EESchema Schematic File Version 4
EELAYER 30 0
EELAYER END
$Descr A3 16535 11693
encoding utf-8
Sheet 1 1
Title ""
Date ""
Rev ""
Comp ""
Comment1 ""
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
Text Notes 12250 10950 0    79   ~ 0
Pat80 Z80 home computer
Text Notes 13000 11050 0    50   ~ 0
2021-03-15
$Comp
L Memory_EEPROM:28C256 U3
U 1 1 604F6B81
P 8600 5700
F 0 "U3" V 8646 4556 50  0000 R CNN
F 1 "256k (32k x 8) EEPROM" V 8555 4556 50  0000 R CNN
F 2 "" H 8600 5700 50  0001 C CNN
F 3 "http://ww1.microchip.com/downloads/en/DeviceDoc/doc0006.pdf" H 8600 5700 50  0001 C CNN
	1    8600 5700
	0    -1   -1   0   
$EndComp
Entry Wire Line
	5900 5550 6000 5650
Entry Wire Line
	5900 5650 6000 5750
Entry Wire Line
	5900 5750 6000 5850
Entry Wire Line
	5900 5850 6000 5950
Entry Wire Line
	5900 5950 6000 6050
Entry Wire Line
	5900 6050 6000 6150
Entry Wire Line
	5900 6150 6000 6250
Entry Wire Line
	5900 6250 6000 6350
Entry Wire Line
	5900 6350 6000 6450
Entry Wire Line
	5900 6450 6000 6550
Entry Wire Line
	5900 6550 6000 6650
Entry Wire Line
	5900 6650 6000 6750
Entry Wire Line
	5900 6750 6000 6850
Entry Wire Line
	5900 6850 6000 6950
Entry Wire Line
	5900 6950 6000 7050
Wire Wire Line
	5600 5450 5900 5450
Wire Wire Line
	5600 5550 5900 5550
Wire Wire Line
	5600 5650 5900 5650
Wire Wire Line
	5600 5750 5900 5750
Wire Wire Line
	5600 5850 5900 5850
Wire Wire Line
	5600 5950 5900 5950
Wire Wire Line
	5600 6050 5900 6050
Wire Wire Line
	5600 6150 5900 6150
Wire Wire Line
	5600 6250 5900 6250
Wire Wire Line
	5600 6350 5900 6350
Wire Wire Line
	5600 6450 5900 6450
Wire Wire Line
	5600 6550 5900 6550
Wire Wire Line
	5600 6650 5900 6650
Wire Wire Line
	5600 6750 5900 6750
Wire Wire Line
	5600 6850 5900 6850
Wire Wire Line
	5600 6950 5900 6950
Entry Wire Line
	7700 6200 7600 6300
Entry Wire Line
	7800 6200 7700 6300
Entry Wire Line
	7900 6200 7800 6300
Entry Wire Line
	8000 6200 7900 6300
Entry Wire Line
	8100 6200 8000 6300
Entry Wire Line
	8200 6200 8100 6300
Entry Wire Line
	8300 6200 8200 6300
Entry Wire Line
	8400 6200 8300 6300
Entry Wire Line
	8500 6200 8400 6300
Entry Wire Line
	8600 6200 8500 6300
Entry Wire Line
	8700 6200 8600 6300
Entry Wire Line
	8800 6200 8700 6300
Entry Wire Line
	8900 6200 8800 6300
Entry Wire Line
	9000 6200 8900 6300
Entry Wire Line
	9100 6200 9000 6300
Wire Wire Line
	7700 6100 7700 6200
Wire Wire Line
	7800 6100 7800 6200
Wire Wire Line
	7900 6100 7900 6200
Wire Wire Line
	8000 6100 8000 6200
Wire Wire Line
	8100 6100 8100 6200
Wire Wire Line
	8200 6100 8200 6200
Wire Wire Line
	8300 6100 8300 6200
Wire Wire Line
	8400 6100 8400 6200
Wire Wire Line
	8500 6100 8500 6200
Wire Wire Line
	8600 6100 8600 6200
Wire Wire Line
	8700 6100 8700 6200
Wire Wire Line
	8800 6100 8800 6200
Wire Wire Line
	8900 6100 8900 6200
Wire Wire Line
	9000 6100 9000 6200
Wire Wire Line
	9100 6100 9100 6200
Text Label 5700 5450 0    50   ~ 0
A0
Text Label 5700 5550 0    50   ~ 0
A1
Text Label 5700 5650 0    50   ~ 0
A2
Text Label 5700 5750 0    50   ~ 0
A3
Text Label 5700 5850 0    50   ~ 0
A4
Text Label 5700 5950 0    50   ~ 0
A5
Text Label 5700 6050 0    50   ~ 0
A6
Text Label 5700 6150 0    50   ~ 0
A7
Text Label 5700 6250 0    50   ~ 0
A8
Text Label 5700 6350 0    50   ~ 0
A9
Text Label 5700 6450 0    50   ~ 0
A10
Text Label 5700 6550 0    50   ~ 0
A11
Text Label 5700 6650 0    50   ~ 0
A12
Text Label 5700 6750 0    50   ~ 0
A13
Text Label 5700 6850 0    50   ~ 0
A14
Text Label 5700 6950 0    50   ~ 0
A15
Text Label 7700 6150 3    50   ~ 0
A0
Text Label 7800 6150 3    50   ~ 0
A1
Text Label 7900 6150 3    50   ~ 0
A2
Text Label 8000 6150 3    50   ~ 0
A3
Text Label 8100 6150 3    50   ~ 0
A4
Text Label 8200 6150 3    50   ~ 0
A5
Text Label 8300 6150 3    50   ~ 0
A6
Text Label 8400 6150 3    50   ~ 0
A7
Text Label 8500 6150 3    50   ~ 0
A8
Text Label 8600 6150 3    50   ~ 0
A9
Text Label 8700 6150 3    50   ~ 0
A10
Text Label 8800 6150 3    50   ~ 0
A11
Text Label 8900 6150 3    50   ~ 0
A12
Text Label 9000 6150 3    50   ~ 0
A13
Text Label 9100 6150 3    50   ~ 0
A14
Entry Wire Line
	7700 7750 7600 7850
Entry Wire Line
	7800 7750 7700 7850
Entry Wire Line
	7900 7750 7800 7850
Entry Wire Line
	8000 7750 7900 7850
Entry Wire Line
	8100 7750 8000 7850
Entry Wire Line
	8200 7750 8100 7850
Entry Wire Line
	8300 7750 8200 7850
Entry Wire Line
	8400 7750 8300 7850
Entry Wire Line
	8500 7750 8400 7850
Entry Wire Line
	8600 7750 8500 7850
Entry Wire Line
	8700 7750 8600 7850
Entry Wire Line
	8800 7750 8700 7850
