timer.sch

EESchema Schematic File Version 4
EELAYER 30 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 12 16
Title "Wugo PCII System Board"
Date ""
Rev "1.0"
Comp ""
Comment1 "Schematics Copyright (c) 2020 David J. Fiddes <D.J@fiddes.net>"
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
L Timer:8253 IC?
U 1 1 5F2EBEAA
P 2800 3700
AR Path="/5EC569ED/5F2EBEAA" Ref="IC?"  Part="1" 
AR Path="/5F2E6CA0/5F2EBEAA" Ref="IC56"  Part="1" 
F 0 "IC56" H 2450 4650 50  0000 C CNN
F 1 "8253" H 3100 4650 50  0000 C CNN
F 2 "Package_DIP:DIP-24_W15.24mm" H 2850 3950 50  0001 C CNN
F 3 "http://www.cpcwiki.eu/imgs/e/e3/8253.pdf" H 2350 4600 50  0001 C CNN
	1    2800 3700
	1    0    0    -1  
$EndComp
$Comp
L Connector:Conn_01x04_Male SPK1
U 1 1 5F2EBFC8
P 8200 2100
F 0 "SPK1" H 8172 2074 50  0000 R CNN
F 1 "SPEAKER" H 8172 1983 50  0000 R CNN
F 2 "" H 8200 2100 50  0001 C CNN
F 3 "~" H 8200 2100 50  0001 C CNN
	1    8200 2100
	-1   0    0    -1  
$EndComp
$Comp
L power:+5V #PWR086
U 1 1 5F2ECC14
P 7800 1850
F 0 "#PWR086" H 7800 1700 50  0001 C CNN
F 1 "+5V" H 7815 2023 50  0000 C CNN
F 2 "" H 7800 1850 50  0001 C CNN
F 3 "" H 7800 1850 50  0001 C CNN
	1    7800 1850
	1    0    0    -1  
$EndComp
Wire Wire Line
	8000 2300 7800 2300
Wire Wire Line
	7800 2300 7800 2100
Wire Wire Line
	8000 2100 7800 2100
Connection ~ 7800 2100
Wire Wire Line
	7800 2100 7800 1850
$Comp
L power:GND #PWR087
U 1 1 5F2ED3A7
P 7900 2450
F 0 "#PWR087" H 7900 2200 50  0001 C CNN
F 1 "GND" H 7905 2277 50  0000 C CNN
F 2 "" H 7900 2450 50  0001 C CNN
F 3 "" H 7900 2450 50  0001 C CNN
	1    7900 2450
	1    0    0    -1  
$EndComp
Wire Wire Line
	8000 2200 7900 2200
Wire Wire Line
	7900 2200 7900 2400
$Comp
L Device:R R28
U 1 1 5F2ED91A
P 7450 2000
F 0 "R28" V 7243 2000 50  0000 C CNN
F 1 "10R" V 7334 2000 50  0000 C CNN
F 2 "" V 7380 2000 50  0001 C CNN
F 3 "~" H 7450 2000 50  0001 C CNN
	1    7450 2000
	0    1    1    0   
$EndComp
Wire Wire Line
	8000 2000 7600 2000
$Comp
L Transistor_BJT:2N3904 Q1
U 1 1 5F2EDECD
P 6400 2200
F 0 "Q1" H 6590 2246 50  0000 L CNN
F 1 "2N3904" H 6590 2155 50  0000 L CNN
F 2 "Package_TO_SOT_THT:TO-92_Inline" H 6600 2125 50  0001 L CIN
F 3 "https://www.fairchildsemi.com/datasheets/2N/2N3904.pdf" H 6400 2200 50  0001 L CNN
	1    6400 2200
	1    0    0    -1  
$EndComp
Wire Wire Line
	7900 2400 7050 2400
Connection ~ 7900 2400
Wire Wire Line
	7900 2400 7900 2450
Wire Wire Line
	6500 2000 7050 2000
$Comp
L Device:C C24
U 1 1 5F2EF404
P 7050 2200
F 0 "C24" H 7165 2246 50  0000 L CNN
F 1 "100nF" H 7165 2155 50  0000 L CNN
F 2 "" H 7088 2050 50  0001 C CNN
