zx81.sch

EESchema Schematic File Version 4
LIBS:zx81-cache
EELAYER 29 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 1 1
Title "SINCLAIR ZX81 ISSUE ONE"
Date "2019-07-20"
Rev ""
Comp "Nicolas Robin"
Comment1 ""
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
L Device:R_Network08 RP1
U 1 1 5D26E046
P 4650 2750
F 0 "RP1" H 5038 2796 50  0000 L CNN
F 1 "10k" H 5038 2705 50  0000 L CNN
F 2 "Resistor_THT:R_Array_SIP9" V 5125 2750 50  0001 C CNN
F 3 "~" H 4650 2750 50  0001 C CNN
	1    4650 2750
	1    0    0    -1  
$EndComp
$Comp
L Device:R R14
U 1 1 5D274AB5
P 4250 3950
F 0 "R14" V 4250 3950 50  0000 C CNN
F 1 "470" V 4150 3950 50  0000 C CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 4180 3950 50  0001 C CNN
F 3 "~" H 4250 3950 50  0001 C CNN
	1    4250 3950
	1    0    0    -1  
$EndComp
$Comp
L Device:R R10
U 1 1 5D275761
P 4350 3950
F 0 "R10" V 4350 3950 50  0000 C CNN
F 1 "470" V 4420 3905 50  0001 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 4280 3950 50  0001 C CNN
F 3 "~" H 4350 3950 50  0001 C CNN
	1    4350 3950
	1    0    0    -1  
$EndComp
$Comp
L Device:R R9
U 1 1 5D2759B9
P 4450 3950
F 0 "R9" V 4450 3950 50  0000 C CNN
F 1 "470" V 4520 3905 50  0001 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 4380 3950 50  0001 C CNN
F 3 "~" H 4450 3950 50  0001 C CNN
	1    4450 3950
	1    0    0    -1  
$EndComp
$Comp
L Device:R R8
U 1 1 5D275B93
P 4550 3950
F 0 "R8" V 4550 3950 50  0000 C CNN
F 1 "470" V 4620 3905 50  0001 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 4480 3950 50  0001 C CNN
F 3 "~" H 4550 3950 50  0001 C CNN
	1    4550 3950
	1    0    0    -1  
$EndComp
$Comp
L Device:R R7
U 1 1 5D275D58
P 4650 3950
F 0 "R7" V 4650 3950 50  0000 C CNN
F 1 "470" V 4720 3905 50  0001 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 4580 3950 50  0001 C CNN
F 3 "~" H 4650 3950 50  0001 C CNN
	1    4650 3950
	1    0    0    -1  
$EndComp
$Comp
L Device:R R11
U 1 1 5D275F32
P 4750 3950
F 0 "R11" V 4750 3950 50  0000 C CNN
F 1 "470" V 4820 3905 50  0001 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 4680 3950 50  0001 C CNN
F 3 "~" H 4750 3950 50  0001 C CNN
	1    4750 3950
	1    0    0    -1  
$EndComp
$Comp
L Device:R R12
U 1 1 5D27619F
P 4850 3950
F 0 "R12" V 4850 3950 50  0000 C CNN
F 1 "470" V 4920 3905 50  0001 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 4780 3950 50  0001 C CNN
F 3 "~" H 4850 3950 50  0001 C CNN
	1    4850 3950
	1    0    0    -1  
$EndComp
$Comp
L Device:R R13
U 1 1 5D27B057
P 4950 3950
F 0 "R13" V 4950 3950 50  0000 C CNN
F 1 "470" V 5020 3905 50  0001 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 4880 3950 50  0001 C CNN
F 3 "~" H 4950 3950 50  0001 C CNN
	1    4950 3950
	1    0    0    -1  
$EndComp
Wire Wire Line
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Wire Wire Line
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Wire Wire Line
	4050 3200 4450 3200
Wire Wire Line
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Wire Wire Line
	4050 3400 4650 3400
Wire Wire Line
	4050 3500 4750 3500
Wire Wire Line
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Wire Wire Line
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Connection ~ 4250 3000
Wire Wire Line
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Connection ~ 4350 3100
Wire Wire Line
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Connection ~ 4450 3200
Wire Wire Line
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Connection ~ 4550 3300
Wire Wire Line
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Connection ~ 4650 3400
Wire Wire Line
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Connection ~ 4750 3500
Wire Wire Line
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Connection ~ 4850 3600
Wire Wire Line
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Connection ~ 4950 3700
Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
	4950 3800 4950 3700
$Comp
L power:GND #PWR0101
U 1 1 5D2C0334
P 7600 3650
F 0 "#PWR0101" H 7600 3400 50  0001 C CNN
F 1 "GND" H 7605 3477 50  0001 C CNN
F 2 "" H 7600 3650 50  0001 C CNN
F 3 "" H 7600 3650 50  0001 C CNN
	1    7600 3650
	1    0    0    -1  
$EndComp
$Comp
L power:+5V #PWR0103
U 1 1 5D2C321F
P 7600 2150
F 0 "#PWR0103" H 7600 2000 50  0001 C CNN
F 1 "+5V" H 7600 2150 50  0000 L CNN
F 2 "" H 7600 2150 50  0001 C CNN
F 3 "" H 7600 2150 50  0001 C CNN
	1    7600 2150
	1    0    0    -1  
$EndComp
$Comp
L Device:R R26
U 1 1 5D2E073A
P 7300 5625
F 0 "R26" V 7300 5625 50  0000 C CNN
F 1 "1k" V 7400 5575 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 7230 5625 50  0001 C CNN
F 3 "~" H 7300 5625 50  0001 C CNN
	1    7300 5625
	0    -1   -1   0   
$EndComp
$Comp
L Device:R R18
U 1 1 5D2E14CE
P 7300 5725
F 0 "R18" V 7300 5725 50  0000 C CNN
F 1 "1k" V 7370 5680 50  0001 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 7230 5725 50  0001 C CNN
F 3 "~" H 7300 5725 50  0001 C CNN
	1    7300 5725
	0    -1   -1   0   
$EndComp
$Comp
L Device:R R19
U 1 1 5D2E20D7
P 7300 5825
F 0 "R19" V 7300 5825 50  0000 C CNN
F 1 "1k" V 7370 5780 50  0001 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 7230 5825 50  0001 C CNN
F 3 "~" H 7300 5825 50  0001 C CNN
	1    7300 5825
	0    -1   -1   0   
$EndComp
$Comp
L Device:R R25
U 1 1 5D2E2CE0
P 7300 5925
F 0 "R25" V 7300 5925 50  0000 C CNN
F 1 "1k" V 7370 5880 50  0001 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 7230 5925 50  0001 C CNN
F 3 "~" H 7300 5925 50  0001 C CNN
	1    7300 5925
	0    -1   -1   0   
$EndComp
$Comp
L Device:R R24
U 1 1 5D2E39A6
P 7300 6025
F 0 "R24" V 7300 6025 50  0000 C CNN
F 1 "1k" V 7370 5980 50  0001 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 7230 6025 50  0001 C CNN
F 3 "~" H 7300 6025 50  0001 C CNN
	1    7300 6025
	0    -1   -1   0   
$EndComp
$Comp
L Device:R R23
U 1 1 5D2E4489
P 7300 6125
F 0 "R23" V 7300 6125 50  0000 C CNN
F 1 "1k" V 7370 6080 50  0001 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 7230 6125 50  0001 C CNN
F 3 "~" H 7300 6125 50  0001 C CNN
	1    7300 6125
	0    -1   -1   0   
$EndComp
$Comp
L Device:R R20
U 1 1 5D2E5092
P 7300 6225
F 0 "R20" V 7300 6225 50  0000 C CNN
F 1 "1k" V 7370 6180 50  0001 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 7230 6225 50  0001 C CNN
F 3 "~" H 7300 6225 50  0001 C CNN
	1    7300 6225
	0    -1   -1   0   
$EndComp
$Comp
L Device:R R21
U 1 1 5D2E5C86
P 7300 6325
F 0 "R21" V 7300 6325 50  0000 C CNN
F 1 "1k" V 7370 6280 50  0001 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 7230 6325 50  0001 C CNN
F 3 "~" H 7300 6325 50  0001 C CNN
	1    7300 6325
	0    -1   -1   0   
$EndComp
$Comp
L Device:R R22
U 1 1 5D2E673F
P 7300 6425
F 0 "R22" V 7300 6425 50  0000 C CNN
F 1 "1k" V 7370 6380 50  0001 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 7230 6425 50  0001 C CNN
F 3 "~" H 7300 6425 50  0001 C CNN
	1    7300 6425
	0    -1   -1   0   
$EndComp
Text Label 6575 5625 0    50   ~ 0
A0'
Text Label 6575 5725 0    50   ~ 0
A1'
Text Label 6575 5825 0    50   ~ 0
