Instruction Machine Codes

In order to help the programmer examine memory when debugging programs, this list provides the assembly language instruction represented by each of the 256 possible instruction code bytes. Where an instruction occupies two bytes, only the first (code) byte is given.

Instruction Machine Codes

Decimal	Octal	Hex	Mnemonic	Parameter	Comment
0	0	0	NOP
1	1	1	Not Used
2	2	2	Not Used
3	3	3	Not Used
4	4	4	Not Used
5	5	5	Not Used
6	6	6	Not Used
7	7	7	Not Used
8	10	8	Not Used
9	11	9	Not Used
10	12	A	Not Used
11	13	B	Not Used
12	14	C	Not Used
13	15	D	Not Used
14	16	E	Not Used
15	17	F	Not Used
16	20	10	JCN	0	CN=0
17	21	11	JCN	1	CN=1
18	22	12	JCN	2	CN=2
19	23	13	JCN	3	CN=3
20	24	14	JCN	4	CN=4
21	25	15	JCN	5	CN=5
22	26	16	JCN	6	CN=6
23	27	17	JCN	7	CN=7
24	30	18	JCN	8	CN=8
25	31	19	JCN	9	CN=9
26	32	1A	JCN	10	CN=10
27	33	1B	JCN	11	CN=11
28	34	1C	JCN	12	CN=12
29	35	1D	JCN	13	CN=13
30	36	1E	JCN	14	CN=14
31	37	1F	JCN	15	CN=15
32	40	20	FIM	0P
33	41	21	SRC	0
34	42	22	FIM	1P
35	43	23	SRC	1
36	44	24	FIM	2P
37	45	25	SRC	2
38	46	26	FIM	3P
39	47	27	SRC	3
40	50	28	FIM	4P
41	51	29	SRC	4
42	52	2A	FIM	5P
43	53	2B	SRC	5
44	54	2C	FIM	6P
45	55	2D	SRC	6
46	56	2E	FIM	7P
47	57	2F	SRC	7
48	60	30	FIN	0
49	61	31	JIN	0
50	62	32	FIN	1
51	63	33	JIN	1
52	64	34	FIN	2
53	65	35	JIN	2
54	66	36	FIN	3
55	67	37	JIN	3
56	70	38	FIN	4
57	71	39	JIN	4
58	72	3A	FIN	5
59	73	3B	JIN	5
60	74	3C	FIN	6
61	75	3D	JIN	6
62	76	3E	FIN	7
63	77	3F	JIN	7
64	100	40	JUN		\({\psi}\)
65	101	41	JUN		\({\psi}\)
66	102	42	JUN		\({\psi}\)
67	103	43	JUN		\({\psi}\)
68	104	44	JUN		\({\psi}\)
69	105	45	JUN		\({\psi}\)
70	106	46	JUN		\({\psi}\)
71	107	47	JUN		\({\psi}\)
72	110	48	JUN		\({\psi}\)
73	111	49	JUN		\({\psi}\)
74	112	4A	JUN		\({\psi}\)
75	113	4B	JUN		\({\psi}\)
76	114	4C	JUN		\({\psi}\)
77	115	4D	JUN		\({\psi}\)
78	116	4E	JUN		\({\psi}\)
79	117	4F	JUN		\({\psi}\)
80	120	50	JMS		\({\psi}\)
81	121	51	JMS		\({\psi}\)
82	122	52	JMS		\({\psi}\)
83	123	53	JMS		\({\psi}\)
84	124	54	JMS		\({\psi}\)
85	125	55	JMS		\({\psi}\)
86	126	56	JMS		\({\psi}\)
87	127	57	JMS		\({\psi}\)
88	130	58	JMS		\({\psi}\)
89	131	59	JMS		\({\psi}\)
90	132	5A	JMS		\({\psi}\)
91	133	5B	JMS		\({\psi}\)
92	134	5C	JMS		\({\psi}\)
93	135	5D	JMS		\({\psi}\)
94	136	5E	JMS		\({\psi}\)
95	137	5F	JMS		\({\psi}\)
96	140	60	INC	0
97	141	61	INC	1
98	142	62	INC	2
99	143	63	INC	3
100	144	64	INC	4
101	145	65	INC	5
102	146	66	INC	6
103	147	67	INC	7
104	150	68	INC	8
105	151	69	INC	9
106	152	6A	INC	10
107	153	6B	INC	11
108	154	6C	INC	12