F 3 "~" H 7050 2200 50  0001 C CNN
	1    7050 2200
	1    0    0    -1  
$EndComp
Wire Wire Line
	7050 2000 7050 2050
Connection ~ 7050 2000
Wire Wire Line
	7050 2000 7300 2000
Wire Wire Line
	7050 2350 7050 2400
Connection ~ 7050 2400
Wire Wire Line
	7050 2400 6500 2400
$Comp
L Device:R R24
U 1 1 5F2F0D4F
P 6050 2050
F 0 "R24" H 5980 2004 50  0000 R CNN
F 1 "4K7" H 5980 2095 50  0000 R CNN
F 2 "" V 5980 2050 50  0001 C CNN
F 3 "~" H 6050 2050 50  0001 C CNN
	1    6050 2050
	-1   0    0    1   
$EndComp
Wire Wire Line
	6050 2200 6200 2200
$Comp
L 74xx:74LS00 IC84
U 3 1 5F2F4453
P 5550 2200
F 0 "IC84" H 5550 2525 50  0000 C CNN
F 1 "74LS00" H 5550 2434 50  0000 C CNN
F 2 "" H 5550 2200 50  0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 5550 2200 50  0001 C CNN
	3    5550 2200
	1    0    0    -1  
$EndComp
Wire Wire Line
	5850 2200 6050 2200
Connection ~ 6050 2200
Text Label 2000 3000 0    50   ~ 0
XD0
Text Label 2000 3100 0    50   ~ 0
XD1
Text Label 2000 3200 0    50   ~ 0
XD2
Text Label 2000 3300 0    50   ~ 0
XD3
Text Label 2000 3400 0    50   ~ 0
XD4
Text Label 2000 3500 0    50   ~ 0
XD5
Text Label 2000 3600 0    50   ~ 0
XD6
Text Label 2000 3700 0    50   ~ 0
XD7
Wire Wire Line
	2000 3000 2200 3000
Wire Wire Line
	2000 3100 2200 3100
Wire Wire Line
	2000 3200 2200 3200
Wire Wire Line
	2000 3300 2200 3300
Wire Wire Line
	2000 3400 2200 3400
Wire Wire Line
	2000 3500 2200 3500
Wire Wire Line
	2000 3600 2200 3600
Wire Wire Line
	2000 3700 2200 3700
Wire Wire Line
	1750 3900 2200 3900
Wire Wire Line
	2000 4000 2200 4000
Wire Wire Line
	2000 4100 2200 4100
Wire Wire Line
	2000 4200 2200 4200
Text Label 2000 4100 0    50   ~ 0
XA0
Text Label 2000 4200 0    50   ~ 0
XA1
Wire Wire Line
	4250 3300 3400 3300
Wire Wire Line
	3400 3700 3550 3700
Wire Wire Line
	3550 3700 3550 3200
Wire Wire Line
	3550 2700 2800 2700
Wire Wire Line
	3400 3200 3550 3200
Connection ~ 3550 3200
Wire Wire Line
	3550 3200 3550 2700
Wire Wire Line
	3400 3100 3700 3100
Wire Wire Line
	3400 3600 3700 3600
Wire Wire Line
	3700 3600 3700 3100
Connection ~ 3700 3100
Wire Wire Line
	3700 3100 4250 3100
Wire Wire Line
	3700 3600 3700 4100
Wire Wire Line
	3700 4100 3400 4100
Connection ~ 3700 3600
Text GLabel 7200 3700 2    50   Output ~ 0
DRQ0
Text Notes 6200 4350 0    50   ~ 0
DMA memory refresh tick
Wire Wire Line
	6700 3700 7200 3700
Wire Wire Line
	6400 4200 6000 4200
Wire Wire Line
	6400 4100 6400 4200
Text GLabel 6000 4200 0    50   Input ~ 0
~DACK0~
NoConn ~ 6700 3900
Wire Wire Line
	6100 3700 6100 3500
Wire Wire Line
	6100 3500 6400 3500
$Comp
L 74xx:74LS74 IC?
