Sinclair ZX80 Character Set

Decimal Code	Hexadecimal Code	Character
0	00	(Space)
1	01	"
2	02	block graphic
3	03	block graphic
4	04	block graphic
5	05	block graphic
6	06	block graphic
7	07	block graphic
8	08	block graphic
9	09	block graphic
10	0A	block graphic
11	0B	block graphic
The ZX80 has 16 (including space and inverse space) 'block graphic' characters which consist of a character square divided into four smaller squares, with every combination of none, one, two, three or four of the small squares 'filled-in', as shown in the top two rows below. The six graphic characters in the bottom row are intended for drawing horizontal bar charts, with the 'chessboard' patterns giving a grey shade.
12	0C	£
13	0D	$
14	0E	:
15	0F	?
16	10	(¹
17	11	)¹
18	12	-¹
19	13	+¹
20	14	*¹
21	15	/¹
22	16	=¹
23	17	>¹
24	18	<¹
25	19	;¹
26	1A	,¹
27	1B	.
28	1C	0
29	1D	1
30	1E	2
31	1F	3
32	20	4
33	21	5
34	22	6
35	23	7
36	24	8
37	25	9
38	26	A
39	27	B
40	28	C
41	29	D
42	2A	E
43	2B	F
44	2C	G
45	2D	H
46	2E	I
47	2F	J
48	30	K
49	31	L
50	32	M
51	33	N
52	34	O
53	35	P
54	36	Q
55	37	R
56	38	S
57	39	T
58	3A	U
59	3B	V
60	3C	W
61	3D	X
62	3E	Y
63	3F	Z
64	40	not used
65	41	not used
66	42	not used
67	43	not used
68	44	not used
69	45	not used
70	46	not used
71	47	not used
72	48	not used
73	49	not used
74	4A	not used
75	4B	not used
76	4C	not used
77	4D	not used
78	4E	not used
79	4F	not used
80	50	not used
81	51	not used
82	52	not used
83	53	not used
84	54	not used
85	55	not used
86	56	not used
87	57	not used
88	58	not used
89	59	not used
90	5A	not used
91	5B	not used
92	5C	not used
93	5D	not used
94	5E	not used
95	5F	not used
96	60	not used
97	61	not used
98	62	not used
99	63	not used
100	64	not used
101	65	not used
102	66	not used
103	67	not used
104	68	not used
105	69	not used
106	6A	not used
107	6B	not used
108	6C	not used
109	6D	not used
110	6E	not used
111	6F	not used
112	70	not used
113	71	not used
114	72	not used
115	73	not used
116	74	not used
117	75	not used
118	76	not used
119	77	not used
120	78	not used
121	79	not used
122	7A	not used
123	7B	not used
124	7C	not used
125	7D	not used
126	7E	not used
127	7F	not used
Character codes 64 to 127 print as ? The true question mark is code 15.
128	80	inverse space
129	81	inverse "
130	82	block graphic
131	83	block graphic
132	84	block graphic
133	85	block graphic
134	86	block graphic
135	87	block graphic
136	88	block graphic
137	89	block graphic
138	8A	block graphic
139	8B	block graphic
See after code 11 for the forms of block graphics
140	8C	inverse £
141	8D	inverse $
142	8E	inverse :
143	8F	inverse ?
144	90	inverse (
145	91	inverse )
146	92	inverse -
147	93	inverse +
148	94	inverse *
149	95	inverse /
150	96	inverse =
151	97	inverse >
152	98	inverse <
153	99	inverse ;
154	9A	inverse ,
155	9B	inverse .
156	9C	inverse 0
157	9D	inverse 1
158	9E	inverse 2
159	9F	inverse 3
160	A0	inverse 4
161	A1	inverse 5
162	A2	inverse 6
163	A3	inverse 7
164	A4	inverse 8
165	A5	inverse 9
166	A6	inverse A
167	A7	inverse B
168	A8	inverse C
169	A9	inverse D
170	AA	inverse E
171	AB	inverse F
172	AC	inverse G
173	AD	inverse H
174	AE	inverse I
175	AF	inverse J
176	B0	inverse K
177	B1	inverse L
178	B2	inverse M
179	B3	inverse N
180	B4	inverse O
181	B5	inverse P
182	B6	inverse Q
183	B7	inverse R
184	B8	inverse S
185	B9	inverse T
186	BA	inverse U
187	BB	inverse V
188	BC	inverse W
189	BD	inverse X
190	BE	inverse Y
191	BF	inverse Z
The ZX80 normally displays black text on a white background. The inverse forms of characters reverse this, i.e. white characters in a black square.
192	C0	not used
193	C1	not used
194	C2	not used
195	C3	not used
196	C4	not used
197	C5	not used
198	C6	not used
199	C7	not used
200	C8	not used
201	C9	not used
202	CA	not used
203	CB	not used
204	CC	not used
205	CD	not used
206	CE	not used
207	CF	not used
208	D0	not used
209	D1	not used
210	D2	not used
211	D3	not used
Character codes 192 to 211 print as ?
212	D4	"¹
213	D5	THEN
214	D6	TO
215	D7	;
216	D8	,
217	D9	)
218	DA	(
219	DB	NOT
220	DC	-
221	DD	+
222	DE	*
223	DF	/
224	E0	AND
225	E1	OR
226	E2	**      The 'raise to a power' operator
227	E3	=
228	E4	>
229	E5	<
The 'less than' and 'greater than' symbols for codes 228 & 229 are shown the wrong way round in Appendix II of the ZX80 manual.
230	E6	LIST
231	E7	RETURN
232	E8	CLS
233	E9	DIM
234	EA	SAVE
235	EB	FOR
236	EC	GO TO
237	ED	POKE
238	EE	INPUT
239	EF	RANDOMISE
240	F0	LET
241	F1	not used      prints as ?
242	F2	not used      prints as ?
243	F3	NEXT
244	F4	PRINT
245	F5	not used      prints as ?
246	F6	NEW
247	F7	RUN
248	F8	STOP
249	F9	CONTINUE
250	FA	IF
251	FB	GO SUB
252	FC	LOAD
253	FD	CLEAR
254	FE	REM
255	FF	not used      prints as ?
Most of the character codes from 213 to 255 are the BASIC keywords. They are stored within the program as a single byte but in listings they are expanded to full words, including a space before and after as necessary to improve readability. The system of storing BASIC's words is used because of the very small memory capacity of the unexpanded ZX80. 'PRINT ' would normally take up six bytes whereas character 244 is only one byte. Strangely though there are eight BASIC functions which are not assigned single-character codes. These are CHR$, STR$, TL$, PEEK, CODE, RND, USR & ABS, and must be typed in full.
Note: Characters marked ¹ cannot be typed from the keyboard. E.g. character 212 will display as a double quote when printed via its code, but the double quote obtained from Shift Y has code 1. Similarly all characters with codes from 64 to 211 cannot be obtained from the keyboard. Reverse video letters can only be printed using the CHR$ function and their code.

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