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.
Z41 Z42 Z43 Z44
Z45 Z46
Z47
Z48 Z49
Z50
Z51
Z52 Z53
Z54
1 L P H H
P P
P P
H P P
L
H P
2 L
P P P P
P P P P P P
H
H
P
3 H P P
P H H
H H
P P L H L
P
4
L P P P P
P P
P P
*
P
L
H P
5 P
P L
P P P
P
P P
H P
P
P P
6 P P
P P P
P
P P
H
*
P
P P P
7 P
L P
P P
P
P P
H
*
P L L L
8
H
L L L
P
P P
P L P
L
H P H
9 H P P L
L L L
P P
P L P
*
10
H
P P H H H
H
P L P
H P
*
11 L P P
P P
P
P P P P
L L
P
12
H P L
P P
P
P
H P H
P H
P
13 L
P
P L L
L L
H
*
P P H
*
14
H P H
P
P P P P P P
H H H
15 L H P
P
P
P
L L
16
H
H
P
P P P
H H
PIN
IC IC IC IC
IC IC IC
IC
IC IC IC IC IC IC
NO.
Z55 Z56 Z57
Z58 Z59
Z60 Z61 Z62 Z63 Z64 Z65 Z66 Z67 Z68
1 P P
P P
H H P
P P
H P P P
P
2
P
*
P
*
L
L P
P P
P L
P P P
3
P
*
P
*
H P H H H
P L
P
P
P
4
P
*
P
*
P
P P P P P
*
P P
P
5 P H P H P P P
P P
P H P
P
P
6 P
L P L
H P
P P P P
*
P P
P
7
P
L L L L
P
P
P P
P
*
L P P
8 L P P P
L
L
P
P P L P
P L L
9 P P P
P
H
P L L L P P P P P
10
P
L P L
L
P H H H
P
L P P P
11 P P P P H L P
P
P
P P
P
L L
12
P
H P
P
P L P P L P P
P L L
13 P
*
P
*
P L L
L L
P
*
P P P
14
P H
H
P H
L P P P
P P
H P
P
15
L
L L
P
P P L H L
16
H
H
H
P P P
H
H H
26
PIN
IC IC
IC
IC
IC IC
IC
NO. Z69 Z70
zn
Z73
Z74 Z75
Z76
1
p
P
L
H P
P
P
2
P P
P
P
P P
P
3
P
P P
H
P
P P
4
H
H
P
L
P
P P
5
P
P
P
P
P
P P
6 P P
L
P
P P
P
7
L L
L L
L
P
P
8 P P
L
P P
L
L
9
P P
P P
P
P P
10 H
H
P
P H
P P
11
P P
P
H P P P
12 P P
P H
P P
P
13
P
H L
H P
P P
14 H H
L H
H
P
P
15
L
P
P
16
H H
H
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)

Radio Shack CCR-81 Specifications

General

Brand	Radio Shack
Model	CCR-81
Category	Desktop
Language	English