ramcard.sch@ 8e213be

main

Last change on this file since 8e213be was 8e213be, checked in by PulkoMandy <pulkomandy@…>, 3 years ago

Gemini: schematics with ASIC unlock handling

Add a second GAL and a 8bit comparator to manage the ASIC unlocking

Property mode set to 100644

File size: 20.5 KB

Line
1	EESchema Schematic File Version 4
2	EELAYER 30 0
3	EELAYER END
4	$Descr User 10000 9054
5	encoding utf-8
6	Sheet 1 1
7	Title "Gemini 2020"
8	Date "2020-11-17"
9	Rev "1.0"
10	Comp "PulkoTronics"
11	Comment1 "2MB RAM expansion for Amstrad CPC 6128/Plus"
12	Comment2 ""
13	Comment3 ""
14	Comment4 ""
15	$EndDescr
16	Wire Wire Line
17	1050 2050 850 2050
18	Wire Wire Line
19	1050 1850 850 1850
20	Wire Wire Line
21	1550 2750 1700 2750
22	Wire Wire Line
23	1550 2650 1700 2650
24	Wire Wire Line
25	1550 2550 1700 2550
26	Wire Wire Line
27	1550 2450 1700 2450
28	Wire Wire Line
29	1550 2350 1700 2350
30	Wire Wire Line
31	1550 2250 1700 2250
32	Wire Wire Line
33	1550 1650 1700 1650
34	Wire Wire Line
35	1550 1450 1700 1450
36	Wire Wire Line
37	1550 1250 1700 1250
38	Wire Wire Line
39	1550 1050 1700 1050
40	Wire Wire Line
41	1550 1950 1850 1950
42	Wire Wire Line
43	1550 1750 1850 1750
44	Wire Wire Line
45	1550 3150 1700 3150
46	Wire Wire Line
47	1550 2950 1700 2950
48	Wire Wire Line
49	1050 850 850 850
50	Wire Wire Line
51	1050 2550 850 2550
52	Wire Wire Line
53	1050 2750 850 2750
54	Wire Wire Line
55	1050 3050 850 3050
56	Wire Wire Line
57	800 3350 800 3250
58	Wire Wire Line
59	800 3250 1050 3250
60	Wire Wire Line
61	800 2350 1050 2350
62	Wire Wire Line
63	800 2450 1050 2450
64	Wire Wire Line
65	1050 3150 850 3150
66	Wire Wire Line
67	1050 2850 850 2850
68	Wire Wire Line
69	1050 2650 850 2650
70	Wire Wire Line
71	1050 2250 850 2250
72	Wire Wire Line
73	1550 850 1700 850
74	Wire Wire Line
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76	Wire Wire Line
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78	Wire Wire Line
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80	Wire Wire Line
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82	Wire Wire Line
83	1550 2050 1850 2050
84	Wire Wire Line
85	1550 950 1700 950
86	Wire Wire Line
87	1550 1150 1700 1150
88	Wire Wire Line
89	1550 1350 1700 1350
90	Wire Wire Line
91	1550 1550 1700 1550
92	Wire Wire Line
93	1050 950 900 950
94	Wire Wire Line
95	1050 1050 900 1050
96	Wire Wire Line
97	1050 1150 900 1150
98	Wire Wire Line
99	1050 1250 900 1250
100	Wire Wire Line
101	1050 1350 900 1350
102	Wire Wire Line
103	1050 1450 900 1450
104	Wire Wire Line
105	1050 1550 900 1550
106	Wire Wire Line
107	1050 1650 900 1650
108	Wire Wire Line
109	850 2150 1050 2150
110	Wire Wire Line
111	1550 2850 1750 2850
112	Wire Wire Line
113	1550 2150 1700 2150
114	Wire Wire Line
115	1050 1750 850 1750
116	Wire Wire Line
117	1050 1950 850 1950
118	Text GLabel 1700 2150 2 60 Output ~ 0
119	MREQ
120	NoConn ~ 1700 2650
121	NoConn ~ 1700 2550
122	NoConn ~ 1700 2450
123	NoConn ~ 1700 2250
124	$Comp
125	L power:VCC #PWR013
