Radio Shack CCR-81 Technical Service Data

LOGIC CHART (Continued)
PIN IC IC
IC IC IC IC IC IC IC IC IC IC
IC
IC
NO.
Z14
Z15
Z16 Z17 Z18 Z19
Z20 Z21 Z22 Z23 Z24 Z25 Z26 Z27
1 P
P P P P
P P
P P P P
L P
H
2
P
P P
P
P P
P
P
H H P L
P
H
3 P P
P P
P
P P P
H H
P
L
P
L
4 P P
P P
P
P P P P P L
H L H
5 P P P
P
P P P
H P
P
L
H
P P
6 P P P P P P P H P P H H H P
7
P P P P P
P
P H P L L L L
P
8 H
H
H H H
H
H L L H
L
H P L
9 H H
H
H
H
H
H
P
H
P H H P
P
10 P P P P P
P P
P
H H
H
H H P
11
P P P P P
P P P
P
P
H
L P P
12
P
P P P P
P P P
P P
L L P
P
13 P P
P P
P P P
P P
P
H
L P P
14 P P P
P
P P P P
P
H H
H
H P
15
P
P
P P
P P
P P L P
16 L L L
L L L L
H
H
H
PIN IC IC IC IC IC IC IC IC IC IC
PIN
IC
PIN IC
NO.
Z28 Z29 Z30
Z31 Z32
Z35
Z36 Z37
Z38 Z39
NO.
Z40 NO Z40
1 H P P
H P P P H L L 1 P 21
P
2 P P L P
P P
H
L L
P
2
P
22 P
3 P P P
P P P
H L L
P
3 P
23 H
4
P P H
P
*
P
P P P P
4 P 24 H
5
P
P
L P H P P P P P 5 L 25
H
6 P
P
L
P
*
P P P P
P
6 P 26 H
7
~ P
L P
*
P
L L P P 7 P 27
P
8 L
P
P
L
P
L H
P
L L 8
P
28
P
9
P
L
P P P P H P L
P
9
P
29
L
10
P P
P P
L P
P
L L P
10 P 30 P
11
P
P
L
P
P
P P L P
P
11 H
31 P
12 P P P P
P P P
L
P P
12 P 32
P
13 P P P
P
*
P L H
P P 13 P
33 P
14
P P H
P P
P
H H
P P 14
P
34
P
15
P
P
L
L
L L 15 P 35
P
16 H
P H H H H 16 L 36
P
17 L
17 H
37 P
18 H 18
H
38
P
19
P
39
P
20 H 40 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)
:::D
~»
0
52
cO
mC/)
1:1:
-»
10
m"
<~
~:::D
_C/)
-0,
o
25

Radio Shack CCR-81 Specifications

General

Brand	Radio Shack
Model	CCR-81
Category	Desktop
Language	English