A2'
Text Label 6575 5925 0    50   ~ 0
A3'
Text Label 6575 6025 0    50   ~ 0
A4'
Text Label 6575 6125 0    50   ~ 0
A5'
Text Label 6575 6225 0    50   ~ 0
A6'
Text Label 6575 6325 0    50   ~ 0
A7'
Text Label 6575 6425 0    50   ~ 0
A8'
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A12
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Text Label 6500 2150 0    50   ~ 0
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Text Label 6500 2050 0    50   ~ 0
A15
Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Text Label 7300 2550 2    50   ~ 0
A4
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A2
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A9
Text Label 6550 6625 0    50   ~ 0
A10
Text Label 6550 6725 0    50   ~ 0
A11
Text Label 6550 6825 0    50   ~ 0
A12
$Comp
L power:GND #PWR0102
U 1 1 5D2F1A17
P 6150 7025
F 0 "#PWR0102" H 6150 6775 50  0001 C CNN
F 1 "GND" H 6155 6852 50  0001 C CNN
F 2 "" H 6150 7025 50  0001 C CNN
F 3 "" H 6150 7025 50  0001 C CNN
	1    6150 7025
	1    0    0    -1  
$EndComp
$Comp
L power:+5V #PWR0104
U 1 1 5D2F1A1D
P 6150 5425
F 0 "#PWR0104" H 6150 5275 50  0001 C CNN
F 1 "+5V" H 6125 5575 50  0000 C CNN
F 2 "" H 6150 5425 50  0001 C CNN
F 3 "" H 6150 5425 50  0001 C CNN
	1    6150 5425
	1    0    0    -1  
$EndComp
Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Text Label 4250 4100 3    50   ~ 0
D0'
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D1'
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D2'
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D3'
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D4'
Text Label 4750 4100 3    50   ~ 0
D5'
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D6'
Text Label 4950 4100 3    50   ~ 0
D7'
Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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$Comp
L zx81:2114 ICb4
U 1 1 5D330682
P 7600 2950
F 0 "ICb4" H 7600 3250 20  0000 L CNB
F 1 "2114" H 7600 3300 50  0000 L CNN
F 2 "Package_DIP:DIP-18_W7.62mm" H 8950 4400 50  0001 C CNN
F 3 "" H 8950 4400 50  0001 C CNN
F 4 "IC4B" H 7600 3375 50  0000 L CNB "OriginalReference"
	1    7600 2950
	1    0    0    -1  
$EndComp
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A0
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A6
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A7
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A9
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A5
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A3
Text Label 7300 3450 2    50   ~ 0
A1
Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Text Label 7900 2750 0    50   ~ 0
D0'
Text Label 7900 2850 0    50   ~ 0
D1'
Text Label 7900 2950 0    50   ~ 0
D5'
Text Label 7900 3050 0    50   ~ 0
D6'
Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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$Comp
L power:GND #PWR0105
U 1 1 5D388E0F
P 8850 3650
F 0 "#PWR0105" H 8850 3400 50  0001 C CNN
F 1 "GND" H 8855 3477 50  0001 C CNN
F 2 "" H 8850 3650 50  0001 C CNN
F 3 "" H 8850 3650 50  0001 C CNN
	1    8850 3650
	1    0    0    -1  
$EndComp
$Comp
L power:+5V #PWR0106
U 1 1 5D388E15
P 8850 2150
F 0 "#PWR0106" H 8850 2000 50  0001 C CNN
F 1 "+5V" H 8950 2150 50  0000 C CNN
F 2 "" H 8850 2150 50  0001 C CNN
F 3 "" H 8850 2150 50  0001 C CNN
	1    8850 2150
	1    0    0    -1  
$EndComp
Text Label 8550 2550 2    50   ~ 0
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$Comp
L zx81:2114 ICa4
U 1 1 5D388E1D
P 8850 2950
F 0 "ICa4" H 8850 3250 20  0000 L CNB
F 1 "2114" H 8850 3300 50  0000 L CNN
F 2 "Package_DIP:DIP-18_W7.62mm" H 10200 4400 50  0001 C CNN
F 3 "" H 10200 4400 50  0001 C CNN
F 4 "IC4A" H 8850 3375 50  0000 L CNB "OriginalReference"
	1    8850 2950
	1    0    0    -1  
$EndComp
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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D3'
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D7'
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Text Label 10700 3150 0    50   ~ 0
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D5'
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D6'
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Wire Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
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Entry Wire Line
	5500 6125 5600 6225
Entry Wire Line
	5500 6225 5600 6325
Text Label 5750 5625 2    50   ~ 0
D0'
Text Label 5750 5725 2    50   ~ 0
D1'
Text Label 5750 5825 2    50   ~ 0
D2'
Text Label 5750 5925 2    50   ~ 0
D3'
Text Label 5750 6025 2    50   ~ 0
D4'
Text Label 5750 6125 2    50   ~ 0
D5'
Text Label 5750 6225 2    50   ~ 0
D6'
Text Label 5750 6325 2    50   ~ 0
D7'
$Comp
L Device:R R28
U 1 1 5D503BAE
P 5250 6625
F 0 "R28" V 5250 6625 50  0000 C CNN
F 1 "680" V 5150 6625 50  0000 C CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 5180 6625 50  0001 C CNN
F 3 "~" H 5250 6625 50  0001 C CNN
	1    5250 6625
	0    -1   -1   0   
$EndComp
Text Label 3850 4475 3    50   ~ 0
A0'
Text Label 3750 4475 3    50   ~ 0
A1'
Text Label 3650 4475 3    50   ~ 0
A2'
Text Label 3550 4475 3    50   ~ 0
A3'
Text Label 3450 4475 3    50   ~ 0
A4'
Text Label 3350 4475 3    50   ~ 0
A5'
Text Label 3250 4475 3    50   ~ 0
A6'
Text Label 3150 4475 3    50   ~ 0
A7'
Text Label 3050 4475 3    50   ~ 0
A8'
Text Label 2950 4475 3    50   ~ 0
A14
Text Label 2850 4475 3    50   ~ 0
A15
Entry Wire Line
	2850 4700 2950 4800
Entry Wire Line
	2950 4700 3050 4800
Entry Wire Line
	3050 4650 3150 4750
Entry Wire Line
	3150 4650 3250 4750
Entry Wire Line
	3250 4650 3350 4750
Entry Wire Line
	3350 4650 3450 4750
Entry Wire Line
	3450 4650 3550 4750
Entry Wire Line
	3550 4650 3650 4750
Entry Wire Line
	3650 4650 3750 4750
Entry Wire Line
	3750 4650 3850 4750
Entry Wire Line
	3850 4650 3950 4750
Wire Bus Line
	2950 4800 3050 4800
$Comp
L Regulator_Linear:L7805 REG1
U 1 1 5D27FFC3
P 2150 5150
F 0 "REG1" H 2150 5392 50  0000 C CNN
F 1 "7805" H 2150 5301 50  0000 C CNN
F 2 "Package_TO_SOT_THT:TO-220-3_Horizontal_TabDown" H 2175 5000 50  0001 L CIN
F 3 "~" H 2150 5100 50  0001 C CNN
	1    2150 5150
	1    0    0    -1  
$EndComp
$Comp
L Device:C_Small C2
U 1 1 5D281DA9
P 2650 5350
F 0 "C2" H 2675 5425 50  0000 L CNN
F 1 "47n" H 2742 5305 50  0001 L CNN
F 2 "Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm" H 2650 5350 50  0001 C CNN
F 3 "~" H 2650 5350 50  0001 C CNN
F 4 "Ceramic disc" H 550 -200 50  0001 C CNN "Comment"
	1    2650 5350
	1    0    0    -1  
$EndComp
$Comp
L Device:C_Small C4
U 1 1 5D28BCC6
P 2900 5350
F 0 "C4" H 2925 5425 50  0000 L CNN
F 1 "47n" H 2992 5305 50  0001 L CNN
F 2 "Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm" H 2900 5350 50  0001 C CNN
F 3 "~" H 2900 5350 50  0001 C CNN
F 4 "Ceramic disc" H 2900 5350 50  0001 C CNN "Comment"
	1    2900 5350
	1    0    0    -1  
$EndComp
$Comp
L Device:C_Small C8
U 1 1 5D293CA4
P 3150 5350
F 0 "C8" H 3175 5425 50  0000 L CNN
F 1 "47n" H 3242 5305 50  0001 L CNN
