KYOTRONIC KC-85 User manual

Table of contents

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SERVICE

MANUAL

KYOTRONIC*

KC-85

PORTABLE

COMPUTER

KYOSE!

CO.,

LTD.

OSAKA

JAPAN

TABLE

OF

CONTENTS

PARTI

INTRODUCTION

.........

:

T-1

EDI

OTe

N

Cha

kT

8

Drea

ESO

(OTN

ACR

TE

eR

OCICS

PRET:

ee

REP

Ee

PREC

Oe

Ea

TE

1-2

External

and

Internal

View

..

13

System

Configuration

.

1-4

Setting

up

PART

II

MAINTENANCE

PROCEDURE

Il-1

Disassembly

Il-2

Reassembly

-

Il-3_

Installation

Procedure

of

Optional

RAMs

and

ROM

Il-4

Troubleshooting

PART

III

THEORY

OF

OPERATION

.......

IlI-1

General

Description

.

.

IlIl-2

CPU

80C85

Ill-3

PIO

81C55

.

Ill-4

UART6402......

MUIASIP

ROTMOEY)

«5,

sip

nice

Sse

Gnvis

ie

serstoreaviavl

levee

Ill-6

Address

Decoding

and

BANK

Selection

IlIl-7_

Memory

Map

Ill-8

I/O

Map

and

I/O

Port

Description

PLD

AU

RUSY

OMIM

vince

ecrs

vis

varias

EUR

AE

Sy

acecplatd’

eve

Ug

erceNOCouaie

sos

Cay

@

HRB

ERT

ee

oo

gana

Te

al

TII-10

Cassette

Interface

.

Ill-11

Printer

Interface

..

IlI-12

Buzzer

Control

Circuit

UEEWES!

SLOT

RRS

<i

Cor

er

ark

3

pas 05e

Sra

bivratelobetutat

ie

IlI-14

Clock

Control

Circuit

MEEESED

«

FUSRe

AO

HOUMCUAEY

at

trun

ingress

og

wove

eViGe

ny

Rink

V0.8

sinc

3d

alm

oh

confuse

oc

ee

ba

eH

Fk

THl-16

LCD

(Liquid

Crystal

Display)

III-17

Power

Supply

and

Reset

Circuit

PART

V

DIAGRAMS...........

V-1

Schematic

Diagram

V-2

PCB

Views

APPENDIX

A-l

Connector

Pin

Assignment

A-2

Keyboard

Layout

A-3

Character

Code

Table

i

INTRODUCTION

I.

INTRODUCTION

In

this

section,

we

will

describe

the

system

over-

view

on

the

KYOTRONIC

85

such

as

external

and

internal

views,

system

configuration

and

set-

ting

up.

I-1

System

Overview

The

KYOTRONIC

85

isa

light-weighted

Portable

Computer

which

has

following

features:

e

Built-in

application

programs.

2-way

power

supply

by

dry

batteries

or

AC

adaptor.

e

80C85

Microprocessor

pin

and

software

com-

patible

with

intel

8085.

e

A-32K

Byte

ROM

which

contains

powerful

BASIC

interpreter.

©

Standard

16K-Byte

RAM

and

can

be

increased

up

to

32K

Bytes

easily.

Peripheral

I/O

Interface

such

as

for

printer,

RS-232C

and

cassette

recorder.

Built-in

Ni-Cd

battery

for

RAM

and

clock

func-

tion

back-up.

e

Auto

power

off

function

for

saving

the

battery

life.

I-1-1

Built-in

Apprication

Programs

BASIC:

The

principal

language

to

operate

the

computer.

TEXT:

This

function

is

a

simple

text

editor

for

creating

and

modifying

text.

TELCOM:

Telecommunication

function.

Terminal

emulation

of

file

up-load

and

down-load

features

through

RS-232C

interface.

[-1-2

2-way

Power

Supply

by

Dry

Battery

or

AC

Adaptor

The

KYOTRONIC

85

can

be

operated

by

4

dry

batteries

(Size

AA,

AM-3)

for

hand

held

carry

or

AC

adaptor

for

office

use.

