EESchema Schematic File Version 4 EELAYER 30 0 EELAYER END $Descr USLedger 17000 11000 encoding utf-8 Sheet 1 2 Title "Unified Retro Keyboard ASCII Interface (2560)" Date "2020-04-16" Rev "3.1" Comp "OSIWeb.org" Comment1 "Main Keyboard Interface" Comment2 "" Comment3 "" Comment4 "" $EndDescr $Comp L Connector_Generic:Conn_01x16 J2 U 1 1 5BCB9E1D P 1200 7900 F 0 "J2" H 1210 8710 50 0000 C CNN F 1 "Apple 1" H 1415 7875 50 0000 C CNN F 2 "Package_DIP:DIP-16_W7.62mm_Socket" H 1200 7900 50 0001 C CNN F 3 "~" H 1200 7900 50 0001 C CNN 1 1200 7900 -1 0 0 -1 $EndComp Text Label 13750 3200 0 50 ~ 0 Row4 Text Label 13750 3100 0 50 ~ 0 Row5 Text Label 13750 3000 0 50 ~ 0 Row6 Text Label 13750 2900 0 50 ~ 0 Row7 Text Label 13750 3300 0 50 ~ 0 Row3 Text Label 13750 3400 0 50 ~ 0 Row2 Text Label 13750 3500 0 50 ~ 0 Row1 Text Label 13750 3600 0 50 ~ 0 Row0 Text Label 13750 2100 0 50 ~ 0 Col7 Text Label 13750 2200 0 50 ~ 0 Col6 Text Label 13750 2300 0 50 ~ 0 Col5 Text Label 13750 2400 0 50 ~ 0 Col4 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0 "D7" H 15335 6860 50 0000 C CNN F 1 "1N4148" H 15258 6940 50 0001 C CNN F 2 "Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal" H 15460 6725 50 0001 C CNN F 3 "https://assets.nexperia.com/documents/data-sheet/1N4148_1N4448.pdf" H 15460 6900 50 0001 C CNN 1 15460 6900 1 0 0 1 $EndComp $Comp L Diode:1N4148 D10 U 1 1 5DF6B891 P 15150 7200 F 0 "D10" H 15025 7160 50 0000 C CNN F 1 "1N4148" H 14948 7240 50 0001 C CNN F 2 "Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal" H 15150 7025 50 0001 C CNN F 3 "https://assets.nexperia.com/documents/data-sheet/1N4148_1N4448.pdf" H 15150 7200 50 0001 C CNN 1 15150 7200 1 0 0 1 $EndComp $Comp L Diode:1N4148 D8 U 1 1 5DF5903F P 15150 7000 F 0 "D8" H 15025 6960 50 0000 C CNN F 1 "1N4148" H 14948 7040 50 0001 C CNN F 2 "Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal" H 15150 6825 50 0001 C CNN F 3 "https://assets.nexperia.com/documents/data-sheet/1N4148_1N4448.pdf" H 15150 7000 50 0001 C CNN 1 15150 7000 1 0 0 1 $EndComp $Comp L Diode:1N4148 D4 U 1 1 5DF45137 P 15150 6600 F 0 "D4" H 15035 6550 50 0000 C CNN F 1 "1N4148" H 15040 6470 50 0000 C CNN F 2 "Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal" H 15150 6425 50 0001 C CNN F 3 "https://assets.nexperia.com/documents/data-sheet/1N4148_1N4448.pdf" H 15150 6600 50 0001 C CNN 1 15150 6600 1 0 0 1 $EndComp $Comp L Diode:1N4148 D6 U 1 1 5DF31D18 P 15150 6800 F 0 "D6" H 15025 6750 50 0000 C CNN F 1 "1N4148" H 14948 6840 50 0001 C CNN F 2 "Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal" H 15150 6625 50 0001 C CNN F 3 "https://assets.nexperia.com/documents/data-sheet/1N4148_1N4448.pdf" H 