Entry Wire Line
	8900 7750 8800 7850
Entry Wire Line
	9000 7750 8900 7850
Entry Wire Line
	9100 7750 9000 7850
Wire Wire Line
	7700 7750 7700 7650
Wire Wire Line
	7800 7750 7800 7650
Wire Wire Line
	7900 7750 7900 7650
Wire Wire Line
	8000 7750 8000 7650
Wire Wire Line
	8100 7750 8100 7650
Wire Wire Line
	8200 7750 8200 7650
Wire Wire Line
	8300 7750 8300 7650
Wire Wire Line
	8400 7750 8400 7650
Wire Wire Line
	8500 7750 8500 7650
Wire Wire Line
	8600 7750 8600 7650
Wire Wire Line
	8700 7750 8700 7650
Wire Wire Line
	8800 7750 8800 7650
Wire Wire Line
	8900 7750 8900 7650
Wire Wire Line
	9000 7750 9000 7650
Wire Wire Line
	9100 7750 9100 7650
Text Label 7700 7700 3    50   ~ 0
A0
Text Label 7800 7700 3    50   ~ 0
A1
Text Label 7900 7700 3    50   ~ 0
A2
Text Label 8000 7700 3    50   ~ 0
A3
Text Label 8100 7700 3    50   ~ 0
A4
Text Label 8200 7700 3    50   ~ 0
A5
Text Label 8300 7700 3    50   ~ 0
A6
Text Label 8400 7700 3    50   ~ 0
A7
Text Label 8500 7700 3    50   ~ 0
A8
Text Label 8600 7700 3    50   ~ 0
A9
Text Label 8700 7700 3    50   ~ 0
A10
Text Label 8800 7700 3    50   ~ 0
A11
Text Label 8900 7700 3    50   ~ 0
A12
Text Label 9000 7700 3    50   ~ 0
A13
Text Label 9100 7700 3    50   ~ 0
A14
Entry Wire Line
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Entry Wire Line
	5900 7150 6000 7250
Entry Wire Line
	5900 7250 6000 7350
Entry Wire Line
	5900 7350 6000 7450
Entry Wire Line
	5900 7450 6000 7550
Entry Wire Line
	5900 7550 6000 7650
Entry Wire Line
	5900 7650 6000 7750
Entry Wire Line
	5900 7750 6000 7850
Entry Wire Line
	5900 7850 6000 7950
Wire Wire Line
	5600 7150 5900 7150
Wire Wire Line
	5600 7250 5900 7250
Wire Wire Line
	5600 7350 5900 7350
Wire Wire Line
	5600 7450 5900 7450
Wire Wire Line
	5600 7550 5900 7550
Wire Wire Line
	5600 7650 5900 7650
Wire Wire Line
	5600 7750 5900 7750
Wire Wire Line
	5600 7850 5900 7850
Wire Bus Line
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Entry Wire Line
	7700 6750 7800 6650
Entry Wire Line
	7900 6650 7800 6750
Entry Wire Line
	8000 6650 7900 6750
Entry Wire Line
	8100 6650 8000 6750
Entry Wire Line
	8200 6650 8100 6750
Entry Wire Line
	8300 6650 8200 6750
Entry Wire Line
	8400 6650 8300 6750
Entry Wire Line
	8500 6650 8400 6750
Wire Wire Line
	7700 6850 7700 6750
Wire Wire Line
	7800 6850 7800 6750
Wire Wire Line
	7900 6850 7900 6750
Wire Wire Line
	8000 6850 8000 6750
Wire Wire Line
	8100 6850 8100 6750
Wire Wire Line
	8200 6850 8200 6750
Wire Wire Line
	8300 6850 8300 6750
Wire Wire Line
	8400 6850 8400 6750
Wire Bus Line
	10350 6650 10350 8350
Entry Wire Line
	7800 5100 7700 5200
Entry Wire Line
	7900 5100 7800 5200
Entry Wire Line
	8000 5100 7900 5200
Entry Wire Line
	8100 5100 8000 5200
Entry Wire Line
	8200 5100 8100 5200
Entry Wire Line
	8300 5100 8200 5200
Entry Wire Line
	8400 5100 8300 5200
Entry Wire Line
	8500 5100 8400 5200
Wire Wire Line
	7700 5300 7700 5200
Wire Wire Line
	7800 5300 7800 5200
Wire Wire Line
	7900 5300 7900 5200
Wire Wire Line
	8000 5300 8000 5200
Wire Wire Line
	8100 5300 8100 5200
Wire Wire Line
	8200 5300 8200 5200
Wire Wire Line
	8300 5300 8300 5200
Wire Wire Line
	8400 5300 8400 5200
Wire Bus Line
	10350 5100 10350 6650
Connection ~ 10350 6650
Text Label 7700 5200 3    50   ~ 0
D0
Text Label 7800 5200 3    50   ~ 0
D1
Text Label 7900 5200 3    50   ~ 0
D2
Text Label 8000 5200 3    50   ~ 0
D3
Text Label 8100 5200 3    50   ~ 0
D4
Text Label 8200 5200 3    50   ~ 0
D5
Text Label 8300 5200 3    50   ~ 0
D6
Text Label 8400 5200 3    50   ~ 0
D7
Text Label 7700 6750 3    50   ~ 0
D0
Text Label 7800 6750 3    50   ~ 0
D1
Text Label 7900 6750 3    50   ~ 0
D2
Text Label 8000 6750 3    50   ~ 0
D3
Text Label 8100 6750 3    50   ~ 0
D4
Text Label 8200 6750 3    50   ~ 0
D5
Text Label 8300 6750 3    50   ~ 0
D6
Text Label 8400 6750 3    50   ~ 0
D7
Text Label 5700 7150 0    50   ~ 0
D0
Text Label 5700 7250 0    50   ~ 0
D1
Text Label 5700 7350 0    50   ~ 0
D2
Text Label 5700 7450 0    50   ~ 0
D3
Text Label 5700 7550 0    50   ~ 0
D4
Text Label 5700 7650 0    50   ~ 0
D5
Text Label 5700 7750 0    50   ~ 0
D6
Text Label 5700 7850 0    50   ~ 0
D7
Entry Wire Line
	5900 5450 6000 5550
$Comp
L Memory_EEPROM:28C256 U4
U 1 1 604FD5C5
P 8600 7250
F 0 "U4" V 8646 6106 50  0000 R CNN
F 1 "256k (32k x 8) SRAM" V 8555 6106 50  0000 R CNN
F 2 "" H 8600 7250 50  0001 C CNN
F 3 "http://ww1.microchip.com/downloads/en/DeviceDoc/doc0006.pdf" H 8600 7250 50  0001 C CNN
	1    8600 7250
	0    -1   -1   0   
$EndComp
$Comp
L power:GND #PWR?