F 2 "Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm" H 3150 5350 50  0001 C CNN
F 3 "~" H 3150 5350 50  0001 C CNN
F 4 "Ceramic disc" H 550 -200 50  0001 C CNN "Comment"
	1    3150 5350
	1    0    0    -1  
$EndComp
$Comp
L Device:C_Small C9
U 1 1 5D29BA88
P 3400 5350
F 0 "C9" H 3425 5425 50  0000 L CNN
F 1 "47n" H 3492 5305 50  0001 L CNN
F 2 "Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm" H 3400 5350 50  0001 C CNN
F 3 "~" H 3400 5350 50  0001 C CNN
F 4 "Ceramic disc" H 550 -200 50  0001 C CNN "Comment"
	1    3400 5350
	1    0    0    -1  
$EndComp
Wire Wire Line
	3400 5150 3150 5150
Connection ~ 2650 5150
Connection ~ 2900 5150
Wire Wire Line
	2900 5150 2650 5150
Connection ~ 3150 5150
Wire Wire Line
	3150 5150 2900 5150
Wire Wire Line
	1700 5150 1350 5150
$Comp
L power:GND #PWR0107
U 1 1 5D328BDE
P 1350 5575
F 0 "#PWR0107" H 1350 5325 50  0001 C CNN
F 1 "GND" H 1355 5402 50  0001 C CNN
F 2 "" H 1350 5575 50  0001 C CNN
F 3 "" H 1350 5575 50  0001 C CNN
	1    1350 5575
	1    0    0    -1  
$EndComp
Text Notes 725  5025 0    50   ~ 0
+7V to 11V DC
$Comp
L power:+5V #PWR0108
U 1 1 5D33FBA9
P 2650 5100
F 0 "#PWR0108" H 2650 4950 50  0001 C CNN
F 1 "+5V" H 2665 5273 50  0000 C CNN
F 2 "" H 2650 5100 50  0001 C CNN
F 3 "" H 2650 5100 50  0001 C CNN
	1    2650 5100
	1    0    0    -1  
$EndComp
Wire Wire Line
	1850 5150 1700 5150
Connection ~ 1700 5150
Text Notes 2700 5850 0    50   ~ 0
C2/C4 near IC1\nC8 near IC3\nC9 near IC4
$Comp
L power:+5V #PWR0109
U 1 1 5D485ED2
P 4250 2550
F 0 "#PWR0109" H 4250 2400 50  0001 C CNN
F 1 "+5V" H 4350 2600 50  0000 C CNN
F 2 "" H 4250 2550 50  0001 C CNN
F 3 "" H 4250 2550 50  0001 C CNN
	1    4250 2550
	1    0    0    -1  
$EndComp
$Comp
L Device:R R6
U 1 1 5D4A1F8C
P 4400 1900
F 0 "R6" V 4400 1850 25  0000 C CNN
F 1 "2.2k" V 4400 1950 25  0000 C CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 4330 1900 50  0001 C CNN
F 3 "~" H 4400 1900 50  0001 C CNN
	1    4400 1900
	0    1    1    0   
$EndComp
$Comp
L Device:Q_NPN_BCE TR2
U 1 1 5D4AF347
P 4750 1900
F 0 "TR2" H 4800 1900 25  0000 L CNN
F 1 "ZTX313" H 4750 2050 25  0000 C CNN
F 2 "Package_TO_SOT_THT:TO-92Flat" H 4950 2000 50  0001 C CNN
F 3 "~" H 4750 1900 50  0001 C CNN
	1    4750 1900
	1    0    0    -1  
$EndComp
$Comp
L Device:R R5
U 1 1 5D4CA51F
P 5000 1550
F 0 "R5" V 5000 1600 25  0000 C CNN
F 1 "330" V 5000 1500 25  0000 C CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 4930 1550 50  0001 C CNN
F 3 "~" H 5000 1550 50  0001 C CNN
	1    5000 1550
	0    -1   -1   0   
$EndComp
$Comp
L power:+5V #PWR0110
U 1 1 5D4D6E8D
P 5150 1550
F 0 "#PWR0110" H 5150 1400 50  0001 C CNN
F 1 "+5V" H 5250 1600 50  0000 C CNN
F 2 "" H 5150 1550 50  0001 C CNN
F 3 "" H 5150 1550 50  0001 C CNN
	1    5150 1550
	1    0    0    -1  
$EndComp
$Comp
L Device:C_Small C6
U 1 1 5D5B0EED
P 4300 2050
F 0 "C6" V 4250 2100 25  0000 C CNN
F 1 "100p" V 4250 1950 25  0000 C CNN
F 2 "Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm" H 4300 2050 50  0001 C CNN
F 3 "~" H 4300 2050 50  0001 C CNN
F 4 "Ceramic disc" H 0   0   50  0001 C CNN "Comment"
	1    4300 2050
	0    1    1    0   
$EndComp
$Comp
L Device:R R16
U 1 1 5D5BF782
P 6975 3800
F 0 "R16" V 6975 3800 50  0000 C CNN
F 1 "1k" V 6875 3800 50  0001 C CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 6905 3800 50  0001 C CNN
F 3 "~" H 6975 3800 50  0001 C CNN
	1    6975 3800
	1    0    0    -1  
$EndComp
$Comp
L power:+5V #PWR0111
U 1 1 5D5E5D37
P 6975 3650
F 0 "#PWR0111" H 6975 3500 50  0001 C CNN
F 1 "+5V" H 6975 3800 50  0000 C CNN
F 2 "" H 6975 3650 50  0001 C CNN
F 3 "" H 6975 3650 50  0001 C CNN
	1    6975 3650
	1    0    0    -1  
$EndComp
Text Label 6500 3850 0    50   ~ 0
A6
Entry Wire Line
	6750 3850 6850 3950
$Comp
L Connector_Generic:Conn_02x23_Row_Letter_Last J5
U 1 1 5D2C099B
P 9350 1225
F 0 "J5" V 9354 37  50  0001 R CNN
F 1 "Conn_02x23_Row_Letter_Last" V 9445 37  50  0001 R CNN
F 2 "zx81:Edge_Connector" H 9350 1225 50  0001 C CNN
F 3 "~" H 9350 1225 50  0001 C CNN
	1    9350 1225
	0    -1   -1   0   
$EndComp
Text Label 8250 1425 3    50   ~ 0
D7'
Text Label 8350 1425 3    50   ~ 0
~RAMCS'
Text Label 8550 1425 3    50   ~ 0
D0'
Text Label 8650 1425 3    50   ~ 0
D1'
Text Label 8750 1425 3    50   ~ 0
D2'
Text Label 8850 1425 3    50   ~ 0
D6'
Text Label 8950 1425 3    50   ~ 0
D5'
Text Label 9050 1425 3    50   ~ 0
D3'
Text Label 9150 1425 3    50   ~ 0
D4'
Text Label 9250 1425 3    50   ~ 0
~INT
Text Label 9350 1425 3    50   ~ 0
~NMI
Text Label 9450 1425 3    50   ~ 0
~HALT
Text Label 9550 1425 3    50   ~ 0
~MREQ
Text Label 9650 1425 3    50   ~ 0
~IORQ
Text Label 9750 1425 3    50   ~ 0
~RD
Text Label 9950 1425 3    50   ~ 0
~BUSACK
Text Label 10050 1425 3    50   ~ 0
~WAIT
Text Label 10150 1425 3    50   ~ 0
~BUSRQ
Text Label 10250 1425 3    50   ~ 0
~RESET
Text Label 10350 1425 3    50   ~ 0
~M1
Text Label 10450 1425 3    50   ~ 0
~RFSH
Text Label 8250 925  1    50   ~ 0
+5V
Text Label 8350 925  1    50   ~ 0
+9V
Text Label 8550 925  1    50   ~ 0
GND
Text Label 8650 925  1    50   ~ 0
GND
Text Label 8750 925  1    50   ~ 0
~Φ
Text Label 8850 925  1    50   ~ 0
A0
Text Label 8950 925  1    50   ~ 0
A1
Text Label 9050 925  1    50   ~ 0
A2
Text Label 9150 925  1    50   ~ 0
A3
Text Label 9250 925  1    50   ~ 0
A15
Text Label 9350 925  1    50   ~ 0
A14
Text Label 9450 925  1    50   ~ 0
A13
Text Label 9550 925  1    50   ~ 0
A12
Text Label 9650 925  1    50   ~ 0
A11
Text Label 9750 925  1    50   ~ 0
A10
Text Label 9850 925  1    50   ~ 0
A9
Text Label 9950 925  1    50   ~ 0
A8
Text Label 10050 925  1    50   ~ 0
A7
Text Label 10150 925  1    50   ~ 0
A6
Text Label 10250 925  1    50   ~ 0
A5
Text Label 10350 925  1    50   ~ 0
A4
Text Label 10450 925  1    50   ~ 0
~ROMCS'
NoConn ~ 8450 1425
NoConn ~ 8450 925 
$Comp
L Device:R R2
U 1 1 5D29E45F
P 2950 1500
F 0 "R2" V 2950 1500 50  0000 C CNN
F 1 "680" V 2850 1500 50  0000 C CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 2880 1500 50  0001 C CNN
F 3 "~" H 2950 1500 50  0001 C CNN
	1    2950 1500
	-1   0    0    1   
$EndComp
Text Label 2950 1350 1    50   ~ 0
~RAMCS'
Text Label 4050 1900 0    50   ~ 0
~Φ
Text Label 9850 1425 3    50   ~ 0
~WR
Text Notes 8450 925  1    50   ~ 0
KEYWAY
Text Notes 8450 1425 3    50   ~ 0
KEYWAY
Text Notes 10500 1025 0    50   ~ 0
UNDERSIDE
Text Notes 10500 1475 0    50   ~ 0
COMPONENT\nSIDE
$Comp
L Device:R_Network09 RP2
U 1 1 5D3997CA
P 8050 5375
F 0 "RP2" H 7575 5425 50  0000 R CNN
F 1 "NOT USED" H 7575 5350 50  0000 R CNN
F 2 "Resistor_THT:R_Array_SIP10" V 8625 5375 50  0001 C CNN
F 3 "~" H 8050 5375 50  0001 C CNN
	1    8050 5375
	1    0    0    -1  
$EndComp
Wire Wire Line
	7450 5625 7650 5625
Wire Wire Line
	7450 5825 7850 5825
Wire Wire Line
	7450 5925 7950 5925
Wire Wire Line
	7450 6025 8050 6025
Wire Wire Line
	7450 6125 8150 6125
Wire Wire Line
	7450 6225 8250 6225
Wire Wire Line
	7450 6325 8350 6325
Wire Wire Line
	7450 6425 8450 6425
$Comp
L power:+5V #PWR0112
U 1 1 5D4219F4
P 7650 5175