126	U 1 1 4DBBEA82
127	P 850 2150
128	F 0 "#PWR013" H 850 2250 30 0001 C CNN
129	F 1 "VCC" H 850 2250 30 0000 C CNN
130	F 2 "" H 850 2150 50 0001 C CNN
131	F 3 "" H 850 2150 50 0001 C CNN
132	1 850 2150
133	0 -1 -1 0
134	$EndComp
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136	A15
137	Text Label 1700 950 0 60 ~ 0
138	A14
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140	A13
141	Text Label 1700 1050 0 60 ~ 0
142	A12
143	Text Label 900 1150 0 60 ~ 0
144	A11
145	Text Label 1700 1150 0 60 ~ 0
146	A10
147	Text Label 900 1250 0 60 ~ 0
148	A9
149	Text Label 1700 1250 0 60 ~ 0
150	A8
151	Text Label 900 1350 0 60 ~ 0
152	A7
153	Text Label 1700 1350 0 60 ~ 0
154	A6
155	Text Label 900 1450 0 60 ~ 0
156	A5
157	Text Label 1700 1450 0 60 ~ 0
158	A4
159	Text Label 900 1550 0 60 ~ 0
160	A3
161	Text Label 1700 1550 0 60 ~ 0
162	A2
163	Text Label 900 1650 0 60 ~ 0
164	A1
165	Text Label 1700 1650 0 60 ~ 0
166	A0
167	Text Label 850 1750 0 60 ~ 0
168	D7
169	Text Label 850 1850 0 60 ~ 0
170	D5
171	Text Label 850 1950 0 60 ~ 0
172	D3
173	Text Label 850 2050 0 60 ~ 0
174	D1
175	Text Label 1700 1750 0 60 ~ 0
176	D6
177	Text Label 1700 1850 0 60 ~ 0
178	D4
179	Text Label 1700 1950 0 60 ~ 0
180	D2
181	Text Label 1700 2050 0 60 ~ 0
182	D0
183	NoConn ~ 1700 3050
184	NoConn ~ 1700 3150
185	NoConn ~ 1700 3250
186	NoConn ~ 850 850
187	NoConn ~ 850 2250
188	NoConn ~ 850 2550
189	NoConn ~ 850 2650
190	NoConn ~ 850 2750
191	NoConn ~ 850 2950
192	NoConn ~ 850 3150
193	Text Notes 2060 1250 1 60 ~ 0
194	\ncpc connector
195	Text GLabel 800 2450 0 60 Output ~ 0
196	WR
197	Text GLabel 800 2350 0 60 Output ~ 0
198	IORQ
199	Wire Wire Line
200	1700 850 1700 650
201	Wire Wire Line
202	1700 650 1600 650
203	NoConn ~ 1700 2350
204	Text GLabel 1700 2950 2 60 Output ~ 0
205	RAMRD
206	$Comp
207	L 74xx:74LS574 U2
208	U 1 1 5FB3A5F5
209	P 4200 3700
210	F 0 "U2" H 4200 4678 50 0000 C CNN
211	F 1 "74LS574" H 4400 4400 50 0000 C CNN
212	F 2 "Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm" H 4200 3700 50 0001 C CNN
213	F 3 "http://www.ti.com/lit/gpn/sn74LS574" H 4200 3700 50 0001 C CNN
214	1 4200 3700
215	1 0 0 -1
216	$EndComp
217	Text Label 7350 1950 2 50 ~ 0
218	D0
219	Text Label 7350 2050 2 50 ~ 0
220	D1
221	Text Label 7350 2350 2 50 ~ 0
222	D2
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224	D3
225	Text Label 8850 2550 0 50 ~ 0
226	D4
227	Text Label 8850 2450 0 50 ~ 0
228	D5
229	Text Label 8850 2150 0 50 ~ 0
230	D6
231	Text Label 8850 2050 0 50 ~ 0
232	D7
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234	A0
235	Text Label 7350 1650 2 50 ~ 0
236	A1
237	Text Label 7350 1550 2 50 ~ 0
238	A2
239	Text Label 7350 1450 2 50 ~ 0
240	A3
241	Text Label 7350 1350 2 50 ~ 0
242	A4
243	Text Label 8850 1450 0 50 ~ 0
244	A5
245	Text Label 8850 1550 0 50 ~ 0
246	A6
247	Text Label 8850 1650 0 50 ~ 0
248	A7
249	Text Label 8850 1950 0 50 ~ 0
250	A8
251	Text Label 8850 2650 0 50 ~ 0
252	A9
253	Text Label 8850 2750 0 50 ~ 0
254	A10
255	Text Label 8850 2850 0 50 ~ 0
