1.1 --- a/clocks.sch Mon Jan 23 00:37:25 2023 +0100
1.2 +++ b/clocks.sch Tue Jan 24 21:56:51 2023 +0100
1.3 @@ -4,7 +4,7 @@
1.4 EELAYER END
1.5 $Descr A4 11693 8268
1.6 encoding utf-8
1.7 -Sheet 2 9
1.8 +Sheet 2 10
1.9 Title ""
1.10 Date ""
1.11 Rev ""
1.12 @@ -307,108 +307,108 @@
1.13 $Comp
1.14 L 74xx:74LS163 IC?
1.15 U 1 1 61F9FB39
1.16 -P 6500 2700
1.17 +P 7900 2700
1.18 AR Path="/61F9FB39" Ref="IC?" Part="1"
1.19 AR Path="/61DF4BC2/61F9FB39" Ref="IC9" Part="1"
1.20 -F 0 "IC9" H 6200 3600 50 0000 C CNN
1.21 -F 1 "74LS163" H 6200 3500 50 0000 C CNN
1.22 -F 2 "" H 6500 2700 50 0001 C CNN
1.23 -F 3 "http://www.ti.com/lit/gpn/sn74LS169" H 6500 2700 50 0001 C CNN
1.24 - 1 6500 2700
1.25 +F 0 "IC9" H 7600 3600 50 0000 C CNN
1.26 +F 1 "74LS163" H 7600 3500 50 0000 C CNN
1.27 +F 2 "" H 7900 2700 50 0001 C CNN
1.28 +F 3 "http://www.ti.com/lit/gpn/sn74LS169" H 7900 2700 50 0001 C CNN
1.29 + 1 7900 2700
1.30 1 0 0 -1
1.31 $EndComp
1.32 Wire Wire Line
1.33 - 5900 2500 5900 2400
1.34 + 7300 2500 7300 2400
1.35 Wire Wire Line
1.36 - 5900 2400 6000 2400
1.37 + 7300 2400 7400 2400
1.38 Wire Wire Line
1.39 - 5900 2500 6000 2500
1.40 + 7300 2500 7400 2500
1.41 Wire Wire Line
1.42 - 7000 2500 7200 2500
1.43 -Text GLabel 6500 3650 3 50 Input ~ 0
1.44 + 8400 2500 8600 2500
1.45 +Text GLabel 7900 3650 3 50 Input ~ 0
1.46 0V
1.47 Wire Wire Line
1.48 - 6500 3650 6500 3500
1.49 -Text GLabel 6500 1800 1 50 Input ~ 0
1.50 + 7900 3650 7900 3500
1.51 +Text GLabel 7900 1600 1 50 Input ~ 0
1.52 5V
1.53 Wire Wire Line
1.54 - 6500 1900 6500 1800
1.55 + 7900 1900 7900 1700
1.56 Wire Wire Line
1.57 - 4100 3000 6000 3000
1.58 -Text GLabel 5800 3200 0 50 Input ~ 0
1.59 + 4100 3000 7400 3000
1.60 +Text GLabel 7200 3200 0 50 Input ~ 0
1.61 0V
1.62 -NoConn ~ 7000 2300
1.63 -NoConn ~ 7000 2200
1.64 -NoConn ~ 7000 2700
1.65 +NoConn ~ 8400 2300
1.66 +NoConn ~ 8400 2200
1.67 +NoConn ~ 8400 2700
1.68 Wire Wire Line
1.69 - 5800 3200 5900 3200
1.70 + 7200 3200 7300 3200
1.71 Wire Wire Line
1.72 - 5900 2400 5900 2300
1.73 + 7300 2400 7300 2300
1.74 Wire Wire Line
1.75 - 5900 2300 6000 2300
1.76 -Connection ~ 5900 2400
1.77 + 7300 2300 7400 2300
1.78 +Connection ~ 7300 2400
1.79 Wire Wire Line
1.80 - 5900 2300 5900 2200
1.81 + 7300 2300 7300 2200
1.82 Wire Wire Line
1.83 - 5900 2200 6000 2200
1.84 -Connection ~ 5900 2300
1.85 + 7300 2200 7400 2200
1.86 +Connection ~ 7300 2300
1.87 $Comp
1.88 L 74xx:74LS00 U?
1.89 U 1 1 61F9FB55
1.90 -P 7600 2500
1.91 +P 9000 2500
1.92 AR Path="/61F9FB55" Ref="U?" Part="1"
1.93 AR Path="/61DF4BC2/61F9FB55" Ref="IC17" Part="1"
1.94 -F 0 "IC17" H 7600 2825 50 0000 C CNN
1.95 -F 1 "74LS00" H 7600 2734 50 0000 C CNN
1.96 -F 2 "" H 7600 2500 50 0001 C CNN
1.97 -F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 7600 2500 50 0001 C CNN
1.98 - 1 7600 2500
1.99 +F 0 "IC17" H 9000 2825 50 0000 C CNN
1.100 +F 1 "74LS00" H 9000 2734 50 0000 C CNN
1.101 +F 2 "" H 9000 2500 50 0001 C CNN
1.102 +F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 9000 2500 50 0001 C CNN
1.103 + 1 9000 2500
1.104 1 0 0 -1
1.105 $EndComp
1.106 Wire Wire Line
1.107 - 7000 2400 7300 2400
1.108 + 8400 2400 8700 2400
1.109 Wire Wire Line
1.110 - 7200 2500 7200 2600
1.111 + 8600 2500 8600 2600
1.112 Wire Wire Line
1.113 - 7200 2600 7300 2600
1.114 + 8600 2600 8700 2600
1.115 Wire Wire Line
1.116 - 7900 2500 7900 1600
1.117 + 9300 2500 9300 1400
1.118 Wire Wire Line
1.119 - 7900 1600 5600 1600
1.120 + 9300 1400 7000 1400
1.121 Wire Wire Line
