Radio Shack CCR-81 Technical Service Data

24
LOGIC CHART
PIN
IC IC
PIN
IC PIN IC
PIN
IC
IC IC PIN IC PIN IC
NO.
Zl ZlA
NO.
Z18
NO.
Z18 NO.
ZlC Z2
Z2A
NO.
Z28
NO.
Z2B
1
(ll
P 1
P 13 P
1
L
(1)
P 1
P 13 P
2
L 2 P 14
P 2
L L
2 P 14 P
3
P
3
P 15 P
3 L
P 3 P 15
P
4 L 4
P 16 P
4 L L
4 P 16 P
5
P
5 P 17 P
5
L P
5 P 17 P
6
L 6
P 18 P
6 L L 6
P 18 P
7
L 7
P 19
L 7
L L 7
P
19 L
8
L
8 P 20
P
8
L L 8
P 20 H
9
P 9 P
21 P
9
L P 9 P 21
H
10
L 10 P 22 P
10
P L
10 P 22
P
11 P
11 P
23 P
11 H
P
11 P
23 P
12
L
12
L 24
H 12
L L 12 L 24 H
13
P
13
L
P
14 H
14 L H
15
L
16
H
PIN
IC IC IC IC IC
IC IC
IC IC IC
IC IC IC
IC
NO.
Z2C Z3A Z3B Z4 Z4A
Z5 Z6 Z7 Z8 Z9 Z10 Zll Z12 Z13
1
H P
P
L P
P P H L L L L P P
2 L H
H
L H
P
P L P H L L P P
3 L
P
H
L P P P
P
P P L L
P
P
4
H H H
P
H
P
P H P
P P P
P P
5 L P
H P P P
P L
P L P P
H
P
6 L H H L H
P
P H P H L L
P
P
7 L
P H
L P L
L L
P
L P
P
P
P
8 L
L L L L
P
P H L
P L
L P H
9 L P
H
P
P
P P
H P P H H P H
10 H
H
P
H
H
P
P L
P
H P P L P
11
L P P
L P P P
L P L P P P
P
12 H P
P L
P P P
L P H
P
P
P
P
13 L P L L
P P P
L P L P L P
P
14 H P L
H
P H
H H
P H
L P P P
15
P P P
L P H P
16
H H H .H
H H
L
Logic probe readings taken with computer turned On, no
keys pressed, unless otherwise noted.
Logic Probe Display
L=Low
H = High
p= Pulse
* = Open (No light On)
(1) Logic readings not taken

Radio Shack CCR-81 Specifications

General

Brand	Radio Shack
Model	CCR-81
Category	Desktop
Language	English