15150 6800 50 0001 C CNN 1 15150 6800 1 0 0 1 $EndComp $Comp L Diode:1N4148 D5 U 1 1 5DF29274 P 15450 6700 F 0 "D5" H 15325 6660 50 0000 C CNN F 1 "1N4148" H 15248 6740 50 0001 C CNN F 2 "Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal" H 15450 6525 50 0001 C CNN F 3 "https://assets.nexperia.com/documents/data-sheet/1N4148_1N4448.pdf" H 15450 6700 50 0001 C CNN 1 15450 6700 1 0 0 1 $EndComp $Comp L Switch:SW_DIP_x08 SW1 U 1 1 5DF0476A P 14600 7000 F 0 "SW1" H 14600 7667 50 0000 C CNN F 1 "Options" H 14600 7576 50 0000 C CNN F 2 "Button_Switch_THT:SW_DIP_SPSTx08_Piano_CTS_Series194-8MSTN_W7.62mm_P2.54mm" H 14600 7000 50 0001 C CNN F 3 "~" H 14600 7000 50 0001 C CNN 1 14600 7000 1 0 0 -1 $EndComp Text Label 14530 6600 0 50 ~ 0 Row8 Entry Wire Line 13500 3900 13600 3800 Entry Wire Line 13500 4000 13600 3900 Entry Wire Line 13500 3800 13600 3700 Wire Wire Line 13600 3700 14300 3700 Wire Wire Line 14300 3800 13600 3800 Wire Wire Line 13600 3900 14300 3900 Wire Wire Line 14300 4000 13600 4000 Entry Wire Line 13500 4100 13600 4000 Wire Wire Line 13600 3200 14300 3200 Entry Wire Line 15800 2100 15900 2200 Entry Wire Line 15800 2600 15900 2700 Text Label 15445 2600 0 50 ~ 0 Row7 Text Label 15445 2500 0 50 ~ 0 Col0 $Comp L Diode:1N4148 D2 U 1 1 5D9C0280 P 15055 2600 F 0 "D2" H 15190 2570 50 0000 C CNN F 1 "1N4148" H 15230 2640 40 0001 C CNN F 2 "Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal" H 15055 2425 50 0001 C CNN F 3 "https://assets.nexperia.com/documents/data-sheet/1N4148_1N4448.pdf" H 15055 2600 50 0001 C CNN 1 15055 2600 -1 0 0 1 $EndComp $Comp L Diode:1N4148 D3 U 1 1 5EB56F93 P 15055 3000 F 0 "D3" H 15190 2970 50 0000 C CNN F 1 "1N4148" H 15230 3035 40 0001 C CNN F 2 "Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal" H 15055 2825 50 0001 C CNN F 3 "https://assets.nexperia.com/documents/data-sheet/1N4148_1N4448.pdf" H 15055 3000 50 0001 C CNN 1 15055 3000 -1 0 0 1 $EndComp Wire Wire Line 14800 2200 14900 2200 Wire Wire Line 14905 2600 14800 2600 Wire Wire Line 14905 3000 14800 3000 Text Notes 15125 3000 0 50 ~ 0 Rubout Text Notes 15195 2590 0 50 ~ 0 @ Text Notes 15145 2190 0 50 ~ 0 Power Entry Wire Line 15800 2200 15900 2300 Wire Wire Line 14800 2300 14815 2300 Wire Wire Line 14815 2300 14815 1915 $Comp L power:VCC #PWR021 U 1 1 5E8162A5 P 14815 1915 F 0 "#PWR021" H 14815 1765 50 0001 C CNN F 1 "VCC" H 14830 2088 50 0000 C CNN F 2 "" H 14815 1915 50 0001 C CNN F 3 "" H 14815 1915 50 0001 C CNN 1 14815 1915 1 0 0 -1 $EndComp Wire Wire Line 14800 3100 14815 3100 Wire Wire Line 14815 3100 14815 2700 Connection ~ 14815 2300 $Comp L Device:C C7 U 1 1 5E4F4413 P 11700 9550 F 0 "C7" H 11705 9630 50 0000 L CNN F 