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Tandy PC-6 User Manual
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Specs
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Power
Supply
VSSl
VRAM
VlrvV5
VDDl
VDD2
Power
supply
voltage
for
TC4071
BF.
Memory
used
to
keep
the
voltage
for
the
RAM.
LCD
drive
voltages.
Voltage
is
generated
by
connecting
the
external
resistor
to
VDD2.
Power
supply
for
the
CPU,
RAM
and
options.
Stays
VDDl
at
power-on.
Goes
to
GND
at
power-off
or
APO
(auto
power-off).
-7-
6
8
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
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Tandy PC-6 Specifications
General
Brand
Tandy
Model
PC-6
Category
Calculator
Language
English
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