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+5V
+5V
<19>
B1 A1
F5 A5
<17>
IA[0..23]
IA[0..23]
LATCH/BUFFER
F1
161 9
60
44
43 27
26
10
32CG16
(TOP)
U340
VISUAL AID
<17>
AD[0..15]
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD0
47
AD1
46
AD2
45
AD3
44
AD4
43
AD5
42
AD6
41
AD7
40
AD8
38
AD9
37
AD10
36
AD11
35
AD12
34
AD13
33
AD14
32
AD15
31
A16
29
A17
28
A18
27
A19
25
A20
24
A21
23
A22
22
A23
21
VCCL
20
VCCCTTL
54
VCCFCLK
51
VCCAD
30
VCCIO
3
VSSL
63
VSSFCLK
52
VSSNTSO
56
VSSHAD
26
VSSLAD
39
VSSIO
10
ST0
12
ST1
11
ST2
9
ST3
8
HOLDA
1
DBE
53
HBE
2
PFS
7
ILO
13
TSO
59
U/S
16
BPU
17
WR
58
RD
57
RSTO
67
FCLK
49
CTTL
55
PHI1
48
PHI2
50
DDIN
6
ADS
5
SPC
4
RSTI
61
WAIT2
65
CWAIT
64
WAIT1
66
RESERVED
19
RESERVED
18
OSCOUT
60
OSCIN
62
HOLD
68
INT
15
NMI
14
U340
32CG16-10
1
2
3
4
5
6
7
8
9
10
R355
10K
AD[0..15]
IA0
IA2
IA3
IA13
IA15
IA18
+5V
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
ADS
D0
3
Q0
2
D1
4
Q1
5
D2
7
Q2
6
D3
8
Q3
9
D4
13
Q4
12
D5
14
Q5
15
D6
17
Q6
16
D7
18
Q7
19
G
11
OC
1
U137
74ALS373
<18>
D3
<20>
IA0
IA0
IA1
IA2
IA3
IA4
IA5
IA6
IA7
<21>
IA8
IA9
IA10
IA11
IA12
IA13
IA14
IA15
AD8
AD9
AD10
AD11
AD12
AD13
AD14
AD15
ADS
HOLDA
D0
3
Q0
2
D1
4
Q1
5
D2
7
Q2
6
D3
8
Q3
9
D4
13
Q4
12
D5
14
Q5
15
D6
17
Q6
16
D7
18
Q7
19
G
11
OC
1
U135
74ALS373
ADS
IA1
IA14
IA17
/ADS
2
3
1
U120A
74ALS02
5
6
4
U120B
74ALS02
NC
NC
AD7
AD8
AD9
AD10
AD11
AD12
AD13
AD14
AD15
IA16
IA17
IA18
MICROPROCESSOR
<20>
D4
/HOLD
C434
22PF
Y435
20MHZ
C433
33PF
+5V
R435
75.0
D
12
Q
9
CK
11
Q
8
P
R
1
0
C
L
1
3
U535B
74ALS74
NC
NC
NC
NC
OSCIN
OSCOUT
/HOLDA
IA19
IA20
IA21
IA22
IA23
/LHOLD
R436
267.0K
<17>
A5
/HOLDA
NC
NC
NC
1
2
3
4
5
6
7
8
9
10
R360
10K
HOLDA
IA16
IA23
/NMI
/RSTI
/HOLDA
+5V
AD0
AD1
AD2
AD3
AD4
AD5
AD6
HOLDA
A1
2
B1
18
A2
3
B2
17
A3
4
B3
16
A4
5
B4
15
A5
6
B5
14
A6
7
B6
13
A7
8
B7
12
A8
9
B8
11
G
19
DIR
1
U145
74ALS1245
ID[0..15]
ID0
ID1
ID2
ID3
ID4
ID5
ID6
ID[0..15]
<17> <18>
<19> <20> <21>
H1 C4
A1 A1 A1
C240
.1UF
C137
.1UF
C140
.1UF
C145
.1UF
+5V
+5V +5V
+5V
C135
.1UF