U 1 1 60507104
P 9700 5700
F 0 "#PWR?" H 9700 5450 50  0001 C CNN
F 1 "GND" H 9705 5527 50  0000 C CNN
F 2 "" H 9700 5700 50  0001 C CNN
F 3 "" H 9700 5700 50  0001 C CNN
	1    9700 5700
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR?
U 1 1 6050737A
P 9700 7250
F 0 "#PWR?" H 9700 7000 50  0001 C CNN
F 1 "GND" H 9705 7077 50  0000 C CNN
F 2 "" H 9700 7250 50  0001 C CNN
F 3 "" H 9700 7250 50  0001 C CNN
	1    9700 7250
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR?
U 1 1 605076F8
P 4900 8150
F 0 "#PWR?" H 4900 7900 50  0001 C CNN
F 1 "GND" H 4905 7977 50  0000 C CNN
F 2 "" H 4900 8150 50  0001 C CNN
F 3 "" H 4900 8150 50  0001 C CNN
	1    4900 8150
	1    0    0    -1  
$EndComp
$Comp
L power:VCC #PWR?
U 1 1 60507B8E
P 4900 4650
F 0 "#PWR?" H 4900 4500 50  0001 C CNN
F 1 "VCC" H 4917 4823 50  0000 C CNN
F 2 "" H 4900 4650 50  0001 C CNN
F 3 "" H 4900 4650 50  0001 C CNN
	1    4900 4650
	1    0    0    -1  
$EndComp
$Comp
L power:VCC #PWR?
U 1 1 60507E3C
P 7500 5700
F 0 "#PWR?" H 7500 5550 50  0001 C CNN
F 1 "VCC" H 7517 5873 50  0000 C CNN
F 2 "" H 7500 5700 50  0001 C CNN
F 3 "" H 7500 5700 50  0001 C CNN
	1    7500 5700
	1    0    0    -1  
$EndComp
$Comp
L power:VCC #PWR?
U 1 1 605080EF
P 7500 7250
F 0 "#PWR?" H 7500 7100 50  0001 C CNN
F 1 "VCC" H 7517 7423 50  0000 C CNN
F 2 "" H 7500 7250 50  0001 C CNN
F 3 "" H 7500 7250 50  0001 C CNN
	1    7500 7250
	1    0    0    -1  
$EndComp
$Comp
L power:VCC #PWR?
U 1 1 60508CD5
P 4050 7750
F 0 "#PWR?" H 4050 7600 50  0001 C CNN
F 1 "VCC" H 4067 7923 50  0000 C CNN
F 2 "" H 4050 7750 50  0001 C CNN
F 3 "" H 4050 7750 50  0001 C CNN
	1    4050 7750
	1    0    0    -1  
$EndComp
$Comp
L CPU:Z80CPU U1
U 1 1 604F040E
P 4900 6650
F 0 "U1" H 4900 8331 50  0000 C CNN
F 1 "Z80CPU" H 4900 8240 50  0000 C CNN
F 2 "" H 4900 7050 50  0001 C CNN
F 3 "www.zilog.com/manage_directlink.php?filepath=docs/z80/um0080" H 4900 7050 50  0001 C CNN
	1    4900 6650
	1    0    0    -1  
$EndComp
Wire Wire Line
	4200 6650 4050 6650
$Comp
L power:VCC #PWR?
U 1 1 6050EE1E
P 4050 6650
F 0 "#PWR?" H 4050 6500 50  0001 C CNN
F 1 "VCC" H 4067 6823 50  0000 C CNN
F 2 "" H 4050 6650 50  0001 C CNN
F 3 "" H 4050 6650 50  0001 C CNN
	1    4050 6650
	1    0    0    -1  
$EndComp
$Comp
L Device:C C?
U 1 1 6055A1F9
P 5300 4650
F 0 "C?" V 5048 4650 50  0000 C CNN
F 1 "100nF" V 5139 4650 50  0000 C CNN
F 2 "" H 5338 4500 50  0001 C CNN
F 3 "~" H 5300 4650 50  0001 C CNN
	1    5300 4650
	0    1    1    0   
$EndComp
$Comp
L Device:C C?
U 1 1 6055A9DD
P 5300 4850
F 0 "C?" V 5048 4850 50  0000 C CNN
F 1 "56pF" V 5139 4850 50  0000 C CNN
F 2 "" H 5338 4700 50  0001 C CNN
F 3 "~" H 5300 4850 50  0001 C CNN
	1    5300 4850
	0    1    1    0   
$EndComp
Wire Wire Line
	5450 4650 5450 4750
$Comp
L power:GND #PWR?