256	A11
257	Text Label 8850 2950 0 50 ~ 0
258	A12
259	Text Label 8850 3050 0 50 ~ 0
260	A13
261	Text Label 8850 3150 0 50 ~ 0
262	XA14
263	Text GLabel 8950 1750 2 60 Output ~ 0
264	RAMRD
265	Text Label 4700 3900 0 50 ~ 0
266	XA16
267	Text Label 4700 3800 0 50 ~ 0
268	XA17
269	Text Label 4700 3700 0 50 ~ 0
270	XA18
271	Text Label 4700 3600 0 50 ~ 0
272	XA19
273	Text Label 4700 3500 0 50 ~ 0
274	XA20
275	Text Label 3700 3700 2 50 ~ 0
276	D5
277	Text Label 3700 3600 2 50 ~ 0
278	D4
279	Text Label 3700 3500 2 50 ~ 0
280	D3
281	Text Label 2750 3700 2 50 ~ 0
282	A7
283	Text Label 2750 4250 2 50 ~ 0
284	A8
285	Text Label 3700 4100 2 50 ~ 0
286	MMR
287	Text Label 4300 1200 0 50 ~ 0
288	MMR
289	Text Label 2700 2100 2 50 ~ 0
290	A15
291	Text Label 2700 2000 2 50 ~ 0
292	A14
293	Text Label 4300 1400 0 50 ~ 0
294	XA14
295	Text Label 4300 1500 0 50 ~ 0
296	XA15
297	Text Label 4300 1600 0 50 ~ 0
298	RAMDIS
299	Text Label 3700 3200 2 50 ~ 0
300	D0
301	Text Label 3700 3300 2 50 ~ 0
302	D1
303	Text Label 3700 3400 2 50 ~ 0
304	D2
305	Text Label 2700 1300 2 50 ~ 0
306	D6
307	Text Label 2700 1200 2 50 ~ 0
308	D7
309	Text Label 4700 3200 0 50 ~ 0
310	XD0
311	Text Label 4700 3300 0 50 ~ 0
312	XD1
313	Text Label 4700 3400 0 50 ~ 0
314	XD2
315	Text Label 2700 1900 2 50 ~ 0
316	XD0
317	Text Label 2700 1800 2 50 ~ 0
318	XD1
319	Text Label 2700 1700 2 50 ~ 0
320	XD2
321	Text Label 7350 3150 2 50 ~ 0
322	XA15
323	Text Label 7350 3050 2 50 ~ 0
324	XA16
325	Text Label 7350 2950 2 50 ~ 0
326	XA17
327	Text Label 7350 2850 2 50 ~ 0
328	XA18
329	Text Label 7350 2650 2 50 ~ 0
330	RAMWR
331	Text Label 2700 1400 2 50 ~ 0
332	D5
333	Text Label 2700 1500 2 50 ~ 0
334	D4
335	Text Label 2700 1600 2 50 ~ 0
336	D3
337	Text Notes 4600 1100 0 50 ~ 0
338	MMR = IORQ + WR + A15 + !A14 + !D6 + !D7
339	Text Label 8850 1850 0 50 ~ 0
340	RAMDIS
341	Text Notes 4600 1800 0 50 ~ 0
342	XA14 = A14 * !XD2 + XD0 * XD2
343	Text Notes 4600 2000 0 50 ~ 0
344	XA15 = A15 * !XD2 + XD1 * XD2\nCRTC = IORQ + WR + A14
345	Text Notes 4600 2300 0 50 ~ 0
346	RAMDIS = (!XD2 * XD0 * A15 * A14)\n + (!XD2 * XD1 * !XD0)\n + (XD2 * !A15 * A14)
347	Text Notes 4600 1450 0 50 ~ 0
348	RMR2 = (UNLOCK * !IORQ * !WR * !A15 * A14 * D7 * !D6 * D5)\nASIC.R = RMR2 * (D4 * D3) * RESET\n + !RMR2 * ASIC * RESET
349	Text Label 7350 1850 2 50 ~ 0
350	MREQ
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352	L power:VCC #PWR05
353	U 1 1 5FB4DD31
354	P 4200 2900
355	F 0 "#PWR05" H 4200 3000 30 0001 C CNN
356	F 1 "VCC" H 4200 3000 30 0000 C CNN
357	F 2 "" H 4200 2900 50 0001 C CNN
358	F 3 "" H 4200 2900 50 0001 C CNN
359	1 4200 2900
360	1 0 0 -1
361	$EndComp
362	$Comp
363	L power:VCC #PWR03
364	U 1 1 5FB4DD4E
365	P 4300 1000
366	F 0 "#PWR03" H 4300 1100 30 0001 C CNN
367	F 1 "VCC" H 4300 1100 30 0000 C CNN
368	F 2 "" H 4300 1000 50 0001 C CNN
369	F 3 "" H 4300 1000 50 0001 C CNN
370	1 4300 1000
371	1 0 0 -1
372	$EndComp
373	$Comp
374	L power:VCC #PWR07
375	U 1 1 5FB4DD65
376	P 8100 800
377	F 0 "#PWR07" H 8100 900 30 0001 C CNN
