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1.11.
IC51, IC54, IC101, IC201 and IC301 on the Main
Board are using the Analog Multiplexer/Demultiplexer
IC UPD74HC4051G.
Description of this IC is as follows:
IN4 1
IN6 2
COMMON 3
IN7 4
(TOP VIEW)
IN5 5
INHI 6
V
7
EE
Vss 8
Truth Table
INHI C B
A
COMMON
L
L
L
L
L
L
L
H
L
L
H L
L
L
H H
L
H L
L
L
H L
H
L
H H
L
L
H H
H
∗ ∗ ∗
H
NONE
∗
: Don't care.
1.12.
IC815, IC819 and IC919 on the Main Board are using
the Quad 3-State Bus Transceivers IC MC74HC
244AF.
Description of this IC is as follows:
G
1
AB
N.C. 2
1A 3
(TOP VIEW)
2A 4
3A 5
4A 6
GND 7
Truth Table
INPUTS
FUNCTION
G
G
AB
BA
L
L
A
L
H
Not Permit
H
L
A OFF B
H
H
B
16 V
DD
15 IN2
14 IN1
13 IN0
12 IN3
11 A
10 B
9 C
IN0
IN1
IN2
IN3
IN4
IN5
IN6
IN7
14 Vcc
13 G
BA
12 N.C.
11 1B
10 2B
9 3B
8 4B
B
A
1.13.
IC408 to IC410 on the Main Board are using the 12-
Stage Binary Ripple Counter IC MC74HC4040AF.
Description of this IC is as follows:
Q12 1
Q6 2
Q5 3
Q7 4
Q4 5
Q3 6
Q2 7
GND 8
Truth Table
CLOCK RESET Qn OUTPUT
∗
∗
: Don't care.
1.14.
IC401, IC402, IC404, IC405, IC804, IC808 and IC808
on the Main Board are using the Dual 4-ch Analog
Multiplexers/Demultiplexers IC UPD74HC4052G.
Description of this IC is as follows:
YB0 1
YB2 2
ZB 3
YB3 4
YB1 5
E 6
V
7
SS
GND 8
Truth Table
E B A X COMMON Y COMMON
L L L
0X
L L H
1X
L H L
2X
L H H
3X
∗
∗
H
NONE
∗
: Don't care.
24
16 Vcc
15 Q11
14 Q10
13 Q8
(TOP VIEW)
12 Q9
11 RESET
10 CLOCK
9 Q1
H
L
L
Don't Count
Binary Count
L
16 V
DD
15 YA2
14 YA1
13 ZA
(TOP VIEW)
12 YA0
11 YA3
10 SA
9 SB
0Y
1Y
2Y
3Y
NONE
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