211	'323	$D3	11010011		Ó
212	'324	$D4	11010100		Ô
213	'325	$D5	11010101		Õ
214	'326	$D6	11010110		Ö	÷
215	'327	$D7	11010111		×
216	'330	$D8	11011000		Ø	ÿ
217	'331	$D9	11011001		Ù
218	'332	$DA	11011010		Ú	/
219	'333	$DB	11011011		Û	€
220	'334	$DC	11011100		Ü	<
221	'335	$DD	11011101		Ý	>
222	'336	$DE	11011110		Þ
223	'337	$DF	11011111		ß
224	'340	$E0	11100000		à
225	'341	$E1	11100001		á	·
226	'342	$E2	11100010		â
227	'343	$E3	11100011		ã
228	'344	$E4	11100100		ä
229	'345	$E5	11100101		å	Â
230	'346	$E6	11100110		æ	Ê
231	'347	$E7	11100111		ç	Á
232	'350	$E8	11101000		è	Ë
233	'351	$E9	11101001		é	È
234	'352	$EA	11101010		ê	Í
235	'353	$EB	11101011		ë	Î
236	'354	$EC	11101100		ì	Ï
237	'355	$ED	11101101		í	Ì
238	'356	$EE	11101110		î	Ó
239	'357	$EF	11101111		ï	Ô
240	'360	$F0	11110000		ð
241	'361	$F1	11110001	±	ñ	Ò
242	'362	$F2	11110010		ò	Ú
243	'363	$F3	11110011		ó	Û
244	'364	$F4	11110100		ô	Ù
245	'365	$F5	11110101		õ
246	'366	$F6	11110110	÷	ö
247	'367	$F7	11110111		÷
248	'370	$F8	11111000	°	ø	¯
249	'371	$F9	11111001	·	ù
250	'372	$FA	11111010		ú
251	'373	$FB	11111011		û
252	'374	$FC	11111100		ü
253	'375	$FD	11111101	²	ý
254	'376	$FE	11111110		þ	¸
255	'377	$FF	11111111	---	ÿ