378	F 1 "VCC" H 8100 900 30 0000 C CNN
379	F 2 "" H 8100 800 50 0001 C CNN
380	F 3 "" H 8100 800 50 0001 C CNN
381	1 8100 800
382	1 0 0 -1
383	$EndComp
384	$Comp
385	L power:VCC #PWR01
386	U 1 1 5FB4DE9C
387	P 2900 6150
388	F 0 "#PWR01" H 2900 6250 30 0001 C CNN
389	F 1 "VCC" H 2900 6250 30 0000 C CNN
390	F 2 "" H 2900 6150 50 0001 C CNN
391	F 3 "" H 2900 6150 50 0001 C CNN
392	1 2900 6150
393	1 0 0 -1
394	$EndComp
395	$Comp
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398	P 1700 6300
399	F 0 "C1" H 1815 6346 50 0000 L CNN
400	F 1 "C" H 1815 6255 50 0000 L CNN
401	F 2 "Capacitors_SMD:C_1206" H 1738 6150 50 0001 C CNN
402	F 3 "~" H 1700 6300 50 0001 C CNN
403	1 1700 6300
404	1 0 0 -1
405	$EndComp
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407	L Device:C C2
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409	P 2100 6300
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413	F 3 "~" H 2100 6300 50 0001 C CNN
414	1 2100 6300
415	1 0 0 -1
416	$EndComp
417	$Comp
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420	P 2550 6300
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422	F 1 "C" H 2665 6255 50 0000 L CNN
423	F 2 "Capacitors_SMD:C_1206" H 2588 6150 50 0001 C CNN
424	F 3 "~" H 2550 6300 50 0001 C CNN
425	1 2550 6300
426	1 0 0 -1
427	$EndComp
428	$Comp
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433	F 1 "CP" H 3468 6255 50 0000 L CNN
434	F 2 "Capacitor_THT:CP_Radial_D5.0mm_P2.50mm" H 3388 6150 50 0001 C CNN
435	F 3 "~" H 3350 6300 50 0001 C CNN
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449	Connection ~ 2100 6450
450	Connection ~ 2550 6450
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455	F 0 "U4" H 8100 3515 50 0000 C CNN
456	F 1 "LY6220488" H 8100 3424 50 0000 C CNN
457	F 2 "Package_SO:TSOP-II-44_10.16x18.41mm_P0.8mm" H 8100 2250 50 0001 C CNN
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468	Text Label 2700 1100 2 50 ~ 0
469	IORQ
470	Text Label 4300 2100 0 50 ~ 0
471	WR
472	Text Notes 4600 1600 0 50 ~ 0
473	RAMWR = WR + (ASIC * !A15 * A14)
474	Text Label 4300 1300 0 50 ~ 0
475	RAMWR
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505	Wire Wire Line
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520	Wire Wire Line
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522	Wire Wire Line
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542	Wire Wire Line
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544	Connection ~ 2900 6450
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553	F 2 "Housings_SOIC:SOIC-24W_7.5x15.4mm_Pitch1.27mm" H 3500 1340 60 0001 C CNN
554	F 3 "" H 2700 1100 60 0000 C CNN
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558	Text Label 4300 1700 0 50 ~ 0
559	UNLOCK
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565	F 1 "C" H 1465 6255 50 0000 L CNN
566	F 2 "Capacitors_SMD:C_1206" H 1388 6150 50 0001 C CNN
567	F 3 "~" H 1350 6300 50 0001 C CNN
568	1 1350 6300
569	1 0 0 -1
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571	$Comp