F 0 "#PWR0112" H 7650 5025 50  0001 C CNN
F 1 "+5V" H 7550 5175 50  0000 C CNN
F 2 "" H 7650 5175 50  0001 C CNN
F 3 "" H 7650 5175 50  0001 C CNN
	1    7650 5175
	1    0    0    -1  
$EndComp
Wire Wire Line
	5150 2250 5100 2250
Wire Wire Line
	4400 2100 4400 2050
$Comp
L power:GND #PWR0113
U 1 1 5D59C245
P 5100 2450
F 0 "#PWR0113" H 5100 2200 50  0001 C CNN
F 1 "GND" H 5105 2277 50  0001 C CNN
F 2 "" H 5100 2450 50  0001 C CNN
F 3 "" H 5100 2450 50  0001 C CNN
	1    5100 2450
	1    0    0    -1  
$EndComp
$Comp
L Device:Crystal_Small X1
U 1 1 5D5DF00B
P 4400 2200
F 0 "X1" V 4400 2200 25  0000 C CNN
F 1 "6.5MHz" H 4400 2100 25  0000 C CNN
F 2 "Crystal:Resonator-3Pin_W7.0mm_H2.5mm" H 4400 2200 50  0001 C CNN
F 3 "~" H 4400 2200 50  0001 C CNN
	1    4400 2200
	0    1    1    0   
$EndComp
Wire Wire Line
	4200 1900 4200 1750
Wire Wire Line
	4200 1750 4300 1750
Wire Wire Line
	4500 1750 4550 1750
Wire Wire Line
	4250 1900 4200 1900
Connection ~ 4550 1900
Wire Wire Line
	4550 1900 4550 2000
Wire Wire Line
	4550 1900 4550 1750
Wire Wire Line
	4550 2300 4550 2350
Wire Wire Line
	4400 2300 4400 2350
Connection ~ 4400 2350
Wire Wire Line
	4200 2350 4400 2350
Wire Wire Line
	4400 2350 4550 2350
Wire Wire Line
	4850 2100 4850 2350
Wire Wire Line
	4850 2350 4550 2350
Connection ~ 4550 2350
Wire Wire Line
	4250 2950 4250 3000
Wire Wire Line
	4350 2950 4350 3100
Wire Wire Line
	4450 2950 4450 3200
Wire Wire Line
	4550 2950 4550 3300
Wire Wire Line
	4750 2950 4750 3500
Wire Wire Line
	4850 2950 4850 3600
Wire Wire Line
	4950 2950 4950 3700
Wire Wire Line
	4850 1700 4850 1650
Wire Wire Line
	4050 1950 4050 1900
Wire Wire Line
	4050 1900 4200 1900
Connection ~ 4200 1900
Wire Wire Line
	4050 2050 4200 2050
Connection ~ 4200 2050
$Comp
L power:GND #PWR0114
U 1 1 5D7CDE7A
P 4550 2350
F 0 "#PWR0114" H 4550 2100 50  0001 C CNN
F 1 "GND" H 4555 2177 50  0001 C CNN
F 2 "" H 4550 2350 50  0001 C CNN
F 3 "" H 4550 2350 50  0001 C CNN
	1    4550 2350
	1    0    0    -1  
$EndComp
$Comp
L Device:C_Small C7
U 1 1 5D8312AE
P 4400 1750
F 0 "C7" V 4350 1800 25  0000 C CNN
F 1 "47p" V 4350 1650 25  0000 C CNN
F 2 "Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm" H 4400 1750 50  0001 C CNN
F 3 "~" H 4400 1750 50  0001 C CNN
F 4 "Ceramic disc" H 0   0   50  0001 C CNN "Comment"
	1    4400 1750
	0    1    1    0   
$EndComp
Wire Wire Line
	5350 1650 4850 1650
Connection ~ 4850 1650
Wire Wire Line
	4850 1550 4850 1650
Wire Wire Line
	3750 1650 3750 1400
Wire Wire Line
	3750 1400 5450 1400
Wire Wire Line
	3650 1650 3650 1350
Wire Wire Line
	3650 1350 5550 1350
Wire Wire Line
	3550 1650 3550 1300
Wire Wire Line
	3550 1300 5650 1300
Wire Wire Line
	5650 1300 5650 1650
Wire Wire Line
	3450 1650 3450 1250
Wire Wire Line
	3450 1250 5750 1250
$Comp
L Device:R R15
U 1 1 5D53E37B
P 5100 2050
F 0 "R15" V 5100 2000 25  0000 C CNN
F 1 "220k" V 5100 2100 25  0000 C CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 5030 2050 50  0001 C CNN
F 3 "~" H 5100 2050 50  0001 C CNN
	1    5100 2050
	1    0    0    -1  
$EndComp
$Comp
L Device:R R4
U 1 1 5D5A451C
P 4200 2200
F 0 "R4" V 4200 2250 25  0000 C CNN
F 1 "18k" V 4200 2150 25  0000 C CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 4130 2200 50  0001 C CNN
F 3 "~" H 4200 2200 50  0001 C CNN
	1    4200 2200
	-1   0    0    1   
$EndComp
$Comp
L Device:R R3
U 1 1 5D52495A
P 4550 2150
F 0 "R3" V 4550 2150 25  0000 C CNN
F 1 "not used" V 4600 2150 25  0000 C TNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 4480 2150 50  0001 C CNN
F 3 "~" H 4550 2150 50  0001 C CNN
	1    4550 2150
	1    0    0    -1  
$EndComp
$Comp
L Device:R R1
U 1 1 5D9C456A
P 6300 1050
F 0 "R1" V 6300 1000 25  0000 C CNN
F 1 "10k" V 6300 1100 25  0000 C CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 6230 1050 50  0001 C CNN
F 3 "~" H 6300 1050 50  0001 C CNN
	1    6300 1050
	0    1    1    0   
$EndComp
$Comp
L Device:Q_NPN_BCE TR1
U 1 1 5D9C4570
P 6650 1050
F 0 "TR1" H 6700 1050 25  0000 L CNN
F 1 "ZTX313" H 6650 900 25  0000 C CNN
F 2 "Package_TO_SOT_THT:TO-92Flat" H 6850 1150 50  0001 C CNN
F 3 "~" H 6650 1050 50  0001 C CNN
	1    6650 1050
	1    0    0    -1  
$EndComp
$Comp
L Device:R R17
U 1 1 5D9C4576
P 6950 1100
F 0 "R17" V 6950 1150 25  0000 C CNN
F 1 "1k" V 6950 1050 25  0000 C CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 6880 1100 50  0001 C CNN
F 3 "~" H 6950 1100 50  0001 C CNN
	1    6950 1100
	1    0    0    -1  
$EndComp
Wire Wire Line
	6400 900  6450 900 
Connection ~ 6450 1050
Wire Wire Line
	6450 1050 6450 900 
$Comp
L Device:C_Small C1
U 1 1 5D9C4587
P 6300 900
F 0 "C1" V 6250 950 25  0000 C CNN
F 1 "47p" V 6250 800 25  0000 C CNN
F 2 "Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm" H 6300 900 50  0001 C CNN
F 3 "~" H 6300 900 50  0001 C CNN
F 4 "Ceramic disc" H 0   -100 50  0001 C CNN "Comment"
	1    6300 900 
	0    1    1    0   
$EndComp
$Comp
L power:+5V #PWR0115
U 1 1 5D9EDB58
P 6950 950
F 0 "#PWR0115" H 6950 800 50  0001 C CNN
F 1 "+5V" H 7050 1000 50  0000 C CNN
F 2 "" H 6950 950 50  0001 C CNN
F 3 "" H 6950 950 50  0001 C CNN
	1    6950 950 
	1    0    0    -1  
$EndComp
Wire Wire Line
	6750 850  6850 850 
Wire Wire Line
	6850 850  6850 1250
Wire Wire Line
	6850 1250 6950 1250
Wire Wire Line
	6200 900  6150 900 
Wire Wire Line
	6150 900  6150 1050
$Comp
L power:+5V #PWR0116
U 1 1 5E170E3C
P 5100 1900
F 0 "#PWR0116" H 5100 1750 50  0001 C CNN
F 1 "+5V" H 5100 2050 50  0000 C CNN
F 2 "" H 5100 1900 50  0001 C CNN
F 3 "" H 5100 1900 50  0001 C CNN
	1    5100 1900
	1    0    0    -1  
$EndComp
Text Label 1350 5150 0    50   ~ 0
+9V
$Comp
L Device:R R30
U 1 1 5E1B624F
P 2550 4100
F 0 "R30" V 2550 4100 50  0000 C CNN
F 1 "0" V 2620 4055 50  0001 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 2480 4100 50  0001 C CNN
F 3 "~" H 2550 4100 50  0001 C CNN
	1    2550 4100
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0117
U 1 1 5E1CB288
P 1350 4275
F 0 "#PWR0117" H 1350 4025 50  0001 C CNN
F 1 "GND" H 1355 4102 50  0001 C CNN
F 2 "" H 1350 4275 50  0001 C CNN
F 3 "" H 1350 4275 50  0001 C CNN
	1    1350 4275
	1    0    0    -1  
$EndComp
Wire Wire Line
	2550 3950 2650 3950
Text Notes 2500 4175 2    50   ~ 0
USA\nONLY
$Comp
L Device:R_Small R33
U 1 1 5E1F779A
P 2150 3850
F 0 "R33" V 1954 3850 50  0000 C CNN
F 1 "4.7k" V 2045 3850 50  0000 C CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" H 2150 3850 50  0001 C CNN
F 3 "~" H 2150 3850 50  0001 C CNN
	1    2150 3850
	0    1    1    0   
$EndComp
$Comp
L Device:C_Small C10
U 1 1 5E1F908E
P 1850 3850
F 0 "C10" V 1650 3850 50  0000 C CNN
F 1 "10n" V 1750 3850 50  0000 C CNN
F 2 "Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm" H 1850 3850 50  0001 C CNN
F 3 "~" H 1850 3850 50  0001 C CNN
F 4 "Ceramic disc" H -150 0   50  0001 C CNN "Comment"
	1    1850 3850
	0    1    1    0   
$EndComp
$Comp
L Device:R_Small R34
U 1 1 5E1FA0A3
P 1700 4050
F 0 "R34" H 1500 4100 50  0000 L CNN
F 1 "220" H 1500 4000 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" H 1700 4050 50  0001 C CNN
