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Tandy PC-6 User Manual
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THEORY
OF
OPERATION
Block
Diagram
KEYBOARD
a
1
"Va6,
d
1
"Vd6
b
1
"Vb6,
e1
"Ve6
c1
"Vc6,
RD"V
R
14
Km1"VKm12
DOT-MATRIX
DISPLAY
5
x
7
dots,
24
digits
a7"Va12,
d7"Vd12
b7"Vb12,
e7"Ve12
c7"Vc12,
RD"VR14
D1-D8,OP,
CE,
C1,
C2
GATE
ARRAY
IC4
MB64H193
RAM
IC3
HM6264ALFP
OPTIONS
26-3671
26-3651
CMT
26-3652
26-3652
NOTE:
Only
one
of
2
options
can
be
connected
at
a
time.
-4-
3
5
Table of Contents
Table of Contents
2
Specifications
3
How to Open Upper Case
3
Theory of Operation
4
Lsi
5
Ram Map
5
Buzzer Control Circuit
6
Interrupt Circuit
6
Keyboard
6
Power Supply
7
LSI (Pin Functions)
8
Display
9
Troubleshooting Guide
10
Test Programs
11
Operation Check
14
Pcb Assembly Views
19
Parts List
20
Electrical Parts
20
Mechanical Parts
21
Exploded View/Disassembly Instructions
23
Schematic Diagram
24
Main Block
24
Keyboard
25
Display
26
4
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Tandy PC-6 Specifications
General
Brand
Tandy
Model
PC-6
Category
Calculator
Language
English
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