1 "0.1 uF" H 11715 9465 50 0000 L CNN F 2 "Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm" H 11738 9400 50 0001 C CNN F 3 "~" H 11700 9550 50 0001 C CNN 1 11700 9550 1 0 0 -1 $EndComp $Comp L Device:C C4 U 1 1 5BFE9D13 P 10500 9550 F 0 "C4" H 10505 9630 50 0000 L CNN F 1 "0.1 uF" H 10515 9465 50 0000 L CNN F 2 "Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm" H 10538 9400 50 0001 C CNN F 3 "~" H 10500 9550 50 0001 C CNN 1 10500 9550 1 0 0 -1 $EndComp $Comp L Device:C C3 U 1 1 5BFE9C80 P 10100 9550 F 0 "C3" H 10105 9630 50 0000 L CNN F 1 "0.1 uF" H 10110 9470 50 0000 L CNN F 2 "Crystal:Crystal_SMD_HC49-SD_HandSoldering" H 10138 9400 50 0001 C CNN F 3 "~" H 10100 9550 50 0001 C CNN 1 10100 9550 1 0 0 -1 $EndComp $Comp L Connector_Generic:Conn_01x04 J3 U 1 1 5E4CDDD4 P 1200 9400 F 0 "J3" H 1118 8975 50 0000 C CNN F 1 "UART" H 1118 9066 50 0000 C CNN F 2 "Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Horizontal" H 1200 9400 50 0001 C CNN F 3 "~" H 1200 9400 50 0001 C CNN 1 1200 9400 -1 0 0 -1 $EndComp Wire Wire Line 1500 9250 1500 9300 Text Label 1530 9400 0 50 ~ 0 Tx Text Label 1535 9500 0 50 ~ 0 Rx Wire Wire Line 14815 2700 14800 2700 Connection ~ 14815 2700 Wire Wire Line 14815 2700 14815 2300 Entry Wire Line 15800 2400 15900 2500 Text Label 15450 2400 0 50 ~ 0 LED1 Text Label 15475 2800 0 50 ~ 0 LED2 Text Label 15475 3200 0 50 ~ 0 LED3 Entry Wire Line 13500 7200 13600 7300 Entry Wire Line 15800 3000 15900 3100 Wire Wire Line 1400 8600 2100 8600 Text Label 1500 8300 0 50 ~ 0 OUT1 Text Notes 1385 8595 0 50 ~ 0 (D7 to +5V) NoConn ~ 1400 8400 NoConn ~ 1400 8100 NoConn ~ 1400 8200 NoConn ~ 1400 5300 NoConn ~ 1400 5800 NoConn ~ 1400 6300 NoConn ~ 1400 6400 NoConn ~ 1400 6500 Text Notes 3395 9280 0 50 ~ 0 SOL-20:\n/RESET (PIN 13) = OUT1 \nBREAK (PIN 4) = OUT2 \nLOCAL (PIN 14) = OUT3 \n\n\nApple 1:\nD7 on socket is tied high\n/RESET = OUT3\nCLRSCR = OUT1\n\nApple 2:\n/RESET = OUT3\n\n $Comp L Connector_Generic:Conn_01x20 J5 U 1 1 5E5FA80F P 1300 3000 F 0 "J5" H 1218 4117 50 0000 C CNN F 1 "SOL-20" H 1535 2980 50 0000 C CNN F 2 "unikbd:SOL20-header-vertical" H 1300 3000 50 0001 C CNN F 3 "~" H 1300 3000 50 0001 C CNN 1 1300 3000 -1 0 0 -1 $EndComp Text Label 1610 2500 0 50 ~ 0 D0 Text Label 1610 2600 0 50 ~ 0 D1 Text Label 1610 2700 0 50 ~ 0 D2 Text Label 1610 2800 0 50 ~ 0 D3 Text Label 1610 3500 0 50 ~ 0 D4 Text Label 1610 3600 0 50 ~ 0 D5 Text Label 1610 3700 0 50 ~ 0 D6 Text Label 1610 3800 0 50 ~ 0 D7 Text Label 1610 2300 0 50 ~ 0 ~STROBE Text Label 1610 3300 0 50 ~ 0 OUT3 Text Label 1610 3400 0 50 ~ 0 OUT1 $Comp L power:GND #PWR016 U 1 1 5EC5500D P 8300 8800 F 0 "#PWR016" H 8300 8550 50 0001 C CNN F 1 "GND" H 