U 1 1 60567CC3
P 5550 4750
F 0 "#PWR?" H 5550 4500 50  0001 C CNN
F 1 "GND" H 5555 4577 50  0000 C CNN
F 2 "" H 5550 4750 50  0001 C CNN
F 3 "" H 5550 4750 50  0001 C CNN
	1    5550 4750
	1    0    0    -1  
$EndComp
Wire Wire Line
	5550 4750 5450 4750
Connection ~ 5450 4750
Wire Wire Line
	5450 4750 5450 4850
Wire Wire Line
	4900 4650 4900 4750
Wire Wire Line
	5150 4850 5150 4750
Wire Wire Line
	5150 4750 4900 4750
Connection ~ 5150 4750
Wire Wire Line
	5150 4750 5150 4650
Connection ~ 4900 4750
Wire Wire Line
	4900 4750 4900 5150
Text Notes 5050 5050 0    50   ~ 0
Smoothing caps
Wire Wire Line
	4200 7750 4050 7750
Text Notes 15450 11050 0    50   ~ 0
0.1 alpha
$Comp
L 74xx:74HC04 U11
U 6 1 605236EF
P 2950 4850
F 0 "U11" V 2904 5030 50  0000 L CNN
F 1 "74LS32" V 2995 5030 50  0000 L CNN
F 2 "" H 2950 4850 50  0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS32" H 2950 4850 50  0001 C CNN
	6    2950 4850
	0    1    1    0   
$EndComp
Wire Wire Line
	4100 4800 4000 4800
Connection ~ 4100 4800
Connection ~ 4100 4700
Wire Wire Line
	4100 4700 4100 4800
Wire Wire Line
	4200 4800 4100 4800
Wire Wire Line
	4500 4350 4650 4350
Connection ~ 4100 4350
Wire Wire Line
	4200 4350 4100 4350
$Comp
L Device:R R?
U 1 1 60584118
P 4350 4350
F 0 "R?" H 4420 4396 50  0000 L CNN
F 1 "270k" H 4420 4305 50  0000 L CNN
F 2 "" V 4280 4350 50  0001 C CNN
F 3 "~" H 4350 4350 50  0001 C CNN
	1    4350 4350
	0    1    1    0   
$EndComp
Text Notes 3300 4150 0    50   ~ 0
Reset circuit with\ndebouncing and\npower-on-reset
Wire Wire Line
	4100 5400 4100 5450
Connection ~ 3600 4350
Wire Wire Line
	3600 4350 3600 4700
Wire Wire Line
	3600 4350 3450 4350
$Comp
L power:GND #PWR?
U 1 1 605315B7
P 3450 4350
F 0 "#PWR?" H 3450 4100 50  0001 C CNN
F 1 "GND" H 3455 4177 50  0000 C CNN
F 2 "" H 3450 4350 50  0001 C CNN
F 3 "" H 3450 4350 50  0001 C CNN
	1    3450 4350
	1    0    0    -1  
$EndComp
$Comp
L power:VCC #PWR?
U 1 1 60530F78
P 4650 4350
F 0 "#PWR?" H 4650 4200 50  0001 C CNN
F 1 "VCC" H 4667 4523 50  0000 C CNN
F 2 "" H 4650 4350 50  0001 C CNN
F 3 "" H 4650 4350 50  0001 C CNN
	1    4650 4350
	1    0    0    -1  
$EndComp
Wire Wire Line
	3650 4700 3600 4700
Wire Wire Line
	4100 4350 4000 4350
Wire Wire Line
	4100 4700 4100 4350
Wire Wire Line
	3950 4700 4100 4700
$Comp
L Device:C C?
U 1 1 6052B4C4
P 3800 4700
F 0 "C?" H 3915 4746 50  0000 L CNN
F 1 "10uF" H 3915 4655 50  0000 L CNN
F 2 "" H 3838 4550 50  0001 C CNN
F 3 "~" H 3800 4700 50  0001 C CNN
	1    3800 4700
	0    1    1    0   
$EndComp
$Comp
L Switch:SW_Push SW1
U 1 1 60528DA4
P 3800 4350
F 0 "SW1" V 3800 4302 50  0000 R CNN
F 1 "SW_Push" V 3755 4302 50  0001 R CNN
F 2 "" H 3800 4550 50  0001 C CNN
F 3 "" H 3800 4550 50  0001 C CNN
	1    3800 4350
	1    0    0    -1  
$EndComp
$Comp
L 74xx:74LS32 U10
U 4 1 6051C888
P 4100 5100
F 0 "U10" H 4100 5425 50  0000 C CNN
F 1 "74LS32" H 4100 5334 50  0000 C CNN
F 2 "" H 4100 5100 50  0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS32" H 4100 5100 50  0001 C CNN
	4    4100 5100
	0    1    1    0   
$EndComp
$Comp
L Device:C C?
U 1 1 605648D0
P 1850 4550
F 0 "C?" V 1598 4550 50  0000 C CNN
F 1 "30pF" V 1689 4550 50  0000 C CNN
F 2 "" H 1888 4400 50  0001 C CNN
F 3 "~" H 1850 4550 50  0001 C CNN
	1    1850 4550
	0    1    1    0   
$EndComp
$Comp
L Device:C C?
U 1 1 60567676
P 1850 5150
F 0 "C?" V 1598 5150 50  0000 C CNN
F 1 "30pF" V 1689 5150 50  0000 C CNN
F 2 "" H 1888 5000 50  0001 C CNN
F 3 "~" H 1850 5150 50  0001 C CNN
	1    1850 5150
	0    1    1    0   
$EndComp
$Comp
L power:GND #PWR?
U 1 1 6056B22E
P 1600 4550
F 0 "#PWR?" H 1600 4300 50  0001 C CNN
F 1 "GND" H 1605 4377 50  0000 C CNN
F 2 "" H 1600 4550 50  0001 C CNN
F 3 "" H 1600 4550 50  0001 C CNN
	1    1600 4550
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR?
U 1 1 6056C411
P 1600 5150
F 0 "#PWR?" H 1600 4900 50  0001 C CNN
F 1 "GND" H 1605 4977 50  0000 C CNN
F 2 "" H 1600 5150 50  0001 C CNN
F 3 "" H 1600 5150 50  0001 C CNN
	1    1600 5150
	1    0    0    -1  
$EndComp
Wire Wire Line
	1600 5150 1700 5150
Wire Wire Line
	1600 4550 1700 4550
$Comp
L Device:R R?