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573	U 1 1 61B5E739
574	P 950 6300
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576	F 1 "C" H 1065 6255 50 0000 L CNN
577	F 2 "Capacitors_SMD:C_1206" H 988 6150 50 0001 C CNN
578	F 3 "~" H 950 6300 50 0001 C CNN
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580	1 0 0 -1
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590	Wire Wire Line
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592	Connection ~ 1700 6450
593	Connection ~ 1350 6450
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598	F 0 "#PWR014" H 8100 3200 50 0001 C CNN
599	F 1 "GND" H 8105 3277 50 0000 C CNN
600	F 2 "" H 8100 3450 50 0001 C CNN
601	F 3 "" H 8100 3450 50 0001 C CNN
602	1 8100 3450
603	1 0 0 -1
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634	F 3 "" H 2900 6500 50 0001 C CNN
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644	F 2 "" H 800 3350 50 0001 C CNN
645	F 3 "" H 800 3350 50 0001 C CNN
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647	1 0 0 -1
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655	F 2 "" H 1600 650 50 0001 C CNN
656	F 3 "" H 1600 650 50 0001 C CNN
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667	F 3 "~" H 1250 2050 50 0001 C CNN
668	1 1250 2050
669	1 0 0 -1
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677	F 2 "" H 2700 2300 50 0001 C CNN
678	F 3 "" H 2700 2300 50 0001 C CNN
679	1 2700 2300
680	1 0 0 -1
681	$EndComp
682	$Comp
683	L Switch:SW_DPDT_x2 SW1
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686	F 0 "SW1" H 2950 3475 50 0000 C CNN
687	F 1 "SW_DPDT_x2" H 2950 3566 50 0000 C CNN
688	F 2 "Buttons_Switches_ThroughHole:SW_CuK_JS202011CQN_DPDT_Straight" H 2950 3800 50 0001 C CNN
689	F 3 "~" H 2950 3800 50 0001 C CNN
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691	-1 0 0 1
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693	$Comp
694	L Switch:SW_DPDT_x2 SW1
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700	F 3 "~" H 2950 4350 50 0001 C CNN
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702	-1 0 0 1
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704	Wire Wire Line
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706	Wire Wire Line
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710	2550 4450 2550 4600
711	Wire Wire Line
712	3150 4350 3450 4350
713	Wire Wire Line
714	3450 3900 3450 4350
715	Text Label 4300 1800 0 50 ~ 0
716	ASIC
717	Text Label 4300 2000 0 50 ~ 0
718	CRTC
719	Connection ~ 7500 4050
720	$Comp
721	L power:VCC #PWR012
722	U 1 1 61B91779
723	P 7500 4050
724	F 0 "#PWR012" H 7500 4150 30 0001 C CNN
725	F 1 "VCC" H 7500 4150 30 0000 C CNN
726	F 2 "" H 7500 4050 50 0001 C CNN
727	F 3 "" H 7500 4050 50 0001 C CNN
728	1 7500 4050
729	1 0 0 -1
730	$EndComp
731	Connection ~ 5600 6350
732	$Comp
733	L power:GND #PWR011
734	U 1 1 61B9147E
735	P 5600 6350
736	F 0 "#PWR011" H 5600 6100 50 0001 C CNN
737	F 1 "GND" H 5605 6177 50 0000 C CNN