U 1 1 5F38B815
P 6400 3800
AR Path="/5EC54617/5F38B815" Ref="IC?"  Part="1" 
AR Path="/5F2E6CA0/5F38B815" Ref="IC69"  Part="1" 
F 0 "IC69" H 6200 4150 50  0000 C CNN
F 1 "74LS74" H 6650 4100 50  0000 C CNN
F 2 "" H 6400 3800 50  0001 C CNN
F 3 "74xx/74hc_hct74.pdf" H 6400 3800 50  0001 C CNN
	1    6400 3800
	1    0    0    -1  
$EndComp
$Comp
L power:+5V #PWR085
U 1 1 5F38DC92
P 6400 3400
F 0 "#PWR085" H 6400 3250 50  0001 C CNN
F 1 "+5V" H 6415 3573 50  0000 C CNN
F 2 "" H 6400 3400 50  0001 C CNN
F 3 "" H 6400 3400 50  0001 C CNN
	1    6400 3400
	1    0    0    -1  
$EndComp
Wire Wire Line
	6400 3400 6400 3500
Connection ~ 6400 3500
$Comp
L power:+5V #PWR084
U 1 1 5F3919C0
P 2800 2600
F 0 "#PWR084" H 2800 2450 50  0001 C CNN
F 1 "+5V" H 2815 2773 50  0000 C CNN
F 2 "" H 2800 2600 50  0001 C CNN
F 3 "" H 2800 2600 50  0001 C CNN
	1    2800 2600
	1    0    0    -1  
$EndComp
Wire Wire Line
	2800 2600 2800 2700
Connection ~ 2800 2700
Wire Wire Line
	3400 4200 3950 4200
$Comp
L 74xx:74LS00 IC84
U 4 1 5F3BB5DE
P 4400 4850
F 0 "IC84" H 4400 5175 50  0000 C CNN
F 1 "74LS00" H 4400 5084 50  0000 C CNN
F 2 "" H 4400 4850 50  0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 4400 4850 50  0001 C CNN
	4    4400 4850
	1    0    0    -1  
$EndComp
Wire Wire Line
	3400 4300 3800 4300
Wire Wire Line
	3800 4300 3800 4750
Wire Wire Line
	3800 4750 4100 4750
Wire Wire Line
	3400 3800 6100 3800
Wire Wire Line
	4700 4850 5000 4850
Wire Wire Line
	5250 2100 5250 2200
Wire Wire Line
	5250 2200 5000 2200
Connection ~ 5250 2200
Wire Wire Line
	5250 2200 5250 2300
Wire Wire Line
	5000 2200 5000 4850
Wire Wire Line
	3950 4950 4100 4950
Wire Wire Line
	3800 4300 3950 4300
Connection ~ 3800 4300
Text GLabel 1800 4400 0    50   Input ~ 0
~TIMER_CS~
Text GLabel 1750 3900 0    50   Input ~ 0
~XIOR~
Text GLabel 2000 4000 0    50   Input ~ 0
~XIOW~
Entry Wire Line
	1900 4300 2000 4200
Entry Wire Line
	1900 4200 2000 4100
Wire Wire Line
	1800 4400 2200 4400
Wire Bus Line
	1900 4200 1900 4300
Wire Bus Line
	1900 4300 1350 4300
Text GLabel 1350 4300 0    50   Input ~ 0
XA[0..19]
Entry Wire Line
	1900 2900 2000 3000
Entry Wire Line
	1900 3000 2000 3100
Entry Wire Line
	1900 3100 2000 3200
Entry Wire Line
	1900 3200 2000 3300
Entry Wire Line
	1900 3300 2000 3400
Entry Wire Line
	1900 3400 2000 3500
Entry Wire Line
	1900 3500 2000 3600
Entry Wire Line
	1900 3600 2000 3700
Wire Bus Line
	1900 2750 1350 2750
Text GLabel 1350 2750 0    50   3State ~ 0
XD[0..7]
$Comp
L power:GND #PWR0137
U 1 1 61391A6C
P 2800 4750
F 0 "#PWR0137" H 2800 4500 50  0001 C CNN
F 1 "GND" H 2805 4577 50  0000 C CNN
F 2 "" H 2800 4750 50  0001 C CNN
F 3 "" H 2800 4750 50  0001 C CNN
	1    2800 4750
	1    0    0    -1  
$EndComp
Wire Wire Line
	2800 4700 2800 4750
NoConn ~ 6050 1900
Text Notes 5750 1800 0    50   ~ 0
This makes no sense and appears \nto be a tracking error
Text GLabel 4250 3100 2    50   Input ~ 0
TIMER_CLOCK
Text GLabel 4250 3300 2    50   Output ~ 0
IRQ0
Text GLabel 3950 4200 2    50   Input ~ 0
TIMER2_GATE_SPEAKER
Text GLabel 3950 4300 2    50   Output ~ 0
TIMER2_OUT
Text GLabel 3950 4950 0    50   Input ~ 0
SPEAKER_DATA
Wire Bus Line
	1900 2750 1900 3600
$EndSCHEMATC