Address Decoding - Classe Audio SSP-75 Service Manual

CONTROL
IC18
23 32
ROM_CE CE VCC
25
ROM_OE OE
A0
11 13
A0 DQ0
A1
10 14
A1 DQ1
A2
9 15
A2 DQ2
A3
8 18
A3 DQ3
A4
7 19
A4 DQ4
A5
6 20
A5 DQ5
A6
5 21
A6 DQ6
A7
4 22
A7 DQ7
A8
29
A8
A9
28
A9
A10
24 1
A10 nc1
A11
27 12
A11 nc2
A12
3 17
A12 nc3
A13
30 26
A13 nc4
A14
31
A14
A15
2 16
A15 GND
27C512 on PLCC socket
M_BUS
IC17
+5D
32k X 8 SRAM
20 28
SRAM_CE CE VCC
22
SRAM_OE OE
27
WE
R/W
A0 AD0
10 11
A0 DQ0
A1 AD1
9 12
A1 DQ1
A2 AD2
8 13
A2 DQ2
A3 AD3
7 15
A3 DQ3
A4 AD4
6 16
A4 DQ4
A5 AD5
5 17
A5 DQ5
A6 AD6
4 18
A6 DQ6
A7 AD7
3 19
A7 DQ7
A8
25
A8
A9
24
A9
A10
21
A10
A11
23
A11
A12
2
A12
A13
26
A13 M_BUS
A14
1 14
A14 GND
M_BUS
VOL_ROT_1
VOL_ROT_2
Bypass capacitors
+5D
C81
C76 C75 C82 C60 C67 C73
100uF
100nF 100nF 100nF 100nF 100nF 100nF
+5D
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
M_BUS
+5D
R76
330
TP8
Q1
Not installed
BC848B
IC16
R72
1 3
RESET_MYSELF Vcc
0 C74
2
R74
RESET
100nF
10k
1
DGND
4
DGND
DS1233DZ-10
Interrupt buffers
+5D
IC12A
IC15B
4 14
PRE VCC
4
6 3 5
CLK Q
5 2 6
D Q
74HC86
1 7
ACK_INT CLR GND
74HC74
+5D
IC12B
IC15C
+5D 10
PRE
9
8 11 9
CLK Q
10 12 8
D Q
74HC86
13
ACK_INT CLR
R56 74HC74
TP13
10k
Not installed
+5D
14
VCC
1
C80 C99
100uF 100uF 3
2
IC15A
74HC86
7
GND
TP4 PCB testpoint, ignore
R81 75
CONTROL_SCLK
+5D
R82 75
CONTROL_MOSI
+5D CONTROL_MISO
C79 C78
100uF 100nF
R70
+5D 100
52
Vrh
51
Vrl
50
COMP_ACT PE7/AN7
48
SVIDEO_ACT PE6/AN6
46
VOL_ROT_1 PE5/AN5
44
IC20
VOL_ROT_2 PE4/AN4
49
MC68HC11E1 on PLCC socket
TUNED PE3/AN3
47
TUNER_STEREO PE2/AN2
45
AD_OVER PE1/AN1
43
ZONE1_CVID_ACT PE0/AN0
17
RESET
18
XIRQ
+5D 19
IRQ
R67
1M
+5D
X20
R83
8MHz 10k
C70 C71
22pF 22pF

Address decoding

D2
BAS16
+5D
IC24
PALCE16V8-25 on PLCC socket
A10
1 20
CLK/I0 VCC
A9
2 12
I1 I/O0 IO_SEL
E
3 13
I2 I/O1 SRAM_OE
R/W
4 14
I3 I/O2 SRAM_CE
D1 A11
5 15
I4 I/O3 ROM_OE
A12
6 16
I5 I/O4
BAS16 A13
7 17
I6 I/O5
A14
8 18
I7 I/O6
A15
9 19
I8 I/O7
A8
11 10
OE/I9 GND
TxD
RxD
R71
10k
IC19
74HC573
+5D
1 20
OE VCC
AS 11
CLK
9 AD0 AD0 2 19 A0
PC0/A0/D0 1D 1Q
10 AD1 AD1 3 18 A1
PC1/A1/D1 2D 2Q
11 AD2 AD2 4 17 A2
PC2/A2/D2 3D 3Q
12 AD3 AD3 5 16 A3
PC3/A3/D3 4D 4Q
13 AD4 AD4 6 15 A4
PC4/A4/D4 5D 5Q
14 AD5 AD5 7 14 A5
PC5/A5/D5 6D 6Q
15 AD6 AD6 8 13 A6
PC6/A6/D6 7D 7Q
16 AD7 AD7 9 12 A7
PC7/A7/D7 8D 8Q
42 A8
PB0/A8
41 A9 10
PB1/A9 GND
40 A10
PB2/A10
39 A11
PB3/A11
38 A12
PB4/A12
37 A13
PB5/A13
36 A14
PB6/A14
35 A15
PB7/A15
C77
100nF
IC23
74AC138
VSYNC_OUT
L7
KBD_ACTIVE 16
Vcc
Ferrite bead
ZONE_2_REMOTE_BUF
ZONE_1_REMOTE_BUF A0 1 15
A0 Y0 EN_CTLR0
ACK_INT A1 2 14
A1 Y1 EN_CTLR1
RF_RESET A2 3 13
A2 Y2 AUDIO_I/O_RCK
RESET_MYSELF 12
Y3 OSD_I/O_RCK
I/O_ENABLE 11
Y4 KBD_I/O_RCK
4 10
IO_SEL E1 Y5 LED_I/O_RCK
5 9
E2 Y6 VFD_I/O_RCK
E
6 7
E3 Y7
8
GND
+5D
ROM_CE
TP5 PCB testpoint, ignore
TP10 PCB testpoint, ignore
TP9 PCB testpoint, ignore
SSP-75
M_BUS
+5D
IC15D
12
11
VFD_E
13
74HC86
Classé - 46