109	155	6D	INC	13
110	156	6E	INC	14
111	157	6F	INC	15
112	160	70	ISZ	0
113	161	71	ISZ	1
114	162	72	ISZ	2
115	163	73	ISZ	3
116	164	74	ISZ	4
117	165	75	ISZ	5
118	166	76	ISZ	6
119	167	77	ISZ	7
120	170	78	ISZ	8
121	171	79	ISZ	9
122	172	7A	ISZ	10
123	173	7B	ISZ	11
124	174	7C	ISZ	12
125	175	7D	ISZ	13
126	176	7E	ISZ	14
127	177	7F	ISZ	15
128	200	80	ADD	0
129	201	81	ADD	1
130	202	82	ADD	2
131	203	83	ADD	3
132	204	84	ADD	4
133	205	85	ADD	5
134	206	86	ADD	6
135	207	87	ADD	7
136	210	88	ADD	8
137	211	89	ADD	9
138	212	8A	ADD	10
139	213	8B	ADD	11
140	214	8C	ADD	12
141	215	8D	ADD	13
142	216	8E	ADD	14
143	217	8F	ADD	15
144	220	90	SUB	0
145	221	91	SUB	1
146	222	92	SUB	2
147	223	93	SUB	3
148	224	94	SUB	4
149	225	95	SUB	5
150	226	96	SUB	6
151	227	97	SUB	7
152	230	98	SUB	8
153	231	99	SUB	9
154	232	9A	SUB	10
155	233	9B	SUB	11
156	234	9C	SUB	12
157	235	9D	SUB	13
158	236	9E	SUB	14
159	237	9F	SUB	15
160	240	A0	LD
161	241	A1	LD
162	242	A2	LD
163	243	A3	LD
164	244	A4	LD
165	245	A5	LD
166	246	A6	LD
167	247	A7	LD
168	250	A8	LD
169	251	A9	LD
170	252	AA	LD
171	253	AB	LD
172	254	AC	LD
173	255	AD	LD
174	256	AE	LD
175	257	AF	LD
176	260	B0	XCH	0
177	261	B1	XCH	1
178	262	B2	XCH	2
179	263	B3	XCH	3
180	264	B4	XCH	4
181	265	B5	XCH	5
182	266	B6	XCH	6
183	267	B7	XCH	7
184	270	B8	XCH	8
185	271	B9	XCH	9
186	272	BA	XCH	10
187	273	BB	XCH	11
188	274	BC	XCH	12
189	275	BD	XCH	13
190	276	BE	XCH	14
191	277	BF	XCH	15
192	300	C0	BBL	0
193	301	C1	BBL	1
194	302	C2	BBL	2
195	303	C3	BBL	3
196	304	C4	BBL	4
197	305	C5	BBL	5
198	306	C6	BBL	6
199	307	C7	BBL	7
200	310	C8	BBL	8
201	311	C9	BBL	9
202	312	CA	BBL	10
203	313	CB	BBL	11
204	314	CC	BBL	12
205	315	CD	BBL	13
206	316	CE	BBL	14
207	317	CF	BBL	15
208	320	D0	LDM	0
209	321	D1	LDM	1
210	322	D2	LDM	2
211	323	D3	LDM	3
212	324	D4	LDM	4
213	325	D5	LDM	5
214	326	D6	LDM	6
215	327	D7	LDM	7
216	330	D8	LDM	8
217	331	D9	LDM	9
218	332	DA	LDM	10
219	333	DB	LDM	11
220	334	DC	LDM	12
221	335	DD	LDM	13
222	336	DE	LDM	14
223	337	DF	LDM	15
224	340	E0	WRM
225	341	E1	WMP
226	342	E2	WRR
227	343	E3	WPM
228	344	E4	WR0
229	345	E5	WR1
230	346	E6	WR2
231	347	E7	WR3
232	350	E8	SBM
233	351	E9	RDM
234	352	EA	RDR
235	353	EB	ADM
236	354	EC	RD0
237	355	ED	RD1
238	356	EE	RD2
239	357	EF	RD3
240	360	F0	CLB
241	361	F1	CLC
242	362	F2	IAC
243	363	F3	CMC
244	364	F4	CMA
245	365	F5	RAL
246	366	F6	RAR
247	367	F7	TCC
248	370	F8	DAC
249	371	F9	TCS
250	372	FA	STC
251	373	FB	DAA
252	374	FC	KBP
253	375	FD	DCL
254	376	FE	Not Used
255	377	FF	Not Used

\({\psi}\) Second hexadecimal digit is part of the jump address.