+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>