U 1 1 60581F4C
P 2150 4850
F 0 "R?" H 2220 4896 50  0000 L CNN
F 1 "3,3M" H 2220 4805 50  0000 L CNN
F 2 "" V 2080 4850 50  0001 C CNN
F 3 "~" H 2150 4850 50  0001 C CNN
	1    2150 4850
	1    0    0    -1  
$EndComp
$Comp
L Device:Crystal Y?
U 1 1 6058BCE7
P 2500 4850
F 0 "Y?" V 2454 4981 50  0000 L CNN
F 1 "4Mhz" V 2545 4981 50  0000 L CNN
F 2 "" H 2500 4850 50  0001 C CNN
F 3 "~" H 2500 4850 50  0001 C CNN
	1    2500 4850
	0    1    1    0   
$EndComp
Wire Wire Line
	2000 4550 2150 4550
Wire Wire Line
	2500 4700 2500 4550
Connection ~ 2500 4550
Wire Wire Line
	2500 4550 2950 4550
Wire Wire Line
	2150 4700 2150 4550
Connection ~ 2150 4550
Wire Wire Line
	2150 4550 2500 4550
Wire Wire Line
	2000 5150 2150 5150
Wire Wire Line
	2150 5000 2150 5150
Connection ~ 2150 5150
Wire Wire Line
	2150 5150 2500 5150
Wire Wire Line
	2500 5000 2500 5150
Connection ~ 2500 5150
Wire Wire Line
	2500 5150 2950 5150
Text Notes 2100 5350 0    50   ~ 0
System clock\n    4Mhz
$Comp
L 74xx:74HC04 U11
U 5 1 605A807A
P 2950 5450
F 0 "U11" V 2904 5630 50  0000 L CNN
F 1 "74LS32" V 2995 5630 50  0000 L CNN
F 2 "" H 2950 5450 50  0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS32" H 2950 5450 50  0001 C CNN
	5    2950 5450
	0    1    1    0   
$EndComp
Wire Wire Line
	4100 5450 4200 5450
Connection ~ 2950 5150
Wire Wire Line
	4200 5750 2950 5750
$Comp
L Device:C C?
U 1 1 606345AE
P 7100 5800
F 0 "C?" V 6848 5800 50  0000 C CNN
F 1 "100nF" V 6939 5800 50  0000 C CNN
F 2 "" H 7138 5650 50  0001 C CNN
F 3 "~" H 7100 5800 50  0001 C CNN
	1    7100 5800
	0    -1   -1   0   
$EndComp
$Comp
L Device:C C?
U 1 1 606345B4
P 7100 5600
F 0 "C?" V 6848 5600 50  0000 C CNN
F 1 "56pF" V 6939 5600 50  0000 C CNN
F 2 "" H 7138 5450 50  0001 C CNN
F 3 "~" H 7100 5600 50  0001 C CNN
	1    7100 5600
	0    -1   -1   0   
$EndComp
Wire Wire Line
	6950 5800 6950 5700
$Comp
L power:GND #PWR?
U 1 1 606345BB
P 6850 5700
F 0 "#PWR?" H 6850 5450 50  0001 C CNN
F 1 "GND" H 6855 5527 50  0000 C CNN
F 2 "" H 6850 5700 50  0001 C CNN
F 3 "" H 6850 5700 50  0001 C CNN
	1    6850 5700
	-1   0    0    1   
$EndComp
Wire Wire Line
	6850 5700 6950 5700
Connection ~ 6950 5700
Wire Wire Line
	6950 5700 6950 5600
Wire Wire Line
	7250 5600 7250 5700
Wire Wire Line
	7250 5700 7500 5700
Connection ~ 7250 5700
Wire Wire Line
	7250 5700 7250 5800
Text Notes 7350 5450 2    50   ~ 0
Smoothing caps
$Comp
L Device:C C?
U 1 1 60649CA8
P 7250 7350
F 0 "C?" V 6998 7350 50  0000 C CNN
F 1 "100nF" V 7089 7350 50  0000 C CNN
F 2 "" H 7288 7200 50  0001 C CNN
F 3 "~" H 7250 7350 50  0001 C CNN
	1    7250 7350
	0    -1   -1   0   
$EndComp
$Comp
L Device:C C?
U 1 1 60649CAE
P 7250 7150
F 0 "C?" V 6998 7150 50  0000 C CNN
F 1 "56pF" V 7089 7150 50  0000 C CNN
F 2 "" H 7288 7000 50  0001 C CNN
F 3 "~" H 7250 7150 50  0001 C CNN
	1    7250 7150
	0    -1   -1   0   
$EndComp
Wire Wire Line
	7100 7350 7100 7250
$Comp
L power:GND #PWR?
U 1 1 60649CB5
P 7000 7250
F 0 "#PWR?" H 7000 7000 50  0001 C CNN
F 1 "GND" H 7005 7077 50  0000 C CNN
F 2 "" H 7000 7250 50  0001 C CNN
F 3 "" H 7000 7250 50  0001 C CNN
	1    7000 7250
	-1   0    0    1   
$EndComp
Wire Wire Line
	7000 7250 7100 7250
Connection ~ 7100 7250
Wire Wire Line
	7100 7250 7100 7150
Wire Wire Line
	7400 7150 7400 7250
Wire Wire Line
	7400 7250 7500 7250
Connection ~ 7400 7250
Wire Wire Line
	7400 7250 7400 7350
Connection ~ 7500 7250
$Comp
L Device:R R?
U 1 1 60661B57
P 2500 6050
F 0 "R?" V 2293 6050 50  0000 C CNN
F 1 "10k" V 2384 6050 50  0000 C CNN
F 2 "" V 2430 6050 50  0001 C CNN
F 3 "~" H 2500 6050 50  0001 C CNN
	1    2500 6050
	0    1    1    0   
$EndComp
$Comp
L Device:R R?
U 1 1 60662809
P 2200 6150
F 0 "R?" V 1993 6150 50  0000 C CNN
F 1 "10k" V 2084 6150 50  0000 C CNN
F 2 "" V 2130 6150 50  0001 C CNN
F 3 "~" H 2200 6150 50  0001 C CNN
	1    2200 6150
	0    1    1    0   
$EndComp
$Comp
L power:VCC #PWR?