1.122 - 5600 1600 5600 2700
1.123 + 7000 1400 7000 2700
1.124 Wire Wire Line
1.125 - 5600 2700 6000 2700
1.126 + 7000 2700 7400 2700
1.127 Wire Wire Line
1.128 - 5900 2500 5900 2800
1.129 -Connection ~ 5900 2500
1.130 -Connection ~ 5900 3200
1.131 + 7300 2500 7300 2800
1.132 +Connection ~ 7300 2500
1.133 +Connection ~ 7300 3200
1.134 Wire Wire Line
1.135 - 5900 3200 6000 3200
1.136 + 7300 3200 7400 3200
1.137 Wire Wire Line
1.138 - 6000 2800 5900 2800
1.139 -Connection ~ 5900 2800
1.140 + 7400 2800 7300 2800
1.141 +Connection ~ 7300 2800
1.142 Wire Wire Line
1.143 - 5900 2800 5900 2900
1.144 + 7300 2800 7300 2900
1.145 Wire Wire Line
1.146 - 6000 2900 5900 2900
1.147 -Connection ~ 5900 2900
1.148 + 7400 2900 7300 2900
1.149 +Connection ~ 7300 2900
1.150 Wire Wire Line
1.151 - 5900 2900 5900 3200
1.152 -Text Notes 6900 3300 0 50 ~ 0
1.153 + 7300 2900 7300 3200
1.154 +Text Notes 8300 3300 0 50 ~ 0
1.155 Service Manual and issue 4\nuse 74LS169 for IC9.
1.156 Wire Wire Line
1.157 4100 3000 4100 1800
1.158 Connection ~ 4100 1800
1.159 Wire Wire Line
1.160 4100 1800 4100 1200
1.161 -Text GLabel 8100 2800 2 50 Output ~ 0
1.162 +Text GLabel 9500 2800 2 50 Output ~ 0
1.163 CLOCK_16MHz_DIV_13
1.164 Wire Wire Line
1.165 - 8100 2800 7200 2800
1.166 + 9500 2800 8600 2800
1.167 Wire Wire Line
1.168 - 7200 2800 7200 2600
1.169 -Connection ~ 7200 2600
1.170 + 8600 2800 8600 2600
1.171 +Connection ~ 8600 2600
1.172 Text Notes 4200 2950 0 50 ~ 0
1.173 Issue 6 boards tend to have\nIC18 (74LS08) fitted for\nsome kind of buffering\nof the clock signal.\n\nWithout it, LK10 is made to\ndeliver the signal directly,\nbut LK10 seems not to be made.\n\nAccording to "Acorn Information\n- Volume 1", LK10 would be\nmade for boards using the\nFerranti ULA.
1.174 $Comp
1.175 @@ -450,26 +450,7 @@
1.176 Connection ~ 5500 1100
1.177 Wire Wire Line
1.178 5500 1100 5400 1100
1.179 -$Comp
1.180 -L 74xx:74LS00 IC17
1.181 -U 5 1 61F8B195
1.182 -P 9700 2700
1.183 -F 0 "IC17" H 9930 2746 50 0000 L CNN
1.184 -F 1 "74LS00" H 9930 2655 50 0000 L CNN
1.185 -F 2 "" H 9700 2700 50 0001 C CNN
1.186 -F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 9700 2700 50 0001 C CNN
1.187 - 5 9700 2700
1.188 - 1 0 0 -1
1.189 -$EndComp
1.190 -Text GLabel 9700 2100 1 50 Input ~ 0
1.191 -5V
1.192 -Text GLabel 9700 3300 3 50 Input ~ 0
1.193 -0V
1.194 -Wire Wire Line
1.195 - 9700 2200 9700 2100
1.196 -Wire Wire Line
1.197 - 9700 3300 9700 3200
1.198 -Text Notes 8000 2300 0 50 ~ 0
1.199 +Text Notes 9400 2300 0 50 ~ 0
1.200 IC17 label deduced from schematic.
1.201 $Comp
1.202 L Device:C_Variable VC1
1.203 @@ -486,4 +467,29 @@
1.204 2550 2600 2350 2600
1.205 Text Notes 1600 2650 2 50 ~ 0
1.206 PAL video clock circuit.
1.207 +$Comp
1.208 +L Device:C_Small A?
1.209 +U 1 1 646F71A5
1.210 +P 7100 3500
1.211 +AR Path="/61D7EEE8/646F71A5" Ref="A?" Part="1"
1.212 +AR Path="/61DF4BC2/646F71A5" Ref="A6" Part="1"
1.213 +F 0 "A6" V 7250 3500 50 0000 C CNN
1.214 +F 1 "47n/33n decoupler" V 6950 3500 50 0000 C CNN
1.215 +F 2 "" H 7100 3500 50 0001 C CNN
1.216 +F 3 "~" H 7100 3500 50 0001 C CNN
1.217 + 1 7100 3500
1.218 + 0 1 1 0
1.219 +$EndComp
1.220 +Wire Wire Line
1.221 + 7900 3500 7200 3500
1.222 +Wire Wire Line
1.223 + 7000 3500 6600 3500
1.224 +Connection ~ 7900 3500
1.225 +Wire Wire Line
1.226 + 6600 3500 6600 1700
1.227 +Wire Wire Line
1.228 + 6600 1700 7900 1700
1.229 +Connection ~ 7900 1700
1.230 +Wire Wire Line
1.231 + 7900 1700 7900 1600
1.232 $EndSCHEMATC