F 3 "~" H 1700 4050 50  0001 C CNN
	1    1700 4050
	1    0    0    -1  
$EndComp
$Comp
L Connector:AudioJack2 J1
U 1 1 5D2B80BF
P 1150 5150
F 0 "J1" H 971 5133 50  0001 R CNN
F 1 "DC IN" H 970 5179 50  0000 R CNN
F 2 "Connector_Audio:Jack_3.5mm_CUI_SJ1-3533NG_Horizontal" H 1150 5150 50  0001 C CNN
F 3 "~" H 1150 5150 50  0001 C CNN
	1    1150 5150
	1    0    0    1   
$EndComp
$Comp
L Connector:AudioJack2 J2
U 1 1 5D2FF064
P 1150 3850
F 0 "J2" H 971 3833 50  0001 R CNN
F 1 "EAR" H 970 3879 50  0000 R CNN
F 2 "Connector_Audio:Jack_3.5mm_CUI_SJ1-3533NG_Horizontal" H 1150 3850 50  0001 C CNN
F 3 "~" H 1150 3850 50  0001 C CNN
	1    1150 3850
	1    0    0    1   
$EndComp
Wire Wire Line
	1750 3850 1700 3850
Text Label 6250 1650 1    50   ~ 0
~WAIT
Text Label 6050 1650 1    50   ~ 0
~RD
Text Label 5950 1650 1    50   ~ 0
~HALT
Text Label 5850 1650 1    50   ~ 0
~IORQ
Text Label 5750 1650 1    50   ~ 0
~NMI
Text Label 5650 1650 1    50   ~ 0
~MREQ
Text Label 5550 1650 1    50   ~ 0
~WR
Text Label 5450 1650 1    50   ~ 0
~M1
$Comp
L zx81:Z80A IC3
U 1 1 5D29CAB9
P 5750 2950
F 0 "IC3" H 5700 3000 50  0000 L CNB
F 1 "Z80A" H 5700 2900 50  0000 L CNN
F 2 "Package_DIP:DIP-40_W15.24mm" H 5750 3050 50  0001 C CNN
F 3 "" H 5750 3050 50  0001 C CNN
	1    5750 2950
	1    0    0    -1  
$EndComp
Text Label 5850 4475 3    50   ~ 0
~BUSACK
Text Label 6150 4450 3    50   ~ 0
~RFSH
Text Label 6450 4050 0    50   ~ 0
~BUSRQ
Text Label 5050 2250 2    39   ~ 0
~RESET
Wire Wire Line
	5100 2200 5100 2250
Connection ~ 5100 2250
Wire Wire Line
	5050 2250 5100 2250
Wire Wire Line
	4250 3000 4250 3800
Wire Wire Line
	4350 3800 4350 3100
Wire Wire Line
	4650 2950 4650 3400
$Comp
L zx81:ULA IC1
U 1 1 5D29F209
P 3350 2950
F 0 "IC1" H 3200 3300 50  0000 L CNB
F 1 "ULA" H 3200 3225 50  0000 L CNN
F 2 "Package_DIP:DIP-40_W15.24mm" H 3200 3150 50  0001 C CNN
F 3 "" H 3200 3150 50  0001 C CNN
	1    3350 2950
	1    0    0    -1  
$EndComp
$Comp
L zx81:2364 IC2
U 1 1 5D2A1D40
P 6150 6225
F 0 "IC2" H 6150 6325 50  0000 C CNB
F 1 "2364" H 6150 6225 50  0000 C CNN
F 2 "Package_DIP:DIP-24_W15.24mm" H 6050 6275 50  0001 C CNN
F 3 "" H 6050 6275 50  0001 C CNN
	1    6150 6225
	1    0    0    -1  
$EndComp
Text Label 6650 3850 0    50   ~ 0
~INT
Text Label 5750 6625 2    50   ~ 0
~ROMCS'
Text Notes 1450 5675 0    50   ~ 0
C3 near Edge Connector
Text Label 2650 2850 2    50   ~ 0
KBD0
Text Label 2650 2950 2    50   ~ 0
KBD1
Text Label 2650 3050 2    50   ~ 0
KBD2
Text Label 2650 3150 2    50   ~ 0
KBD3
Text Label 2650 3250 2    50   ~ 0
KBD4
$Comp
L power:GND #PWR0118
U 1 1 5D5AA0B9
P 5550 4450
F 0 "#PWR0118" H 5550 4200 50  0001 C CNN
F 1 "GND" H 5555 4277 50  0001 C CNN
F 2 "" H 5550 4450 50  0001 C CNN
F 3 "" H 5550 4450 50  0001 C CNN
	1    5550 4450
	1    0    0    -1  
$EndComp
$Comp
L power:+5V #PWR0119
U 1 1 5D5C2886
P 5250 4550
F 0 "#PWR0119" H 5250 4400 50  0001 C CNN
F 1 "+5V" H 5250 4700 50  0000 C CNN
F 2 "" H 5250 4550 50  0001 C CNN
F 3 "" H 5250 4550 50  0001 C CNN
	1    5250 4550
	1    0    0    -1  
$EndComp
Wire Wire Line
	5450 4450 5450 4550
Wire Wire Line
	5450 4550 5250 4550
$Comp
L power:GND #PWR0120
U 1 1 5D5F437B
P 2600 2250
F 0 "#PWR0120" H 2600 2000 50  0001 C CNN
F 1 "GND" H 2605 2077 50  0001 C CNN
F 2 "" H 2600 2250 50  0001 C CNN
F 3 "" H 2600 2250 50  0001 C CNN
	1    2600 2250
	1    0    0    -1  
$EndComp
$Comp
L power:+5V #PWR0121
U 1 1 5D63D2D8
P 2600 2150
F 0 "#PWR0121" H 2600 2000 50  0001 C CNN
F 1 "+5V" H 2600 2300 50  0000 C CNN
F 2 "" H 2600 2150 50  0001 C CNN
F 3 "" H 2600 2150 50  0001 C CNN
	1    2600 2150
	1    0    0    -1  
$EndComp
Wire Wire Line
	9850 3600 9800 3600
Wire Wire Line
	9800 3600 9800 3500
Connection ~ 9800 3500
Wire Wire Line
	9800 3500 9850 3500
$Comp
L Device:R_Small R32
U 1 1 5D2E5945
P 1900 1950
F 0 "R32" V 1825 1950 39  0000 C CNN
F 1 "560" V 2100 2050 50  0001 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" H 1900 1950 50  0001 C CNN
F 3 "~" H 1900 1950 50  0001 C CNN
F 4 "USA ONLY" V 2300 1900 50  0001 L CNN "Comment"
	1    1900 1950
	0    1    1    0   
$EndComp
$Comp
L Device:R_Small R31
U 1 1 5D2E709E
P 1750 2100
F 0 "R31" H 1850 2100 39  0000 C CNN
F 1 "260" H 1809 2100 50  0001 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" H 1750 2100 50  0001 C CNN
F 3 "~" H 1750 2100 50  0001 C CNN
F 4 "USA ONLY" H 1809 2009 50  0001 L CNN "Comment"
	1    1750 2100
	1    0    0    -1  
$EndComp
Text Notes 2450 975  2    50   ~ 0
FR/UK: UM1233\nUSA: UM1082 LA 2/3
$Comp
L zx81:MODULATOR MOD1
U 1 1 5D371F08
P 1750 1275
F 0 "MOD1" H 700 1975 50  0001 C CNN
F 1 "MODULATOR" H 2200 1300 50  0000 R CNN
F 2 "Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical" H 700 2225 50  0001 C CNN
F 3 "" H 700 2225 50  0001 C CNN
	1    1750 1275
	1    0    0    -1  
$EndComp
$Comp
L Switch:SW_SPDT SW1
U 1 1 5D373EEB
P 950 1325
F 0 "SW1" H 900 1150 50  0000 C CNN
F 1 "~" H 950 1519 50  0001 C CNN
F 2 "Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical" H 950 1325 50  0001 C CNN
F 3 "~" H 950 1325 50  0001 C CNN
	1    950  1325
	-1   0    0    1   
$EndComp
$Comp
L Device:D_Small_ALT D9
U 1 1 5D3FE3CE
P 2100 1950
F 0 "D9" H 2100 2025 39  0000 C CNN
F 1 "?" H 2100 2064 50  0001 C CNN
F 2 "Diode_THT:D_DO-35_SOD27_P10.16mm_Horizontal" V 2100 1950 50  0001 C CNN
F 3 "~" V 2100 1950 50  0001 C CNN
	1    2100 1950
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0122
U 1 1 5D4024E1
P 1750 2200
F 0 "#PWR0122" H 1750 1950 50  0001 C CNN
F 1 "GND" H 1755 2027 50  0001 C CNN
F 2 "" H 1750 2200 50  0001 C CNN
F 3 "" H 1750 2200 50  0001 C CNN
	1    1750 2200
	1    0    0    -1  
$EndComp
Wire Wire Line
	1750 2000 1750 1950
Wire Wire Line
	1750 1950 1800 1950
$Comp
L Device:R_Small R322
U 1 1 5D43DDCD
P 1700 2550
F 0 "R322" V 1700 2550 20  0000 C CNN
F 1 "2.2k" V 1900 2650 50  0001 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" H 1700 2550 50  0001 C CNN
F 3 "~" H 1700 2550 50  0001 C CNN
F 4 "Fr ONLY" V 2100 2500 50  0001 L CNN "Comment"
F 5 "R32'" V 1625 2550 39  0000 C CNN "OriginalReference"
	1    1700 2550
	0    1    1    0   
$EndComp
$Comp
L Device:R_Small R312
U 1 1 5D43DDD4
P 1550 2700
F 0 "R312" V 1550 2650 20  0000 L CNN
F 1 "~" H 1609 2700 50  0001 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" H 1550 2700 50  0001 C CNN
F 3 "~" H 1550 2700 50  0001 C CNN
F 4 "FR ONLY" H 1609 2609 50  0001 L CNN "Comment"
F 5 "R31'" H 1650 2700 39  0000 C CNN "OriginalReference"
	1    1550 2700
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0123
U 1 1 5D43DDE0
P 1550 2800
F 0 "#PWR0123" H 1550 2550 50  0001 C CNN
F 1 "GND" H 1555 2627 50  0001 C CNN
F 2 "" H 1550 2800 50  0001 C CNN
F 3 "" H 1550 2800 50  0001 C CNN
	1    1550 2800
	1    0    0    -1  
$EndComp
Wire Wire Line
	1550 2600 1550 2550
Wire Wire Line
	1550 2550 1600 2550
Text Notes 725  1800 1    50   ~ 0
CHANNEL SELECT SWITCH\nU.S.A. ONLY
$Comp
L power:GND #PWR0124
U 1 1 5D6080F9
P 1350 1800
F 0 "#PWR0124" H 1350 1550 50  0001 C CNN
F 1 "GND" H 1355 1627 50  0001 C CNN