738	F 2 "" H 5600 6350 50 0001 C CNN
739	F 3 "" H 5600 6350 50 0001 C CNN
740	1 5600 6350
741	1 0 0 -1
742	$EndComp
743	Wire Wire Line
744	7200 6350 8000 6350
745	Connection ~ 7200 6350
746	Wire Wire Line
747	7200 5150 7200 6350
748	Wire Wire Line
749	8000 6350 8500 6350
750	Connection ~ 8000 6350
751	Wire Wire Line
752	8000 6050 8000 6350
753	Wire Wire Line
754	5600 6350 7200 6350
755	Wire Wire Line
756	5600 5150 5600 6350
757	Wire Wire Line
758	7200 4050 7500 4050
759	Text Label 5300 4450 0 50 ~ 0
760	A9
761	Text Label 5300 4350 0 50 ~ 0
762	A8
763	Text Label 5300 4150 0 50 ~ 0
764	CRTC
765	Text Label 5300 4050 0 50 ~ 0
766	CLKIN
767	Wire Wire Line
768	7200 4550 8000 4550
769	Wire Wire Line
770	7200 4450 8000 4450
771	Wire Wire Line
772	7200 4350 8000 4350
773	Text Label 5300 4250 0 50 ~ 0
774	NCO
775	Text Label 7200 4250 0 50 ~ 0
776	UNLOCK
777	Wire Wire Line
778	5300 4650 5600 4650
779	Wire Wire Line
780	5300 4250 5600 4250
781	$Comp
782	L ATF22v10:ATF22V10C-10SU U3
783	U 1 1 6192C385
784	P 5600 4050
785	F 0 "U3" H 6400 4437 60 0000 C CNN
786	F 1 "ATF22V10C-10SU" H 6400 4331 60 0000 C CNN
787	F 2 "Housings_SOIC:SOIC-24W_7.5x15.4mm_Pitch1.27mm" H 6400 4290 60 0001 C CNN
788	F 3 "" H 5600 4050 60 0000 C CNN
789	1 5600 4050
790	1 0 0 -1
791	$EndComp
792	Text Label 5300 4650 0 50 ~ 0
793	RESET
794	Wire Wire Line
795	7850 5850 8000 5850
796	Wire Wire Line
797	7850 5750 8000 5750
798	Wire Wire Line
799	7850 5650 8000 5650
800	Wire Wire Line
801	7850 5550 8000 5550
802	Wire Wire Line
803	7850 5450 8000 5450
804	Wire Wire Line
805	7850 5350 8000 5350
806	Wire Wire Line
807	7850 5250 8000 5250
808	Wire Wire Line
809	7850 5150 8000 5150
810	Text Label 7850 5150 0 50 ~ 0
811	D7
812	Text Label 7850 5250 0 50 ~ 0
813	D6
814	Text Label 7850 5350 0 50 ~ 0
815	D5
816	Text Label 7850 5450 0 50 ~ 0
817	D4
818	Text Label 7850 5850 0 50 ~ 0
819	D3
820	Text Label 7850 5750 0 50 ~ 0
821	D2
822	Text Label 7850 5650 0 50 ~ 0
823	D1
824	Text Label 7850 5550 0 50 ~ 0
825	D0
826	Text Label 7600 4250 0 50 ~ 0
827	PRBS7
828	Text Label 7600 4350 0 50 ~ 0
829	PRBS6
830	Text Label 7600 4450 0 50 ~ 0
831	PRBS5
832	Text Label 7600 4550 0 50 ~ 0
833	PRBS4
834	Text Label 7200 4950 0 50 ~ 0
835	PRBS0
836	Text Label 7200 4850 0 50 ~ 0
837	PRBS1
838	Text Label 7200 4750 0 50 ~ 0
839	PRBS2
840	Text Label 7200 4650 0 50 ~ 0
841	PRBS3
842	Wire Wire Line
843	7500 4050 8300 4050
844	Wire Wire Line
845	7750 4950 8000 4950
846	Wire Wire Line
847	7750 4850 8000 4850
848	Wire Wire Line
849	7750 4750 8000 4750
850	Wire Wire Line
851	7750 4650 8000 4650
852	Text Label 7750 4950 0 50 ~ 0
853	PRBS3
854	Text Label 7750 4850 0 50 ~ 0
855	PRBS2
856	Text Label 7750 4750 0 50 ~ 0
857	PRBS1
858	Text Label 7750 4650 0 50 ~ 0
859	PRBS0
860	Text Label 9000 4250 0 50 ~ 0
861	NCO
862	Wire Wire Line
863	8300 4050 8300 3950
864	Wire Wire Line
865	8300 3950 8500 3950
866	$Comp
867	L 74xx:74LS688 U5
868	U 1 1 616423BA
869	P 8500 5150
870	F 0 "U5" H 9044 5196 50 0000 L CNN
871	F 1 "74LS688" H 9044 5105 50 0000 L CNN