U 1 1 60663175
P 2050 5800
F 0 "#PWR?" H 2050 5650 50  0001 C CNN
F 1 "VCC" H 2067 5973 50  0000 C CNN
F 2 "" H 2050 5800 50  0001 C CNN
F 3 "" H 2050 5800 50  0001 C CNN
	1    2050 5800
	1    0    0    -1  
$EndComp
Wire Wire Line
	2050 5800 2050 6050
Wire Wire Line
	2350 6050 2050 6050
Connection ~ 2050 6050
Wire Wire Line
	2050 6050 2050 6150
Wire Wire Line
	2650 6050 4200 6050
Wire Wire Line
	2350 6150 3050 6150
$Comp
L Switch:SW_Push SW?
U 1 1 6067F418
P 1600 6250
F 0 "SW?" H 1600 6535 50  0000 C CNN
F 1 "Break" H 1600 6444 50  0000 C CNN
F 2 "" H 1600 6450 50  0001 C CNN
F 3 "" H 1600 6450 50  0001 C CNN
	1    1600 6250
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR?
U 1 1 60681E2A
P 1300 6250
F 0 "#PWR?" H 1300 6000 50  0001 C CNN
F 1 "GND" H 1305 6077 50  0000 C CNN
F 2 "" H 1300 6250 50  0001 C CNN
F 3 "" H 1300 6250 50  0001 C CNN
	1    1300 6250
	1    0    0    -1  
$EndComp
$Comp
L Device:C C?
U 1 1 6068233C
P 1600 5800
F 0 "C?" V 1348 5800 50  0000 C CNN
F 1 "10uF" V 1439 5800 50  0000 C CNN
F 2 "" H 1638 5650 50  0001 C CNN
F 3 "~" H 1600 5800 50  0001 C CNN
	1    1600 5800
	0    1    1    0   
$EndComp
Wire Wire Line
	1450 5800 1400 5800
Wire Wire Line
	1400 5800 1400 6250
Wire Wire Line
	1300 6250 1400 6250
Connection ~ 1400 6250
Wire Wire Line
	1750 5800 1800 5800
Wire Wire Line
	1800 5800 1800 6250
Wire Wire Line
	1800 6250 3050 6250
Wire Wire Line
	3050 6250 3050 6150
Connection ~ 1800 6250
Connection ~ 3050 6150
Wire Wire Line
	3050 6150 4200 6150
Text Notes 1250 6700 0    50   ~ 0
"Break" button
$Comp
L Connector:Conn_01x01_Male J?
U 1 1 606A5B44
P 4100 3900
F 0 "J?" V 4162 3944 50  0000 L CNN
F 1 "panel_btn_rst" V 4253 3944 50  0000 L CNN
F 2 "" H 4100 3900 50  0001 C CNN
F 3 "~" H 4100 3900 50  0001 C CNN
	1    4100 3900
	0    1    1    0   
$EndComp
Wire Wire Line
	4100 4100 4100 4350
$Comp
L Connector:Conn_01x01_Male J?
U 1 1 606C1179
P 1800 6550
F 0 "J?" V 1954 6462 50  0000 R CNN
F 1 "panel_btn_brk" V 1863 6462 50  0000 R CNN
F 2 "" H 1800 6550 50  0001 C CNN
F 3 "~" H 1800 6550 50  0001 C CNN
	1    1800 6550
	0    -1   -1   0   
$EndComp
Wire Wire Line
	1800 6350 1800 6250
$Comp
L Device:LED D?
U 1 1 606D4ECC
P 3050 6750
F 0 "D?" H 3043 6495 50  0000 C CNN
F 1 "LED" H 3043 6586 50  0000 C CNN
F 2 "" H 3050 6750 50  0001 C CNN
F 3 "~" H 3050 6750 50  0001 C CNN
	1    3050 6750
	-1   0    0    1   
$EndComp
Wire Wire Line
	3200 6750 3350 6750
$Comp
L Device:R R?
U 1 1 606E9AF9
P 2750 6750
F 0 "R?" V 2543 6750 50  0000 C CNN
F 1 "470" V 2634 6750 50  0000 C CNN
F 2 "" V 2680 6750 50  0001 C CNN
F 3 "~" H 2750 6750 50  0001 C CNN
	1    2750 6750
	0    1    1    0   
$EndComp
$Comp
L power:VCC #PWR?
U 1 1 606EA531
P 2500 6750
F 0 "#PWR?" H 2500 6600 50  0001 C CNN
F 1 "VCC" H 2517 6923 50  0000 C CNN
F 2 "" H 2500 6750 50  0001 C CNN
F 3 "" H 2500 6750 50  0001 C CNN
	1    2500 6750
	1    0    0    -1  
$EndComp
Wire Wire Line
	2500 6750 2600 6750
$Comp
L Connector:Conn_01x01_Male J?
