exp_port.sch

EESchema Schematic File Version 4
EELAYER 30 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 8 12
Title "LittleSixteen"
Date "2021-12-05"
Rev "3git"
Comp "SukkoPera"
Comment1 "Licensed under CC BY-NC-SA 4.0"
Comment2 "WARNING: These schematics might contain errors!"
Comment3 ""
Comment4 ""
$EndDescr
Entry Wire Line
	7855 4990 7755 5090
Entry Wire Line
	7855 4890 7755 4990
Entry Wire Line
	7855 4790 7755 4890
Entry Wire Line
	7855 4690 7755 4790
Entry Wire Line
	7855 4590 7755 4690
Entry Wire Line
	7855 4490 7755 4590
Entry Wire Line
	7855 4390 7755 4490
Entry Wire Line
	7855 4290 7755 4390
Entry Wire Line
	7855 4190 7755 4290
Entry Wire Line
	7855 4090 7755 4190
Entry Wire Line
	7855 3990 7755 4090
Entry Wire Line
	7855 3890 7755 3990
Entry Wire Line
	7855 3790 7755 3890
Entry Wire Line
	7855 3690 7755 3790
Entry Wire Line
	7855 3590 7755 3690
Entry Wire Line
	7855 3490 7755 3590
Text GLabel 7230 3390 2    50   Input ~ 0
~RAS
Wire Bus Line
	7855 3490 8355 3490
Text GLabel 8355 3490 2    50   Input ~ 0
a[0..15]
Wire Wire Line
	4855 3190 4855 3290
Connection ~ 4855 3190
Wire Wire Line
	5105 3190 4855 3190
$Comp
L power:VCC #PWR0128
U 1 1 5E95A98C
P 4855 2475
F 0 "#PWR0128" H 4855 2325 50  0001 C CNN
F 1 "VCC" H 4872 2648 50  0000 C CNN
F 2 "" H 4855 2475 50  0001 C CNN
F 3 "" H 4855 2475 50  0001 C CNN
	1    4855 2475
	1    0    0    -1  
$EndComp
Wire Wire Line
	4855 2475 4855 3190
Wire Wire Line
	4855 3290 5105 3290
Text GLabel 3610 4290 0    50   Input ~ 0
d[0..7]
Wire Bus Line
	3910 4290 3610 4290
Text GLabel 4580 4190 0    50   Input ~ 0
MUX
Text GLabel 4305 4090 0    50   Input ~ 0
~CAS
Text GLabel 4570 3490 0    50   Input ~ 0
R_~W
$Comp
L Exp-Port:C16-Exp-Port CN1
U 1 1 5E91CB40
P 5855 4290
F 0 "CN1" H 5855 5855 50  0000 C CNN
F 1 "EXPANSION_CONNECTOR" H 5855 5764 50  0000 C CNN
F 2 "LittleSixteen:50Pin_Edge_Connector" H 5855 2640 50  0001 C CNN
F 3 "DOCUMENTATION" H 5855 2540 50  0001 C CNN
	1    5855 4290
	1    0    0    -1  
$EndComp
Text Label 6905 5090 2    60   ~ 0
a0
Wire Wire Line
	7230 3390 7005 3390
Wire Wire Line
	4305 4090 4665 4090
Wire Wire Line
	4580 4190 5105 4190
Wire Wire Line
	4570 3490 5105 3490
Text Label 6905 3590 2    60   ~ 0
a15
Text Label 6905 3690 2    60   ~ 0
a14
Text Label 6905 3790 2    60   ~ 0
a13
Text Label 6905 3890 2    60   ~ 0
a12
Text Label 6905 3990 2    60   ~ 0
a11
Text Label 6905 4090 2    60   ~ 0
a10
Text Label 6905 4190 2    60   ~ 0
a9
Text Label 6905 4290 2    60   ~ 0
a8
Text Label 6905 4390 2    60   ~ 0
a7
Text Label 6905 4490 2    60   ~ 0
a6
Text Label 6905 4590 2    60   ~ 0
a5
Text Label 6905 4690 2    60   ~ 0
a4
Text Label 6905 4790 2    60   ~ 0
a3
Text Label 6905 4890 2    60   ~ 0
a2
Wire Wire Line
	5105 4390 4010 4390
Wire Wire Line
	5105 4490 4010 4490
Wire Wire Line
	5105 4590 4010 4590
Wire Wire Line
	5105 4690 4010 4690
Wire Wire Line
	5105 4790 4010 4790
Wire Wire Line
	5105 4890 4010 4890
Wire Wire Line
	5105 4990 4010 4990
Wire Wire Line
	5105 5090 4010 5090
Wire Wire Line
	5005 3090 5105 3090
Wire Wire Line
	6605 3590 7755 3590