F 2 "" H 1350 1800 50  0001 C CNN
F 3 "" H 1350 1800 50  0001 C CNN
	1    1350 1800
	1    0    0    -1  
$EndComp
$Comp
L power:+5V #PWR0125
U 1 1 5D661076
P 1350 850
F 0 "#PWR0125" H 1350 700 50  0001 C CNN
F 1 "+5V" H 1350 1000 50  0000 C CNN
F 2 "" H 1350 850 50  0001 C CNN
F 3 "" H 1350 850 50  0001 C CNN
	1    1350 850 
	1    0    0    -1  
$EndComp
$Comp
L Connector:AudioJack2 J3
U 1 1 5D69C5A8
P 1150 3150
F 0 "J3" H 971 3133 50  0001 R CNN
F 1 "MIC" H 970 3179 50  0000 R CNN
F 2 "Connector_Audio:Jack_3.5mm_CUI_SJ1-3533NG_Horizontal" H 1150 3150 50  0001 C CNN
F 3 "~" H 1150 3150 50  0001 C CNN
	1    1150 3150
	1    0    0    1   
$EndComp
$Comp
L power:GND #PWR0126
U 1 1 5D74E6A7
P 1350 3575
F 0 "#PWR0126" H 1350 3325 50  0001 C CNN
F 1 "GND" H 1355 3402 50  0001 C CNN
F 2 "" H 1350 3575 50  0001 C CNN
F 3 "" H 1350 3575 50  0001 C CNN
	1    1350 3575
	1    0    0    -1  
$EndComp
$Comp
L Device:C_Small C11
U 1 1 5D78ABF3
P 1700 3350
F 0 "C11" H 1575 3400 39  0000 C CNN
F 1 "47n" H 1575 3350 39  0000 C CNN
F 2 "Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm" H 1700 3350 50  0001 C CNN
F 3 "~" H 1700 3350 50  0001 C CNN
F 4 "Ceramic disc" H -300 -500 50  0001 C CNN "Comment"
	1    1700 3350
	1    0    0    -1  
$EndComp
$Comp
L Device:R_Small R27
U 1 1 5D7A8E70
P 1950 3350
F 0 "R27" H 1900 3400 39  0000 R CNN
F 1 "1k" H 1900 3350 39  0000 R CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" H 1950 3350 50  0001 C CNN
F 3 "~" H 1950 3350 50  0001 C CNN
	1    1950 3350
	1    0    0    -1  
$EndComp
Wire Notes Line
	1650 1800 2300 1800
Wire Notes Line
	1650 2350 1650 1800
Wire Notes Line
	2300 2350 1650 2350
Wire Notes Line
	2300 1800 2300 2350
Wire Notes Line
	1450 2400 2100 2400
Wire Notes Line
	2100 2400 2100 2950
Wire Notes Line
	2100 2950 1450 2950
Wire Notes Line
	1450 2950 1450 2400
Text Notes 1900 2325 0    50   ~ 0
USA ONLY
Text Notes 1775 2925 0    50   ~ 0
Fr ONLY
$Comp
L Device:C_Small C12
U 1 1 5D95575A
P 2150 3150
F 0 "C12" V 2250 3150 39  0000 C CNN
F 1 "47p" V 2300 3150 39  0000 C CNN
F 2 "Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm" H 2150 3150 50  0001 C CNN
F 3 "~" H 2150 3150 50  0001 C CNN
F 4 "Ceramic disc" H 150 -700 50  0001 C CNN "Comment"
	1    2150 3150
	0    1    1    0   
$EndComp
$Comp
L Device:R_Small R29
U 1 1 5D9BA99F
P 2350 2850
F 0 "R29" H 2300 2900 50  0000 R CNN
F 1 "1M" H 2300 2825 50  0000 R CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" H 2350 2850 50  0001 C CNN
F 3 "~" H 2350 2850 50  0001 C CNN
	1    2350 2850
	1    0    0    -1  
$EndComp
Wire Wire Line
	1700 3550 1950 3550
Connection ~ 1700 3550
$Comp
L power:+5V #PWR0127
U 1 1 5DBC714B
P 10250 2050
F 0 "#PWR0127" H 10250 1900 50  0001 C CNN
F 1 "+5V" H 10350 2125 50  0000 C CNN
F 2 "" H 10250 2050 50  0001 C CNN
F 3 "" H 10250 2050 50  0001 C CNN
	1    10250 2050
	1    0    0    -1  
$EndComp
Wire Wire Line
	10150 2150 10150 2100
Wire Wire Line
	10250 2100 10250 2150
Connection ~ 10250 2100
Wire Wire Line
	10150 2100 10250 2100
$Comp
L power:GND #PWR0128
U 1 1 5DC551BB
P 10250 4250
F 0 "#PWR0128" H 10250 4000 50  0001 C CNN
F 1 "GND" H 10255 4077 50  0001 C CNN
F 2 "" H 10250 4250 50  0001 C CNN
F 3 "" H 10250 4250 50  0001 C CNN
	1    10250 4250
	1    0    0    -1  
$EndComp
Wire Wire Line
	9500 1900 9500 3500
Wire Wire Line
	9500 3500 9800 3500
Wire Wire Line
	9750 2750 9850 2750
$Comp
L zx81:4816_4118 IC4
U 1 1 5D26BD80
P 10250 3150
F 0 "IC4" H 10250 3600 50  0000 L CNB
F 1 "4816_4118" H 10100 3500 50  0000 L CNN
F 2 "Package_DIP:DIP-28_W15.24mm" H 8450 4350 50  0001 C CNN
F 3 "" H 8450 4350 50  0001 C CNN
	1    10250 3150
	1    0    0    -1  
$EndComp
Text Label 10900 3125 0    50   ~ 0
A10
Entry Wire Line
	10900 3125 11000 3225
Text Notes 10950 2950 0    39   ~ 0
1K
Text Notes 10950 3025 0    39   ~ 0
2K
Wire Wire Line
	9850 3750 9800 3750
Wire Wire Line
	9800 3750 9800 3850
Wire Wire Line
	9800 3850 9850 3850
Wire Wire Line
	9425 1975 9425 3750
Wire Wire Line
	9425 3750 9800 3750
Connection ~ 9800 3750
$Comp
L power:+5V #PWR0129
U 1 1 5D82F708
P 10425 5650
F 0 "#PWR0129" H 10425 5500 50  0001 C CNN
F 1 "+5V" H 10425 5825 50  0000 C CNN
F 2 "" H 10425 5650 50  0001 C CNN
F 3 "" H 10425 5650 50  0001 C CNN
	1    10425 5650
	1    0    0    -1  
$EndComp
Wire Wire Line
	9775 6075 10025 6075
Wire Wire Line
	9775 5975 10025 5975
Wire Wire Line
	9775 5875 10025 5875
Wire Wire Line
	9775 5775 10025 5775
Wire Wire Line
	9775 5675 10025 5675
Text Label 9775 5675 0    50   ~ 0
KBD4
Text Label 9775 5775 0    50   ~ 0
KBD3
Text Label 9775 5875 0    50   ~ 0
KBD2
Text Label 9775 5975 0    50   ~ 0
KBD1
Text Label 9775 6075 0    50   ~ 0
KBD0
$Comp
L Device:R_Network05 RP3
U 1 1 5D55BFF8
P 10225 5875
F 0 "RP3" V 10300 6175 50  0000 R CNN
F 1 "10k" V 10375 6025 50  0000 L CNN
F 2 "Resistor_THT:R_Array_SIP6" V 10600 5875 50  0001 C CNN
F 3 "" H 10225 5875 50  0001 C CNN
	1    10225 5875
	0    1    1    0   
$EndComp
$Comp
L Connector_Generic:Conn_01x05 KB1
U 1 1 5D3EF26B
P 9575 5875
F 0 "KB1" H 9500 5575 50  0000 L CNN
F 1 "~" H 9655 5826 50  0001 L CNN
F 2 "Connector_PinSocket_2.54mm:PinSocket_1x05_P2.54mm_Vertical" H 9575 5875 50  0001 C CNN
F 3 "~" H 9575 5875 50  0001 C CNN
	1    9575 5875
	-1   0    0    1   
$EndComp
$Comp
L Device:D_Small_ALT D6
U 1 1 5DB3D1BA
P 9050 5675
F 0 "D6" H 9100 5700 25  0000 L CNN
F 1 "1N4148" H 9050 5789 50  0001 C CNN
F 2 "Diode_THT:D_DO-35_SOD27_P10.16mm_Horizontal" V 9050 5675 50  0001 C CNN
F 3 "~" V 9050 5675 50  0001 C CNN
	1    9050 5675
	1    0    0    1   
$EndComp
$Comp
L Device:D_Small_ALT D4
U 1 1 5DB53EB8
P 9050 5775
F 0 "D4" H 9100 5800 25  0000 L CNN
F 1 "1N4148" H 9050 5889 50  0001 C CNN
F 2 "Diode_THT:D_DO-35_SOD27_P10.16mm_Horizontal" V 9050 5775 50  0001 C CNN
F 3 "~" V 9050 5775 50  0001 C CNN
	1    9050 5775
	1    0    0    1   
$EndComp
$Comp
L Device:D_Small_ALT D2
U 1 1 5DB68C31
P 9050 5875
F 0 "D2" H 9100 5900 25  0000 L CNN
F 1 "1N4148" H 9050 5989 50  0001 C CNN
F 2 "Diode_THT:D_DO-35_SOD27_P10.16mm_Horizontal" V 9050 5875 50  0001 C CNN
F 3 "~" V 9050 5875 50  0001 C CNN
	1    9050 5875
	1    0    0    1   
$EndComp
$Comp
L Device:D_Small_ALT D1
U 1 1 5DB7D946
P 9050 5975
F 0 "D1" H 9100 6000 25  0000 L CNN
F 1 "1N4148" H 9050 6089 50  0001 C CNN
F 2 "Diode_THT:D_DO-35_SOD27_P10.16mm_Horizontal" V 9050 5975 50  0001 C CNN
F 3 "~" V 9050 5975 50  0001 C CNN
	1    9050 5975
	1    0    0    1   
$EndComp
$Comp
L Device:D_Small_ALT D3
U 1 1 5DB925DE
P 9050 6075
F 0 "D3" H 9100 6100 25  0000 L CNN
F 1 "1N4148" H 9050 6189 50  0001 C CNN
F 2 "Diode_THT:D_DO-35_SOD27_P10.16mm_Horizontal" V 9050 6075 50  0001 C CNN
F 3 "~" V 9050 6075 50  0001 C CNN
	1    9050 6075
	1    0    0    1   
$EndComp
$Comp
L Device:D_Small_ALT D5
U 1 1 5DBA714A
P 9050 6175
F 0 "D5" H 9100 6200 25  0000 L CNN
F 1 "1N4148" H 9050 6289 50  0001 C CNN
F 2 "Diode_THT:D_DO-35_SOD27_P10.16mm_Horizontal" V 9050 6175 50  0001 C CNN
F 3 "~" V 9050 6175 50  0001 C CNN
	1    9050 6175
	1    0    0    1   