U 1 1 60701566
P 3350 6350
F 0 "J?" V 3412 6394 50  0000 L CNN
F 1 "panel_led_halt" V 3503 6394 50  0000 L CNN
F 2 "" H 3350 6350 50  0001 C CNN
F 3 "~" H 3350 6350 50  0001 C CNN
	1    3350 6350
	0    1    1    0   
$EndComp
Wire Wire Line
	3350 6550 3350 6750
Connection ~ 3350 6750
Wire Wire Line
	3350 6750 4200 6750
NoConn ~ 4200 6550
NoConn ~ 4200 6450
NoConn ~ 4200 7350
NoConn ~ 4200 7850
Wire Bus Line
	6000 7050 6550 7050
Wire Bus Line
	6550 7050 6550 6300
Wire Bus Line
	6550 7850 6550 7050
Connection ~ 6550 7050
Connection ~ 7500 5700
Entry Wire Line
	7200 3650 7100 3550
Entry Wire Line
	7200 3550 7100 3450
Entry Wire Line
	7200 3450 7100 3350
Entry Wire Line
	7200 3350 7100 3250
Entry Wire Line
	7200 3250 7100 3150
Entry Wire Line
	7200 3150 7100 3050
Entry Wire Line
	7200 3050 7100 2950
Entry Wire Line
	7200 2950 7100 2850
Entry Wire Line
	7200 2850 7100 2750
Entry Wire Line
	7200 2750 7100 2650
Entry Wire Line
	7200 2650 7100 2550
Entry Wire Line
	7200 2550 7100 2450
Entry Wire Line
	7200 2450 7100 2350
Entry Wire Line
	7200 2350 7100 2250
Entry Wire Line
	7200 2250 7100 2150
Wire Wire Line
	7500 3750 7200 3750
Wire Wire Line
	7500 3650 7200 3650
Wire Wire Line
	7500 3550 7200 3550
Wire Wire Line
	7500 3450 7200 3450
Wire Wire Line
	7500 3350 7200 3350
Wire Wire Line
	7500 2950 7200 2950
Wire Wire Line
	7500 2850 7200 2850
Wire Wire Line
	7500 2750 7200 2750
Wire Wire Line
	7500 2650 7200 2650
Wire Wire Line
	7500 2550 7200 2550
Wire Wire Line
	7500 2450 7200 2450
Wire Wire Line
	7500 2350 7200 2350
Text Label 7400 3750 2    50   ~ 0
A0
Text Label 7400 3650 2    50   ~ 0
A1
Text Label 7400 3550 2    50   ~ 0
A2
Text Label 7400 3450 2    50   ~ 0
A3
Text Label 7400 3350 2    50   ~ 0
A4
Text Label 7400 3250 2    50   ~ 0
A5
Text Label 7400 3150 2    50   ~ 0
A6
Text Label 7400 3050 2    50   ~ 0
A7
Text Label 7400 2950 2    50   ~ 0
A8
Text Label 7400 2850 2    50   ~ 0
A9
Text Label 7400 2750 2    50   ~ 0
A10
Text Label 7400 2650 2    50   ~ 0
A11
Text Label 7400 2550 2    50   ~ 0
A12
Text Label 7400 2450 2    50   ~ 0
A13
Text Label 7400 2350 2    50   ~ 0
A14
Text Label 7400 2250 2    50   ~ 0
A15
Entry Wire Line
	7200 3750 7100 3650
Connection ~ 6550 6300
Wire Bus Line
	7100 2150 6550 2150
Wire Bus Line
	6550 6300 6550 2150
Text HLabel 4200 7450 0    50   Output ~ 0
IORQ
Text Notes 9300 2350 0    50   ~ 0
Memory decoding logic
Text HLabel 8850 1950 0    50   Input ~ 0
IORQ
$Comp
L 74xx:74HC04 U11
U 2 1 60689B1C
P 9150 2000
F 0 "U11" H 9150 2317 50  0000 C CNN
F 1 "74LS32" H 9150 2226 50  0000 C CNN
F 2 "" H 9150 2000 50  0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS32" H 9150 2000 50  0001 C CNN
	2    9150 2000
	1    0    0    -1  
$EndComp
Wire Wire Line
	8850 1000 8850 1200
Wire Wire Line
	7200 2250 8500 2250
$Comp
L 74xx:74HC04 U11
U 1 1 6054CE0E
P 9150 1000
F 0 "U11" H 9150 1317 50  0000 C CNN
F 1 "74HC04" H 9150 1226 50  0000 C CNN
F 2 "" H 9150 1000 50  0001 C CNN
F 3 "http://www.nxp.com/documents/data_sheet/74HC_HCT04.pdf" H 9150 1000 50  0001 C CNN
	1    9150 1000
	1    0    0    -1  
$EndComp
Wire Wire Line
	8500 2250 8500 1200
Wire Wire Line
	8500 1200 8850 1200
Connection ~ 8850 1200
Wire Wire Line
	8850 1200 8850 1400
$Comp
L 74xx:74LS32 U10
U 1 1 60716E05
P 10800 1900
F 0 "U10" H 10800 1583 50  0000 C CNN
F 1 "74LS32" H 10800 1674 50  0000 C CNN
F 2 "" H 10800 1900 50  0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS32" H 10800 1900 50  0001 C CNN
	1    10800 1900
	1    0    0    1   
$EndComp
Wire Wire Line
	9450 1000 10250 1000
Wire Wire Line
	10250 1000 10250 1800
Wire Wire Line
	10250 1800 10500 1800
Wire Wire Line
	9450 2000 9850 2000
$Comp
L 74xx:74LS32 U10
U 2 1 606614CA
P 9150 1500
F 0 "U10" H 9150 1183 50  0000 C CNN
F 1 "74LS32" H 9150 1274 50  0000 C CNN
F 2 "" H 9150 1500 50  0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS32" H 9150 1500 50  0001 C CNN
	2    9150 1500
	1    0    0    1   
$EndComp
Wire Wire Line
	8850 1600 8850 1800
Wire Wire Line
	8850 1800 9850 1800
Wire Wire Line
	9850 1800 9850 2000
Connection ~ 9850 2000
Wire Wire Line
	9850 2000 10500 2000
Text HLabel 11100 1900 2    50   Output ~ 0
RAMEN
Text HLabel 9450 1500 2    50   Output ~ 0
ROMEN
Text HLabel 9500 7850 3    50   Input ~ 0
RAMEN
Wire Wire Line
	9500 7650 9500 7850
Text HLabel 9500 6300 3    50   Input ~ 0
ROMEN
Wire Wire Line
	9500 6100 9500 6300
Text HLabel 4200 7150 0    50   Output ~ 0
RD
Text HLabel 4200 7250 0    50   Output ~ 0
WR
Text HLabel 9400 6300 3    50   Input ~ 0
RD
Text HLabel 9300 6300 3    50   Input ~ 0
WR
Wire Wire Line
	9300 6300 9300 6100
Wire Wire Line
	9400 6300 9400 6100
Text HLabel 9400 7850 3    50   Input ~ 0
RD
Text HLabel 9300 7850 3    50   Input ~ 0
WR
Wire Wire Line
	9300 7850 9300 7650
Wire Wire Line
	9400 7850 9400 7650
Text Notes 12650 3550 0    50   ~ 0
I/O Decoding logic
Text Notes 8500 8600 0    50   ~ 0
Memory
$Comp
L 74xx:74LS138 U?