872	F 2 "Housings_SOIC:SOIC-20W_7.5x12.8mm_Pitch1.27mm" H 8500 5150 50 0001 C CNN
873	F 3 "http://www.ti.com/lit/gpn/sn74LS688" H 8500 5150 50 0001 C CNN
874	1 8500 5150
875	1 0 0 -1
876	$EndComp
877	Text Label 4300 1900 0 50 ~ 0
878	RMR2
879	Wire Wire Line
880	5300 4150 5600 4150
881	Text Notes 650 5950 0 50 ~ 0
882	STATE13 = !(PRBS0 * !PRBS1 * PRBS2 * PRBS3 * !PRBS4 * !PRBS5 * PRBS6 * PRBS7)\nUNLOCK.R = (UNLOCK * STATE13)\n + (!UNLOCK * !PRBS0 * PRBS1 * PRBS2 * PRBS3 * !PRBS4 * PRBS5 * PRBS6 * PRBS7)\n\nPRBS0.R = PRBS1 + NCO\nPRBS1.R = PRBS2 + NCO\nPRBS2.R = PRBS3 + NCO\nPRBS3.R = (PRBS0* !PRBS1) + (!PRBS0 * PRBS1) + NCO\nPRBS4.R = PRBS5 + NCO\nPRBS5.R = PRBS6 + NCO\nPRBS6.R = PRBS7 + NCO\nPRBS7.R = (PRBS4* !PRBS7) + (!PRBS4 * PRBS7) + NCO\n\nCLKOUT = CRTC + A9 + A8\nAR=!RESET
883	Wire Wire Line
884	5300 4050 5600 4050
885	Wire Wire Line
886	7200 5050 6400 5050
887	Wire Wire Line
888	6400 5050 6400 4050
889	Wire Wire Line
890	6400 4050 5600 4050
891	Connection ~ 5600 4050
892	Wire Wire Line
893	5300 4350 5600 4350
894	Wire Wire Line
895	5300 4450 5600 4450
896	Text Label 7200 5050 0 50 ~ 0
897	CLKOUT
898	Wire Wire Line
899	8000 4250 7600 4250
900	Wire Wire Line
901	7200 4150 7600 4150
902	Wire Wire Line
903	7600 4150 7600 4250
904	$Comp
905	L Device:LED D1
906	U 1 1 61E50A5C
907	P 5750 2800
908	F 0 "D1" H 5743 3017 50 0000 C CNN
909	F 1 "LED" H 5743 2926 50 0000 C CNN
910	F 2 "LEDs:LED_D5.0mm" H 5750 2800 50 0001 C CNN
911	F 3 "~" H 5750 2800 50 0001 C CNN
912	1 5750 2800
913	1 0 0 -1
914	$EndComp
915	$Comp
916	L Device:LED D2
917	U 1 1 61E511A8
918	P 5750 3200
919	F 0 "D2" H 5743 3417 50 0000 C CNN
920	F 1 "LED" H 5743 3326 50 0000 C CNN
921	F 2 "LEDs:LED_D5.0mm" H 5750 3200 50 0001 C CNN
922	F 3 "~" H 5750 3200 50 0001 C CNN
923	1 5750 3200
924	1 0 0 -1
925	$EndComp
926	$Comp
927	L Device:R R1
928	U 1 1 61E51890
929	P 6050 2800
930	F 0 "R1" V 5843 2800 50 0000 C CNN
931	F 1 "R" V 5934 2800 50 0000 C CNN
932	F 2 "Resistors_SMD:R_0805" V 5980 2800 50 0001 C CNN
933	F 3 "~" H 6050 2800 50 0001 C CNN
934	1 6050 2800
935	0 1 1 0
936	$EndComp
937	$Comp
938	L Device:R R2
939	U 1 1 61E51CEA
940	P 6050 3200
941	F 0 "R2" V 5843 3200 50 0000 C CNN
942	F 1 "R" V 5934 3200 50 0000 C CNN
943	F 2 "Resistors_SMD:R_0805" V 5980 3200 50 0001 C CNN
944	F 3 "~" H 6050 3200 50 0001 C CNN
945	1 6050 3200
946	0 1 1 0
947	$EndComp
948	Wire Wire Line
949	6200 3200 6200 2800
950	Text Label 5600 2800 2 50 ~ 0
951	UNLOCK
952	Text Label 5600 3200 2 50 ~ 0
953	ASIC
954	$Comp
955	L power:GND #PWR0101
956	U 1 1 61E5800A
957	P 6200 3200
958	F 0 "#PWR0101" H 6200 2950 50 0001 C CNN
959	F 1 "GND" H 6205 3027 50 0000 C CNN
960	F 2 "" H 6200 3200 50 0001 C CNN
961	F 3 "" H 6200 3200 50 0001 C CNN
962	1 6200 3200
963	1 0 0 -1
964	$EndComp
965	Connection ~ 6200 3200
966	$EndSCHEMATC

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source: avrstuff/CPC stuff/gemini/ramcard.sch@ 8e213be

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