Wire Wire Line
	6605 3690 7755 3690
Wire Wire Line
	6605 3790 7755 3790
Wire Wire Line
	6605 3890 7755 3890
Wire Wire Line
	6605 3990 7755 3990
Wire Wire Line
	6605 4090 7755 4090
Wire Wire Line
	6605 4190 7755 4190
Wire Wire Line
	6605 4290 7755 4290
Wire Wire Line
	6605 4390 7755 4390
Wire Wire Line
	6605 4490 7755 4490
Wire Wire Line
	6605 4590 7755 4590
Wire Wire Line
	6605 4690 7755 4690
Wire Wire Line
	6605 4790 7755 4790
Wire Wire Line
	6605 4890 7755 4890
Wire Wire Line
	6605 5090 7755 5090
Text Label 5105 4390 2    60   ~ 0
d7
Text Label 5105 4490 2    60   ~ 0
d6
Text Label 5105 4590 2    60   ~ 0
d5
Text Label 5105 4690 2    60   ~ 0
d4
Text Label 5105 4790 2    60   ~ 0
d3
Text Label 5105 4890 2    60   ~ 0
d2
Text Label 5105 4990 2    60   ~ 0
d1
Text Label 5105 5090 2    60   ~ 0
d0
Text Label 6905 4990 2    60   ~ 0
a1
Entry Wire Line
	4010 4390 3910 4290
Entry Wire Line
	4010 4490 3910 4390
Entry Wire Line
	4010 4590 3910 4490
Entry Wire Line
	4010 4690 3910 4590
Entry Wire Line
	4010 4790 3910 4690
Entry Wire Line
	4010 4890 3910 4790
Entry Wire Line
	4010 4990 3910 4890
Entry Wire Line
	4010 5090 3910 4990
Wire Wire Line
	6605 4990 7755 4990
Wire Wire Line
	5005 3090 5005 5490
$Comp
L power:GND #PWR0129
U 1 1 5E966933
P 5005 5945
F 0 "#PWR0129" H 5005 5695 50  0001 C CNN
F 1 "GND" H 5010 5772 50  0000 C CNN
F 2 "" H 5005 5945 50  0001 C CNN
F 3 "" H 5005 5945 50  0001 C CNN
	1    5005 5945
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0130
U 1 1 5E966A94
P 6700 5945
F 0 "#PWR0130" H 6700 5695 50  0001 C CNN
F 1 "GND" H 6705 5772 50  0000 C CNN
F 2 "" H 6700 5945 50  0001 C CNN
F 3 "" H 6700 5945 50  0001 C CNN
	1    6700 5945
	1    0    0    -1  
$EndComp
Wire Wire Line
	6700 5945 6700 5490
Wire Wire Line
	6700 3090 6605 3090
Wire Wire Line
	5105 5490 5005 5490
Connection ~ 5005 5490
Wire Wire Line
	5005 5490 5005 5945
Wire Wire Line
	6605 5490 6700 5490
Connection ~ 6700 5490
Wire Wire Line
	6700 5490 6700 3090
$Comp
L ferrite_bead_small:Ferrite_Bead_Small FB38
U 1 1 5E9793EF
P 6905 3390
F 0 "FB38" V 6760 3390 50  0000 C CNN
F 1 "Ferrite_Bead_Small" V 6759 3390 50  0001 C CNN
F 2 "LittleSixteen:Ferrite" V 6835 3390 50  0001 C CNN
F 3 "~" H 6905 3390 50  0001 C CNN
	1    6905 3390
	0    1    1    0   
$EndComp
Wire Wire Line
	6805 3390 6605 3390
$Comp
L ferrite_bead_small:Ferrite_Bead_Small FB40
U 1 1 5E979856
P 4765 4090
F 0 "FB40" V 4625 4090 50  0000 C CNN
F 1 "Ferrite_Bead_Small" V 4619 4090 50  0001 C CNN
F 2 "LittleSixteen:Ferrite" V 4695 4090 50  0001 C CNN
F 3 "~" H 4765 4090 50  0001 C CNN
	1    4765 4090
	0    -1   1    0   
$EndComp
Wire Wire Line
	4865 4090 5105 4090
Wire Wire Line
	5105 4290 4305 4290
Text GLabel 4305 4290 0    50   Input ~ 0
BA
Wire Wire Line
	5105 5190 4305 5190
Text GLabel 4305 5190 0    50   Input ~ 0
AEC
Text GLabel 7440 3490 2    50   Input ~ 0
PHI0
Wire Wire Line
	7440 3490 7205 3490
$Comp
L ferrite_bead_small:Ferrite_Bead_Small FB39
U 1 1 5E982F3B
P 7105 3490
F 0 "FB39" V 6960 3490 50  0000 C CNN
F 1 "Ferrite_Bead_Small" V 6959 3490 50  0001 C CNN