$EndComp
$Comp
L Device:D_Small_ALT D7
U 1 1 5DBBBF0E
P 9050 6275
F 0 "D7" H 9100 6300 25  0000 L CNN
F 1 "1N4148" H 9050 6389 50  0001 C CNN
F 2 "Diode_THT:D_DO-35_SOD27_P10.16mm_Horizontal" V 9050 6275 50  0001 C CNN
F 3 "~" V 9050 6275 50  0001 C CNN
	1    9050 6275
	1    0    0    1   
$EndComp
$Comp
L Device:D_Small_ALT D8
U 1 1 5DBD0B42
P 9050 6375
F 0 "D8" H 9100 6400 25  0000 L CNN
F 1 "1N4148" H 9050 6489 50  0001 C CNN
F 2 "Diode_THT:D_DO-35_SOD27_P10.16mm_Horizontal" V 9050 6375 50  0001 C CNN
F 3 "~" V 9050 6375 50  0001 C CNN
	1    9050 6375
	1    0    0    1   
$EndComp
Text Label 8950 5775 2    50   ~ 0
A9
Text Label 8950 5875 2    50   ~ 0
A10
Text Label 8950 5975 2    50   ~ 0
A11
Text Label 8950 6075 2    50   ~ 0
A12
Text Label 8950 6175 2    50   ~ 0
A13
Text Label 8950 6275 2    50   ~ 0
A14
Text Label 8950 6375 2    50   ~ 0
A15
Entry Wire Line
	8700 6475 8800 6375
Entry Wire Line
	8700 6375 8800 6275
Entry Wire Line
	8700 6275 8800 6175
Entry Wire Line
	8700 6175 8800 6075
Entry Wire Line
	8700 6075 8800 5975
Entry Wire Line
	8700 5975 8800 5875
Entry Wire Line
	8700 5875 8800 5775
Wire Wire Line
	8800 5775 8950 5775
Wire Wire Line
	8800 5875 8950 5875
Wire Wire Line
	8800 5975 8950 5975
Wire Wire Line
	8800 6075 8950 6075
Wire Wire Line
	8800 6175 8950 6175
Wire Wire Line
	8800 6275 8950 6275
Wire Wire Line
	8800 6375 8950 6375
Text Label 8950 5675 2    50   ~ 0
A8
Entry Wire Line
	8800 5675 8700 5775
Wire Wire Line
	8800 5675 8950 5675
$Comp
L Connector_Generic:Conn_01x08 KB2
U 1 1 5D3F01E8
P 9350 5975
F 0 "KB2" H 9425 6375 50  0000 R CNN
F 1 "~" H 9430 5876 50  0001 L CNN
F 2 "Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical" H 9350 5975 50  0001 C CNN
F 3 "~" H 9350 5975 50  0001 C CNN
	1    9350 5975
	1    0    0    -1  
$EndComp
Entry Wire Line
	8600 6425 8700 6325
Entry Wire Line
	8600 6325 8700 6225
Entry Wire Line
	8600 6225 8700 6125
Entry Wire Line
	8600 6125 8700 6025
Entry Wire Line
	8600 6025 8700 5925
Entry Wire Line
	8600 5925 8700 5825
Entry Wire Line
	8600 5825 8700 5725
Entry Wire Line
	8600 5725 8700 5625
Entry Wire Line
	8600 5625 8700 5525
Wire Wire Line
	7650 5625 8600 5625
Connection ~ 7650 5625
Wire Wire Line
	8600 5825 7850 5825
Connection ~ 7850 5825
Wire Wire Line
	7950 5925 8600 5925
Connection ~ 7950 5925
Wire Wire Line
	8600 6025 8050 6025
Connection ~ 8050 6025
Wire Wire Line
	8150 6125 8600 6125
Connection ~ 8150 6125
Wire Wire Line
	8600 6225 8250 6225
Connection ~ 8250 6225
Wire Wire Line
	8350 6325 8600 6325
Connection ~ 8350 6325
Wire Wire Line
	8600 6425 8450 6425
Connection ~ 8450 6425
Connection ~ 2350 2550
Wire Wire Line
	2000 2550 2350 2550
Wire Wire Line
	2200 1950 2350 1950
Wire Wire Line
	2350 1950 2350 2550
Wire Wire Line
	2350 2550 2650 2550
Wire Wire Line
	2350 1725 2350 1950
Connection ~ 2350 1950
Wire Wire Line
	1750 1725 1750 1950
Connection ~ 1750 1950
Wire Wire Line
	1550 2550 1550 1725
Connection ~ 1550 2550
Wire Wire Line
	1550 925  1550 875 
Wire Wire Line
	1550 875  1450 875 
Wire Wire Line
	1350 875  1350 925 
Connection ~ 1450 875 
Wire Wire Line
	1450 875  1350 875 
Wire Wire Line
	1450 925  1450 875 
Wire Wire Line
	1350 875  750  875 
Wire Wire Line
	750  875  750  1225
Connection ~ 1350 875 
Wire Wire Line
	1350 1775 1350 1725
Wire Wire Line
	1350 1775 750  1775
Wire Wire Line
	750  1775 750  1425
Connection ~ 1350 1775
Wire Wire Line
	2600 2150 2650 2150
Wire Wire Line
	2600 2250 2650 2250
Wire Wire Line
	1950 3850 2050 3850
Wire Wire Line
	2250 3850 2650 3850
Wire Wire Line
	1350 3950 1350 4250
Wire Wire Line
	1350 3850 1700 3850
Connection ~ 1700 3850
Wire Wire Line
	1350 4250 1700 4250
Wire Wire Line
	1700 3850 1700 3950
Wire Wire Line
	1700 4150 1700 4250
Connection ~ 1700 4250
Connection ~ 1350 4250
Wire Wire Line
	1700 4250 2550 4250
Wire Wire Line
	1350 3250 1350 3550
Connection ~ 1350 3550
Wire Wire Line
	1350 3550 1700 3550
Wire Wire Line
	1350 3150 1700 3150
Wire Wire Line
	1700 3250 1700 3150
Wire Wire Line
	1700 3450 1700 3550
Connection ~ 1700 3150
Wire Wire Line
	2250 3150 2350 3150
Wire Wire Line
	1700 3150 1950 3150
Wire Wire Line
	1950 3250 1950 3150
Connection ~ 1950 3150
Wire Wire Line
	1950 3150 2050 3150
Wire Wire Line
	1950 3450 1950 3550
Wire Wire Line
	1350 5250 1350 5550
Wire Wire Line
	1350 5550 1700 5550
Connection ~ 1350 5550
Wire Wire Line
	1700 5150 1700 5250
Wire Wire Line
	1700 5450 1700 5550
Connection ~ 1700 5550
Wire Wire Line
	1700 5550 2150 5550
Wire Wire Line
	2150 5450 2150 5550
Connection ~ 2150 5550
Wire Wire Line
	2150 5550 2650 5550
Wire Wire Line
	2650 5150 2650 5250
Wire Wire Line
	2650 5450 2650 5550
Connection ~ 2650 5550
Wire Wire Line
	2650 5550 2900 5550
Wire Wire Line
	2900 5150 2900 5250
Wire Wire Line
	2900 5450 2900 5550
Connection ~ 2900 5550
Wire Wire Line
	2900 5550 3150 5550
Wire Wire Line
	3150 5150 3150 5250
Wire Wire Line
	3150 5450 3150 5550
Connection ~ 3150 5550
Wire Wire Line
	3150 5550 3400 5550
Wire Wire Line
	3400 5150 3400 5250
Wire Wire Line
	3400 5450 3400 5550
Wire Wire Line
	2450 5150 2650 5150
Wire Wire Line
	2650 5100 2650 5150
Wire Wire Line
	1350 5575 1350 5550
Wire Wire Line
	1350 4275 1350 4250
Wire Wire Line
	1350 3575 1350 3550
Wire Wire Line
	1350 1800 1350 1775
Wire Wire Line
	5400 6625 5750 6625
Wire Wire Line
	7300 2350 7225 2350
Wire Wire Line
	7225 2350 7225 1975
Wire Wire Line
	7225 1975 8475 1975
Connection ~ 7225 1975
Wire Wire Line
	7900 2350 7975 2350
Connection ~ 7975 1900
Wire Wire Line
	7975 1900 7975 2350
Wire Wire Line
	8475 2350 8475 1975
Connection ~ 8475 1975
Wire Wire Line
	8475 2350 8550 2350
Wire Wire Line
	8475 1975 9425 1975
Wire Wire Line
	9225 2350 9225 1900
Connection ~ 9225 1900
Wire Wire Line
	9225 1900 9500 1900
Wire Wire Line
	9150 2350 9225 2350
Wire Wire Line
	7975 1900 9225 1900
Wire Wire Line
	6550 6525 6750 6525
Wire Wire Line
	6550 6625 6750 6625
Wire Wire Line
	6550 6725 6750 6725
Wire Wire Line
	6550 6825 6750 6825
Wire Wire Line
	10425 5650 10425 5675
Entry Bus Bus
	5050 4350 5150 4450
Wire Wire Line
	5600 5625 5750 5625
Wire Wire Line
	5750 5725 5600 5725
Wire Wire Line
	5600 5825 5750 5825
Wire Wire Line
	5750 5925 5600 5925
Wire Wire Line
	5600 6025 5750 6025
Wire Wire Line
	5750 6125 5600 6125
Wire Wire Line
	5600 6225 5750 6225
Wire Wire Line
	5750 6325 5600 6325
Wire Wire Line
	7650 5575 7650 5625
Wire Wire Line
	7850 5575 7850 5825
Wire Wire Line
	7950 5575 7950 5925
Wire Wire Line
	8050 5575 8050 6025
Wire Wire Line
	8150 5575 8150 6125
Wire Wire Line
	8250 5575 8250 6225
Wire Wire Line
	8350 5575 8350 6325
Wire Wire Line
	8450 5575 8450 6425
Wire Wire Line
	7450 5725 7750 5725
Entry Bus Bus
	3050 4800 3150 4900
Entry Bus Bus
	5150 4700 5250 4800
Wire Bus Line
	5150 4700 5150 4450
Connection ~ 8100 4800
Wire Bus Line
	8100 4800 9350 4800
Wire Wire Line
	2850 4450 2850 4700
Wire Wire Line
	2950 4450 2950 4700
Entry Bus Bus
	3950 4750 4050 4850
Wire Wire Line
	3050 4450 3050 4650
Wire Wire Line
	3150 4450 3150 4650
Wire Wire Line