8305 8627 50 0000 C CNN F 2 "" H 8300 8800 50 0001 C CNN F 3 "" H 8300 8800 50 0001 C CNN 1 8300 8800 1 0 0 -1 $EndComp Wire Wire Line 8100 2000 8100 1600 Wire Wire Line 8400 1600 8200 1600 Connection ~ 8100 1600 Wire Wire Line 8200 2000 8200 1600 Connection ~ 8200 1600 Wire Wire Line 8200 1600 8100 1600 Wire Wire Line 7900 2000 7900 1600 Wire Wire Line 7900 1600 8000 1600 Wire Wire Line 8000 2000 8000 1600 Connection ~ 8000 1600 Wire Wire Line 8000 1600 8100 1600 $Comp L Connector_Generic:Conn_01x06 J6 U 1 1 5DA566B2 P 4300 3200 F 0 "J6" H 4380 3192 50 0000 L CNN F 1 "ISP header" H 4380 3101 50 0000 L CNN F 2 "Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Horizontal" H 4300 3200 50 0001 C CNN F 3 "~" H 4300 3200 50 0001 C CNN 1 4300 3200 -1 0 0 -1 $EndComp $Comp L power:GND #PWR012 U 1 1 5EFF9297 P 4700 3700 F 0 "#PWR012" H 4700 3450 50 0001 C CNN F 1 "GND" H 4705 3527 50 0000 C CNN F 2 "" H 4700 3700 50 0001 C CNN F 3 "" H 4700 3700 50 0001 C CNN 1 4700 3700 1 0 0 -1 $EndComp Wire Wire Line 4500 3100 4700 3100 Wire Wire Line 4700 3100 4700 2900 Wire Wire Line 4500 3200 7300 3200 Wire Wire Line 4500 3000 5800 3000 Wire 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Connection ~ 2200 3200 Wire Wire Line 2200 3200 2200 2900 Wire Wire Line 1500 2300 2400 2300 Wire Wire Line 1500 2400 2400 2400 Text Label 1600 2400 0 50 ~ 0 OUT2 Wire Wire Line 1500 1000 2200 1000 Wire Wire Line 2200 1000 2200 800 Wire Wire Line 1500 1400 2000 1400 Wire Wire Line 2000 1400 2000 1500 $Comp L power:GND #PWR05 U 1 1 5F9FA5EE P 2000 1500 F 0 "#PWR05" H 2000 1250 50 0001 C CNN F 1 "GND" H 2005 1327 50 0000 C CNN F 2 "" H 2000 1500 50 0001 C CNN F 3 "" H 2000 1500 50 0001 C CNN 1 2000 1500 1 0 0 -1 $EndComp Wire Wire Line 2400 1100 1500 1100 Wire Wire Line 2400 1200 1500 1200 Wire Wire Line 2400 1300 1500 1300 Wire Wire Line 2400 2500 1500 2500 Wire Wire Line 2400 2600 1500 2600 Wire Wire Line 2400 2700 1500 2700 Wire Wire Line 2400 3300 1500 3300 Wire Wire Line 2400 3400 1500 3400 Wire Wire Line 2400 3500 1500 3500 Wire Wire Line 2400 3600 1500 3600 Wire Wire Line 2400 3700 1500 3700 Wire Wire Line 2400 3800 1500 3800 Wire Wire Line 2400 2800 1500 2800 Wire Wire Line 1400 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"Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 5640 1690 50 0001 C CNN F 3 "~" H 5600 1700 50 0001 C CNN 1 5600 1700 1 0 0 -1 $EndComp Wire Wire Line 5600 1850 5600 2700 $Comp L Device:Crystal Y1 U 1 1 5EA2E720 P 6350 1950 F 0 "Y1" H 6350 1682 50 0000 C CNN F 1 "16.000 MHz" H 6350 1773 50 0000 C CNN F 2 "Crystal:Crystal_SMD_HC49-SD_HandSoldering" H 6350 1950 50 0001 C CNN F 3 "~" H 6350 1950 50 0001 C CNN 1 6350 1950 -1 0 0 1 $EndComp $Comp L Device:C C1 U 1 1 5EA513C7 P 6050 2200 F 0 "C1" H 6165 2246 50 0000 L CNN F 1 "36pf" H 6165 2155 50 0000 L CNN F 2 "Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm" H 6088 2050 50 0001 C CNN F 3 "~" H 6050 2200 50 0001 C CNN 1 6050 2200 1 0 0 -1 $EndComp $Comp L Device:C C2 U 1 1 5EA526AF P 6650 2200 F 0 "C2" H 6765 2246 50 0000 L CNN F 1 "36pf" H 6765 2155 50 0000 L CNN F 2 "Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm" H 6688 2050 50 0001 C CNN F 3 "~" H 6650 2200 50 0001 C CNN 1 6650 2200 1 0 0 -1 $EndComp $Comp L power:GND #PWR014 U 1 1 5EA55577 P 6050 2350 F 0 "#PWR014" H 6050 2100 50 0001 C CNN F 1 "GND" H 6055 2177 50 0000 C CNN F 2 "" H 6050 2350 50 0001 C CNN F 3 "" H 6050 2350 50 0001 C CNN 1 6050 2350 1 0 0 -1 $EndComp Wire Wire Line 7300 2300 7300 1550 Wire Wire Line 7300 1550 6050 1550 Wire Wire Line 6050 1550 6050 1950 Wire Wire Line 6650 2050 6650 1950 Wire Wire Line 6650 1950 7200 1950 Wire Wire Line 7200 2500 7300 2500 Wire Wire Line 6500 1950 6650 1950 Connection ~ 6650 1950 Wire Wire Line 6200 1950 6050 1950 Connection ~ 6050 1950 Wire Wire Line 6050 1950 6050 2050 Wire Wire Line 7200 1950 7200 2500 Entry Wire Line 15800 3200 15900 3300 Entry Wire Line 15800 2800 15900 2900 Entry Wire Line 10700 3600 10600 3500 Entry Wire Line 10700 4000 10600 3900 Entry Wire Line 10700 4300 10600 4200 Entry Wire Line 10700 3800 10600 3700 Entry Wire Line 10700 4100 10600 4000 Entry Wire Line 10700 3700 10600 3600 Entry Wire Line 10700 4200 10600 4100 Entry Wire Line 10700 3900 10600 3800 $Comp L Diode:1N4148 D20 U 1 1 5E301C34 P 10150 3500 F 0 "D20" H 11000 3500 50 0000 C CNN F 1 "1N4148" H 10090 3610 50 0000 C CNN F 2 "Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal" H 10150 3325 50 0001 C CNN F 3 "https://assets.nexperia.com/documents/data-sheet/1N4148_1N4448.pdf" H 10150 3500 50 0001 C CNN 1 10150 3500 1 0 0 -1 $EndComp $Comp L Diode:1N4148 D14 U 1 1 5E36B862 P 9950 3600 F 0 "D14" H 11000 3600 50 0000 C CNN F 1 "1N4148" H 9748 3640 50 0001 C CNN F 2 "Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal" H 9950 3425 50 0001 C CNN F 3 "https://assets.nexperia.com/documents/data-sheet/1N4148_1N4448.pdf" H 9950 3600 50 0001 C CNN 1 9950 3600 1 0 0 -1 $EndComp $Comp L Diode:1N4148 D21 U 1 1 5E3942E4 P 10150 3700 F 0 "D21" H 11000 3700 50 0000 C CNN F 1 "1N4148" H 9948 3740 50 0001 C CNN F 2 "Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal" H 10150 3525 50 0001 C CNN F 3 "https://assets.nexperia.com/documents/data-sheet/1N4148_1N4448.pdf" H 10150 3700 50 0001 C CNN 1 10150 3700 1 0 0 -1 $EndComp $Comp L Diode:1N4148 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