F 2 "LittleSixteen:Ferrite" V 7035 3490 50  0001 C CNN
F 3 "~" H 7105 3490 50  0001 C CNN
	1    7105 3490
	0    1    1    0   
$EndComp
Wire Wire Line
	7005 3490 6605 3490
Text GLabel 4580 3990 0    50   Input ~ 0
~CS0
Wire Wire Line
	4580 3990 5105 3990
Wire Wire Line
	5105 3890 4305 3890
Text GLabel 4305 3890 0    50   Input ~ 0
~CS1
Wire Wire Line
	6605 3290 7440 3290
Text GLabel 7440 3290 2    50   Input ~ 0
~RESET
Text GLabel 7230 3190 2    50   Input ~ 0
C1_LOW
Wire Wire Line
	6605 3190 7230 3190
Wire Wire Line
	5105 3690 4305 3690
Text GLabel 4305 3690 0    50   Input ~ 0
C2_LOW
Text GLabel 4580 3790 0    50   Input ~ 0
C2_HIGH
Wire Wire Line
	4580 3790 5105 3790
Text GLabel 4580 3590 0    50   Input ~ 0
C1_HIGH
Wire Wire Line
	4580 3590 5105 3590
Text GLabel 4580 3390 0    50   Input ~ 0
~IRQ
Wire Wire Line
	4580 3390 5105 3390
Text GLabel 4305 5390 0    50   Input ~ 0
PHI2
Wire Wire Line
	4305 5390 5105 5390
Text GLabel 4580 5290 0    50   Output ~ 0
EXT_AUDIO
Wire Wire Line
	4580 5290 5105 5290
Text GLabel 7230 5190 2    50   Output ~ 0
RAMEN
Wire Wire Line
	6605 5190 6855 5190
Wire Notes Line
	6375 5115 7575 5115
Wire Notes Line
	7575 5115 7575 5260
Wire Notes Line
	7575 5260 6375 5260
Wire Notes Line
	6375 5260 6375 5115
Text Notes 7635 5710 0    50   ~ 0
On the Plus/4 schematics from the German User's guide, the\nZ pin is reported as "RAMEN (NC)". On the actual boards it is\nactually NC, but then why not use it as a real "RAM Enable"\nsignal to solve the problem of external RAM expansions not\nworking? :)\nWe add a jumper just in case some old cart has Z grounded\nwhile it shouldn't.
$Comp
L Device:Jumper_NC_Small JP8
U 1 1 61F43269
P 6955 5190
F 0 "JP8" H 6955 5030 50  0000 C CNN
F 1 "JP_RAMEN" H 6955 4930 50  0000 C CNN
F 2 "Jumper:SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm" H 6955 5190 50  0001 C CNN
F 3 "~" H 6955 5190 50  0001 C CNN
	1    6955 5190
	1    0    0    -1  
$EndComp
Wire Wire Line
	7055 5190 7230 5190
Wire Wire Line
	10280 3965 10280 3900
$Comp
L Device:C C?
U 1 1 6349BFDB
P 10280 4115
AR Path="/5EACE220/6349BFDB" Ref="C?"  Part="1" 
AR Path="/5E6A379E/6349BFDB" Ref="C94"  Part="1" 
F 0 "C94" H 10395 4161 50  0000 L CNN
F 1 "100n/25V" H 10395 4070 50  0000 L CNN
F 2 "Capacitor_THT:C_Disc_D8.0mm_W2.5mm_P5.00mm" H 10318 3965 50  0001 C CNN
F 3 "~" H 10280 4115 50  0001 C CNN
	1    10280 4115
	1    0    0    -1  
$EndComp
Wire Wire Line
	10280 4265 10280 4325
$Comp
L power:VCC #PWR0149
U 1 1 6349D8C1
P 10280 3900
F 0 "#PWR0149" H 10280 3750 50  0001 C CNN
F 1 "VCC" H 10297 4073 50  0000 C CNN
F 2 "" H 10280 3900 50  0001 C CNN
F 3 "" H 10280 3900 50  0001 C CNN
	1    10280 3900
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0150
U 1 1 6349E0F9
P 10280 4325
F 0 "#PWR0150" H 10280 4075 50  0001 C CNN
F 1 "GND" H 10285 4152 50  0000 C CNN
F 2 "" H 10280 4325 50  0001 C CNN
F 3 "" H 10280 4325 50  0001 C CNN
	1    10280 4325
	1    0    0    -1  
$EndComp
Text Notes 10045 4725 0    50   ~ 0
Additional\ndecoupling cap
Wire Bus Line
	3910 4290 3910 4990
Wire Bus Line
	7855 3490 7855 4990
$EndSCHEMATC