C142
.1UF
ID7
ID0
ID1
ID2
ID3
ID4
ID5
ID6
+5V
+5V
<18>
D3
/LRC
AD7
AD8
AD9
AD10
AD11
AD12
AD13
AD14
/DDIN
/LDTA
A1
2
B1
18
A2
3
B2
17
A3
4
B3
16
A4
5
B4
15
A5
6
B5
14
A6
7
B6
13
A7
8
B7
12
A8
9
B8
11
G
19
DIR
1
U140
74ALS1245
NC
WAIT STATE
/HOLDA
/DBE
/HBE
/WAIT1
/WAIT2
IA0
/ADS
/DDIN
I/CK
1
I
2
I
3
I
4
I
5
I
6
I
7
I
8
I
9
I/O
19
I/O
18
I/O
17
I/O
16
I/O
15
I/O
14
I/O
13
I/O
12
I/OE
11
U350
16V8-25Q
<21>
<17>
<21>
<17>
A3
A4
G5
<18>
D3 A2
<19>
<17>
G5
<18>
D3
A2
<19>
<19>
D3 A4
<21>
A4
/HBE
/RD
/WR
/RSTO
/DBE
NC
NC
NC
NC
NC
/RSTO/RSTI
/WR
/RD
/DBE
FCLK
/HBE
/LINT
/NMI
NC
NC
J342
MICROPROCESSOR RESTART
CTTL
CTTL
+5V
+5V
D
2
Q
5
CK
3
Q
6
P
R
4
C
L
1
U535A
74ALS74
1
2
J342
<19>
C2
/INT
INSTALLED NON-MASKABLE INTERRUPT
TO PROCESSOR
REMOVED NORMAL OPERATION
J344
REMOVED NORMAL OPERATION
INSTALLED RESETS PROCESSOR
MICROPROCESSOR RESET
NC
NC
NC
/WAIT1
CTTL
/DDIN
/ADS/WAIT2
CTTL
/NMI
+5V
<17>
<17>
<17>
A5
A5
<21>
A2
<17>
A4 B2
<19>
A4
FCLK
CTTL
/DDIN
/ADS
NC
INT. CHIP SELECT
/LDTA
/SDTA
/HDTA
IA23
IA22
IA21
IA20
IA19
IA18
<17>
A5
AD15
AD8
AD9
AD10
AD11
AD12
AD13
/DDIN
/SDTA
A1
2
B1
18
A2
3
B2
17
A3
4
B3
16
A4
5
B4
15
A5
6
B5
14
A6
7
B6
13
A7
8
B7
12
A8
9
B8
11
G
19
DIR
1
U142
74ALS1245
C335
.1UF
C344
1UF
C450
.1UF
ID7
ID8
ID9
ID10
ID11
ID12
ID13
+5V
+5V
+5V
C336
.1UF
C342
.1UF
C440
.1UF
C534
.1UF
C445
.1UF
+5V +5V
+5V +5V
+5V
SEE ELECTRICAL PARTS LIST
PARTS WITHIN BOX
HAVE BEEN CHANGED
IN REAR OF MANUAL
ID14
ID15
<19>
<17>
<19>
<21>
<17>
J115-22
J115-24
J115-26
G5
D4
A2
B3
A5
C5
G4
A2 AD14
AD15
/DDIN
/HDTA
NC
NC
NC
RSTO
/ROMCS
/UARTCS
/ADMUX
/MISCS
/ADCS
/NVRAMCS
/CSKEY
/CSTP
/CSRE
IA18
IA19
IA20
IA21
IA22
/RD
/WR
/RSTO
I/CK
1
I
2
I
3
I
4
I
5
I
6
I
7
I
8
I
9
I
10
I
11
I
13
I/O
23
I/O
22
I/O
21
I/O
20
I/O
19
I/O
18
I/O
17
I/O
16
I/O
15
I/O
14
U345
22V10-25
/RSTI
<18>
D2
RESIN
2
SENSE
7
GND
4
VCC
8
RST
5
RST
6
REF
1
CT
3
U344
TL7705A
C540
.1UF
RST
RST
/RSTI
+5V
R431
10.0K
C541
4.7UF
+5V
R430
10.0K
1
2
J344
1780R–SERIES
IA23
PART OF A5 MICROPROCESSOR BOARD
MASTER MPU <16>