	3250 4450 3250 4650
Wire Wire Line
	3350 4450 3350 4650
Wire Wire Line
	3450 4450 3450 4650
Wire Wire Line
	3550 4450 3550 4650
Wire Wire Line
	3650 4450 3650 4650
Wire Wire Line
	3750 4450 3750 4650
Wire Wire Line
	3850 4450 3850 4650
Wire Wire Line
	7750 5575 7750 5725
Connection ~ 7750 5725
Wire Wire Line
	7750 5725 8600 5725
Connection ~ 6850 4900
Entry Bus Bus
	10850 4800 10950 4700
Connection ~ 9350 4800
Entry Bus Bus
	10900 4900 11000 4800
Connection ~ 8700 4900
Wire Wire Line
	5100 6625 4100 6625
Wire Wire Line
	4100 6625 4100 3950
Wire Wire Line
	4100 3950 4050 3950
Connection ~ 8350 4900
Wire Bus Line
	8350 4900 8700 4900
Wire Bus Line
	8700 4900 9650 4900
Connection ~ 9650 4900
Wire Bus Line
	6850 4900 7100 4900
Connection ~ 7100 4900
Wire Bus Line
	7100 4900 8350 4900
Wire Bus Line
	3150 4900 6850 4900
Wire Wire Line
	6975 4050 6975 3950
Wire Wire Line
	6450 4050 6975 4050
Wire Wire Line
	6450 2050 6750 2050
Wire Wire Line
	6450 2150 6750 2150
Wire Wire Line
	6450 2250 6750 2250
Wire Wire Line
	6450 2350 6750 2350
Wire Wire Line
	6450 2450 6750 2450
Wire Wire Line
	6450 2550 6750 2550
Wire Wire Line
	6450 2650 6750 2650
Wire Wire Line
	6450 2750 6750 2750
Wire Wire Line
	6450 2850 6750 2850
Wire Wire Line
	6450 2950 6750 2950
Wire Wire Line
	6450 3050 6750 3050
Wire Wire Line
	6450 3150 6750 3150
Wire Wire Line
	6450 3250 6750 3250
Wire Wire Line
	6450 3350 6750 3350
Wire Wire Line
	6450 3450 6750 3450
Wire Wire Line
	6450 3550 6750 3550
Wire Wire Line
	6450 3850 6750 3850
Entry Wire Line
	6950 5725 7050 5625
Entry Wire Line
	6950 5625 7050 5525
Entry Wire Line
	6950 5825 7050 5725
Entry Wire Line
	6950 5925 7050 5825
Entry Wire Line
	6950 6025 7050 5925
Entry Wire Line
	6950 6125 7050 6025
Entry Wire Line
	6950 6225 7050 6125
Entry Wire Line
	6950 6325 7050 6225
Entry Wire Line
	6950 6425 7050 6325
Entry Bus Bus
	6950 4850 7050 4950
Wire Bus Line
	6950 4850 4050 4850
Wire Bus Line
	5250 4800 5500 4800
Connection ~ 5500 4800
Wire Bus Line
	5500 4800 8100 4800
$Comp
L Device:D_Zener_Small_ALT D92
U 1 1 5DCA6005
P 1900 2550
F 0 "D92" H 1900 2625 20  0000 C CNN
F 1 "?" H 1900 2436 50  0001 C CNN
F 2 "Diode_THT:D_DO-35_SOD27_P10.16mm_Horizontal" V 1900 2550 50  0001 C CNN
F 3 "~" V 1900 2550 50  0001 C CNN
F 4 "D9'" H 1900 2475 39  0000 C CNN "OriginalReference"
	1    1900 2550
	-1   0    0    1   
$EndComp
$Comp
L Device:CP_Small C3
U 1 1 5D280DD8
P 1700 5350
F 0 "C3" H 1725 5425 50  0000 L CNN
F 1 "22u" H 1475 5400 50  0000 L CNN
F 2 "Capacitor_THT:CP_Axial_L18.0mm_D6.5mm_P25.00mm_Horizontal" H 1700 5350 50  0001 C CNN
F 3 "~" H 1700 5350 50  0001 C CNN
F 4 "16V" H 1475 5325 50  0000 L CNN "Voltage"
F 5 "Electrolytic 16V" H 1700 5350 50  0001 C CNN "Comment"
	1    1700 5350
	1    0    0    -1  
$EndComp
Wire Wire Line
	2350 2950 2350 3150
Wire Wire Line
	2350 2550 2350 2750
$Comp
L power:PWR_FLAG #FLG0102
U 1 1 5DEBCC93
P 3400 5550
F 0 "#FLG0102" H 3400 5625 50  0001 C CNN
F 1 "PWR_FLAG" H 3400 5723 50  0000 C CNN
F 2 "" H 3400 5550 50  0001 C CNN
F 3 "~" H 3400 5550 50  0001 C CNN
	1    3400 5550
	-1   0    0    1   
$EndComp
Connection ~ 3400 5550
$Comp
L power:PWR_FLAG #FLG0103
U 1 1 5DEE7309
P 1700 5150
F 0 "#FLG0103" H 1700 5225 50  0001 C CNN
F 1 "PWR_FLAG" H 1700 5323 50  0000 C CNN
F 2 "" H 1700 5150 50  0001 C CNN
F 3 "~" H 1700 5150 50  0001 C CNN
	1    1700 5150
	1    0    0    -1  
$EndComp
$Comp
L zx81:Jumper J4
U 1 1 5DFCA258
P 10900 2950
F 0 "J4" V 10900 3038 50  0001 L CNN
F 1 "Jumper" V 10945 3038 50  0001 L CNN
F 2 "Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical" H 10900 2950 50  0001 C CNN
F 3 "" H 10900 2950 50  0001 C CNN
	1    10900 2950
	0    1    1    0   
$EndComp
Wire Wire Line
	10900 3125 10900 3050
Wire Bus Line
	11000 4800 11000 3225
Wire Wire Line
	1350 850  1350 875 
Wire Wire Line
	7975 1900 7275 1900
Wire Wire Line
	5450 1400 5450 1650
Wire Wire Line
	5750 1250 5750 1650
Wire Wire Line
	5550 1350 7225 1350
Connection ~ 5550 1350
Wire Wire Line
	7225 1350 7225 1975
Wire Wire Line
	5550 1350 5550 1650
Wire Wire Line
	6750 1250 5750 1250
Connection ~ 5750 1250
Wire Wire Line
	5950 1050 3250 1050
Wire Wire Line
	3250 1050 3250 1650
Wire Wire Line
	5950 1050 5950 1650
Wire Wire Line
	6150 1050 5950 1050
Connection ~ 6150 1050
Connection ~ 5950 1050
Wire Wire Line
	6050 975  3150 975 
Wire Wire Line
	6050 975  6050 1650
Wire Wire Line
	3150 975  3150 1650
Wire Wire Line
	6250 1300 6850 1300
Wire Wire Line
	6850 1300 6850 1250
Connection ~ 6850 1250
Wire Wire Line
	6250 1300 6250 1650
Wire Wire Line
	7275 800  2950 800 
Wire Wire Line
	7275 800  7275 1900
Wire Wire Line
	2950 800  2950 1350
Wire Wire Line
	5850 1150 3350 1150
Wire Wire Line
	3350 1150 3350 1650
Wire Wire Line
	5850 1150 5850 1650
Wire Wire Line
	5850 4475 5850 4450
Wire Wire Line
	10250 2050 10250 2100
Wire Wire Line
	6150 4450 6150 4750
Wire Wire Line
	6150 4750 9700 4750
$Comp
L Device:CP_Small C5
U 1 1 5D71E777
P 5100 2375
F 0 "C5" H 4925 2425 50  0000 L CNN
F 1 "1u" H 4925 2350 50  0000 L CNN
F 2 "Capacitor_THT:CP_Axial_L18.0mm_D6.5mm_P25.00mm_Horizontal" H 5100 2375 50  0001 C CNN
F 3 "~" H 5100 2375 50  0001 C CNN
F 4 "Electrolytic 5V" H 5100 2375 50  0001 C CNN "Comment"
F 5 "5V" H 5100 2375 50  0001 C CNN "Voltage"
	1    5100 2375
	1    0    0    -1  
$EndComp
Wire Wire Line
	5100 2275 5100 2250
Wire Wire Line
	5100 2450 5100 2475
Text Notes 7300 4050 0    50   ~ 0
N.B. IC4A & IC4B\nare an alternative\nto IC4
Text Notes 9725 4700 0    50   ~ 0
IC4 socket will accept\n4118 1Kx8 RAM at the bottom\nor\n4816 2Kx8 RAM
Wire Wire Line
	9850 4050 9700 4050
Wire Wire Line
	9700 4050 9700 4750
Wire Wire Line
	10900 2100 10900 2400
Connection ~ 10900 2400
Wire Wire Line
	10900 2400 10900 2850
Wire Wire Line
	10250 2100 10900 2100
Wire Wire Line
	10650 2400 10900 2400
Wire Wire Line
	10650 2950 10800 2950
Wire Bus Line
	9650 4900 10900 4900
Wire Bus Line
	9350 4800 10850 4800
Wire Wire Line
	10650 3150 10850 3150
Wire Wire Line
	10650 3250 10850 3250
Wire Wire Line
	10650 3350 10850 3350
Wire Wire Line
	10650 3450 10850 3450
Wire Wire Line
	10650 3550 10850 3550
Wire Wire Line
	10650 3650 10850 3650
Wire Wire Line
	10650 3750 10850 3750
Wire Wire Line
	10650 3850 10850 3850
Wire Wire Line
	6550 6425 7150 6425
Wire Wire Line
	6550 5625 7150 5625
Wire Wire Line
	6550 5725 7150 5725
Wire Wire Line
	6550 5825 7150 5825
Wire Wire Line
	6550 5925 7150 5925
Wire Wire Line
	6550 6025 7150 6025
Wire Wire Line
	6550 6125 7150 6125
Wire Wire Line
	6550 6225 7150 6225
Wire Wire Line
	6550 6325 7150 6325
Wire Bus Line
	6850 4900 6850 6925
Wire Bus Line
	9350 2850 9350 4800
Wire Bus Line
	8100 2850 8100 4800
Wire Bus Line
	4350 4350 5050 4350
Wire Bus Line
	7050 4950 7050 6325
Wire Bus Line
	10950 3250 10950 4700
Wire Bus Line
	3150 4750 3950 4750
Wire Bus Line
	5500 4800 5500 6225
Wire Bus Line
	9650 2550 9650 4900
Wire Bus Line
	7100 2650 7100 4900
Wire Bus Line
	8350 2650 8350 4900
Wire Bus Line
	6850 2150 6850 4900
Wire Bus Line
	8700 4900 8700 6475
$EndSCHEMATC