U 1 1 60832D85
P 12450 2800
F 0 "U?" H 12450 3581 50  0000 C CNN
F 1 "74LS138" H 12450 3490 50  0000 C CNN
F 2 "" H 12450 2800 50  0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS138" H 12450 2800 50  0001 C CNN
	1    12450 2800
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR?
U 1 1 608389FF
P 12450 3500
F 0 "#PWR?" H 12450 3250 50  0001 C CNN
F 1 "GND" H 12455 3327 50  0000 C CNN
F 2 "" H 12450 3500 50  0001 C CNN
F 3 "" H 12450 3500 50  0001 C CNN
	1    12450 3500
	1    0    0    -1  
$EndComp
$Comp
L power:VCC #PWR?
U 1 1 6084DC47
P 12450 1700
F 0 "#PWR?" H 12450 1550 50  0001 C CNN
F 1 "VCC" H 12467 1873 50  0000 C CNN
F 2 "" H 12450 1700 50  0001 C CNN
F 3 "" H 12450 1700 50  0001 C CNN
	1    12450 1700
	1    0    0    -1  
$EndComp
$Comp
L Device:C C?
U 1 1 6084DC4D
P 12850 1700
F 0 "C?" V 12598 1700 50  0000 C CNN
F 1 "100nF" V 12689 1700 50  0000 C CNN
F 2 "" H 12888 1550 50  0001 C CNN
F 3 "~" H 12850 1700 50  0001 C CNN
	1    12850 1700
	0    1    1    0   
$EndComp
$Comp
L Device:C C?
U 1 1 6084DC53
P 12850 1900
F 0 "C?" V 12598 1900 50  0000 C CNN
F 1 "56pF" V 12689 1900 50  0000 C CNN
F 2 "" H 12888 1750 50  0001 C CNN
F 3 "~" H 12850 1900 50  0001 C CNN
	1    12850 1900
	0    1    1    0   
$EndComp
Wire Wire Line
	13000 1700 13000 1800
$Comp
L power:GND #PWR?
U 1 1 6084DC5A
P 13100 1800
F 0 "#PWR?" H 13100 1550 50  0001 C CNN
F 1 "GND" H 13105 1627 50  0000 C CNN
F 2 "" H 13100 1800 50  0001 C CNN
F 3 "" H 13100 1800 50  0001 C CNN
	1    13100 1800
	1    0    0    -1  
$EndComp
Wire Wire Line
	13100 1800 13000 1800
Connection ~ 13000 1800
Wire Wire Line
	13000 1800 13000 1900
Wire Wire Line
	12450 1700 12450 1800
Wire Wire Line
	12700 1900 12700 1800
Wire Wire Line
	12700 1800 12450 1800
Connection ~ 12700 1800
Wire Wire Line
	12700 1800 12700 1700
Connection ~ 12450 1800
Wire Wire Line
	12450 1800 12450 2200
Text Notes 12600 2100 0    50   ~ 0
Smoothing caps
Wire Wire Line
	11950 2500 8000 2500
Wire Wire Line
	8000 2500 8000 3250
Wire Wire Line
	7200 3250 8000 3250
Wire Wire Line
	11950 2600 8150 2600
Wire Wire Line
	8150 2600 8150 3150
Wire Wire Line
	7200 3150 8150 3150
Wire Wire Line
	11950 2700 8300 2700
Wire Wire Line
	8300 2700 8300 3050
Wire Wire Line
	7200 3050 8300 3050
Wire Wire Line
	11950 3200 11950 3150
Text HLabel 11650 3150 0    50   Input ~ 0
IORQ
Wire Wire Line
	11650 3150 11950 3150
Connection ~ 11950 3150
Wire Wire Line
	11950 3150 11950 3100
$Comp
L power:VCC #PWR?
U 1 1 608D60DB
P 11650 3000
F 0 "#PWR?" H 11650 2850 50  0001 C CNN
F 1 "VCC" H 11667 3173 50  0000 C CNN
F 2 "" H 11650 3000 50  0001 C CNN
F 3 "" H 11650 3000 50  0001 C CNN
	1    11650 3000
	1    0    0    -1  
$EndComp
Wire Wire Line
	11650 3000 11950 3000
Wire Wire Line
	12950 2500 14050 2500
Entry Wire Line
	14050 2500 14150 2600
Wire Wire Line
	12950 2600 14050 2600
Entry Wire Line
	14050 2600 14150 2700
Wire Wire Line
	12950 2700 14050 2700
Entry Wire Line
	14050 2700 14150 2800
Wire Wire Line
	12950 2800 14050 2800
Entry Wire Line
	14050 2800 14150 2900
Wire Wire Line
	12950 2900 14050 2900
Entry Wire Line
	14050 2900 14150 3000
Wire Wire Line
	12950 3000 14050 3000
Entry Wire Line
	14050 3000 14150 3100
Wire Wire Line
	12950 3100 14050 3100
Entry Wire Line
	14050 3100 14150 3200
Wire Wire Line
	12950 3200 14050 3200
Entry Wire Line
	14050 3200 14150 3300
Text GLabel 14150 4650 3    50   BiDi ~ 0
IOBUS
Text Label 12950 2500 0    50   ~ 0
IOEN0
Text Label 12950 2600 0    50   ~ 0
IOEN1
Text Label 12950 2700 0    50   ~ 0
IOEN2
Text Label 12950 2800 0    50   ~ 0
IOEN3
Text Label 12950 2900 0    50   ~ 0
IOEN4
Text Label 12950 3000 0    50   ~ 0
IOEN5
Text Label 12950 3100 0    50   ~ 0
IOEN6
Text Label 12950 3200 0    50   ~ 0
IOEN7
Wire Bus Line
	7800 5100 10350 5100
Wire Bus Line
	7800 6650 10350 6650
Wire Bus Line
	6000 7250 6000 8350
Wire Bus Line
	14150 2600 14150 4650
Wire Bus Line
	6000 5550 6000 7050
Wire Bus Line
	6550 6300 9000 6300
Wire Bus Line
	6550 7850 9000 7850
Wire Bus Line
	7100 2150 7100 3650
$EndSCHEMATC