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ZX80 Schematic
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ZX80 Schematic
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ZX80 CIRCUIT DIAGRAM. 5V. 0V. C1. C2. C4. C5. C6. 47n. 47n 47n 47n 47n. CPU. 2. 2. CPU. 5V 9V SLOT 0V. A0 A1 A2 A3 A15 A14 A13 A12 A11 A10 A9 A8 ...
ZX80 CIRCUIT DIAGRAM 9V - 11V
RF (VIDEO)
EDGE CONNECTORS
5V
MIC
EAR
5V
R33
23B 5V 9V SLOT
0V
A0
A1
A2
A3
A15 A14 A13 A12 A11 A10 A9
A8 A7
A6
A5
A4
N/C
UM 1233
R30
VIDEO
R32
SYNC
1K
MODULATOR
+
330 R31 0V
R35
0V
C12 47N
23A D7'
SLOT D0' D1' D2'
C2
C1
RD WR BUSAC BUSRQ M1 REFSH RESET WAIT IORQ REG C5 C6
C4
5V
R29 180
+
D6' D5' D3' D4' INT NMI MALT MREQ
RAM C.S.
0V
C8 22u 16V
1M C14 SYNC 47p C13
R34 1K
IC22
47n
0V 0V
47n
47n
47n
47n
47n 0V
A0 - A15 A6 5V
5V 10
WR
7 6 5 4 3 2 1
VCC
IC3 D7'
2114
14 13 12 11
D1' D0' D2'
RAM
RAM
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9
17 16 15
8
10
WR
7 6 5 4 3 2 1 17 16 15
VCC
IC4 D4'
14
2114-1
D3' D5' D6'
13 12 11
RAM
8
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9
9
9
0V
D4'
0V
D3' D5' D6' D2'
R1 1K
D11 5V
0V VCC
1
IC10
15
2
D7
14 4 12 6 10
D4 D3 D2 D0 D1
5V
(USA 60HZ 525 LINES ONLY)
16
16
A0'
GND
KBD 10 15
CH
0V 2
CK
GND
Q
R9
5V
780-1
D4 D3 D5 D6 D2 D7 D0 D1
A1
6
13
A2
14 3 2
A3
5V
B
4
Y
A8
3
M1
28
R22 1K R23 1K
R21 220K
27
26 RESET 25 17 INT BUSRQ 24 NMI 18 WAIT HALT 23 19 BUSAC 22 20 MREQ WR IORQ 21 RD
VCC
GND
6 5 15 16 19 2 12
7 4 14 17 18 3 13
D7'
29
5
23
2
20
9
Y
IC7
Y
3
4
2
14
14 9
4
14
5
11
17
13
20
10
20
D6'
D0' - D7' 5
A14'
11
16
13
13
C11 47p
12
12
2 3
RST
R20 330
SYNC
GND MREQ
10
1
8
4
6
3
12
5
12
11
5
2
9
M1 5V
R24 1K
5V
4
6
20
5
4
D
0V
PR
18 4
8
15
3
6
R18 1K
11 12
6
Q
5V
1 CLR
D
3
19
9
2
Q
CLR PR 10 13
Q D
PR
5
19 4
Q 6 1 CLR
SYNC
3 1 2
RFSH
2
12
4
3
13
16
13
0V
IORQ 1
2
13
10 9
MREQ
4
RAM C.S.
R19 2K2
A14'
17
6
WR
9
2
12
10
5
8
12
11
8
11
11
11 13
12
3
13
A0
17
17 1
RD
KBD
9 Q
D
1
A15'
13
11
R25 470
5V
0V
9 8 11
8
9
11
C15 0-330p
12
B C D
IC21
13
11
5
HALT
16
1
0V
11
5V
VCC
13
9
2
12
1K
5V
RFSH
0V
2 10
1
R27
D5' D4' D3' D2' D1' D0'
R28 47K
0V
12 6
5 4
6
5
10
M1 3
D7' D6'
12
VIDEO
2
8
A7'
0V 10
15
MREQ
9
A12
GND
6
5V
0V
11
14 1
8
21
15
GND
A
2
9
15
6.5M
12
14 3
1
2
2
14
3
X1
20
4
15
A11
D6'
A
0V 10
A6'
1
3 6
18
14 13 11 10 9
B
10
5V
8
A9 A10
17 16 15
A4' A5'
12 Y 1
0V
C9 R2 47p 470
R3 1K
CS2
ROM 4
7
8
11
22 19
IC2
+5V
GND
C
CS1
Y
VCC
A
A7 13 14
VCC
A8'
0V
B
IC5
1
7 1
16
A
3
A6
8 A0' 7 A1' 6 A2' 5 A3'
GND
9
8
0V
A8'
5V 24
15
B A
A4 10 B 11 A A5 6 B
20
C10 1u 0V
4
8
5V
+
A15'
Y
0V
D0' D5' D1' D2' D3' D4'
12
Y
8 RFSH
A14'
A
6 5
15
GND
Y
B
2
1
A B A
A3'
9
Y
IC6
A15 13 B 14 A
A2'
12
5V
VCC
B 11 A
A1'
Y 7 Y
A
A14 10
9
Y
IC8
B
5
16
R12
16
VCC
13
0V
13
A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
10 B 11 A
B
9
7
8
7 8 9 10 12 13 14 15
R8
IC1
A0
A10
40 39 38 37 36 35 34 33 32 31 30
VCC
6
CPU
9 x 1K
R6 R7
R10 R11
1 2 3 4 5
1 S/L 3 D4 14 D3 4 D5 5 D6 D2 13 D7 6 D0 11 12 D1 Q
0V 13 5 11 7 9
R4 R5
D0'
IC9
5V 16
11 A11 A12 A13 A14 A15
D7'
D1'
VCC 8
3
5V
GND
GND
C.S.
INT
18
18
A10
A9
18
A11
A13
A12
11
Q
15
A15'
A14'
A8' 8
10
D3
5V
D4
D5
D6
D7
D8
D9
D10
CPU 3.2 MHz 13
5V R16
15
12
1
2 Q
R17 R13
3
4
W A
E S
5 R
D
6 T
F
7 Y
G
8 U
H
9 I
J
0 O
K
P L
R14 SHIFT
R15 47K x 5
Z
X
C
V
B
N
M
SPACE
NEW LINE
IC
TYPE NO
IC
TYPE NO
1 2 3 4 5 6 7 8 9 10 11
780 - 1 8332 2114 2114 - 1 74LS373 74LS157 74LS157 74LS157 74LS165 74LS365 74LS00
12 13 14 15 16 17 18 19 20 21 22
74LS00 74LS04 74LS05 74LS05 74LS10 74LS32 74LS74 74LS74 74LS86 74LS93 7805
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