Life

time

of

battery

operation

is

as

follows:

One

hour

per

day

....---ssee0%

Typical

20

days

Four

hours

per

day

.....-...+++

Typical

5

days

(Without

I/O

interface

at

normal

temperature)

I-1-3

Large

LCD

(Liquid

Crystal

Display)

Screen

The

LCD

has

240

dots

in

x-direction

and

64

dots

in

y-direction.

The

unit

size

of

the

dot

is

0.8

m/m

X

0.8

m/m.

User

is

available

to

change

view

angle

of

LCD

display

by

rotating

contrast

volume.

1-1-4

80C85

Microprocessor

80C85

is

software

compatible

with

8085

but

is

C-MOS

low

power

processor.

1-1-5

ROM

(Read

Only

Memory)

ROM

stores

application

programs

of

the

computer.

It

is

equipped

with

a

32K

ROM.

As

an

optional

feature,

extra

32K

ROM

can

be

installed.

Therefore,

by

doing

this,

capacity

of

ROM

is

ex-

tended

to

64K

and

user

can

use

them

separately

by

dividing

it

into

two

BANKs.

1-1-6

RAM

(Random

Access

Memory)

RAM

stores

BASIC

program

and

data.

Even

if

power

switch

is

turned

off,

the

contents

of

RAM

are

not

erased

because

of

recovery

by

back-

up

battery

equipped

in

the

computer.

The

com-

puter

contains

standard

16K

RAM.

As

an

optional

feature,

extra

RAM

up

to

16K

is

available

for

enhancement

by

installing

them

into

IC

sockets

on

the

MAIN

P.C.B.

Installation

procedure

for

optional

RAMs

is

shown

in

Section

II-3.

I-1-7

Peripheral

I/O

Interface

RS-232C:

Conforms

to

EIA

Standard.

Audio

Cassette

Interface:

Allows

to

use

audio

cassette

recorder

for

saving

or

loading

a

data

or

program.

Printer

Interface:

Conforms

to

Centronics

Inter-

face

Standard.

1-1-8

Built-in

Battery

for

RAM

Back-up

The

rechargeable

Ni-Cd

battery

supports

RAM

for

typical

20

days

(Standard

16K

RAM

installed).

This

battery

also

keeps

the

clock

function

when

the

power

is

off.

1-1-9

Auto

Power

Off

At

the

command-waiting

condition,

DC

power

is

automatically

cut

off

if

there

is

no

key-in

for

10

minutes.

To

re-start

the

operation,

switch

off

the

power

ON/OFF

switch

first,

then

switch

it

on

again.

The

value

of

interval

time

can

be

changed

by

software.

I-2

External

and

Internal

View

LCD

SCREEN

KEYBOARD

TOP

CASE

AC

ADAPTER

JACK

BOTTOM

CASE

CONTRAST

VR

POWER

SWITCH

Figure

I-1

Front

View

RESET

PRINTER

SWITCH

CONNECTOR

RS-232C

CASSETTE

RECORDER

CONNECTOR CONNECTOR

Figure

I-2

Rear

View

RELAY

FOR

CASSETTE

INTERFACE

Ni-Cd

BATTERY

oc/DC

cey

CONVERTER

X'TAL

FOR

SYSTEM

CLOCK

X'TAL

FOR

CLOCK

OPTIONAL

STANDARD

STANDARD

RAM

RAM

ROM

Figure

I-3

Internal

View

(1)

LCD

PCB

(KEY

BOARD)

SUPPORT

(KEY

BOARD)

PCB

Figure

I-4

Internal

View

(2)

I-3

System

Configuration

The

KYOTRONIC

85

can

be

connected

to

following

peripherals.

PRINTER

INTERFACE

CASSETTE

INTERFACE

RS-232C

INTERFACE

CASSETTE

TYPEWRITER

SYSTEM

BUS

INTERFACE

EXTERNAL

I/O

DEVICE

Figure

I-5

System

Configuration

1-4

Setting

up

Install

four

AM-3

type

batteries

or

connect

the

AC

adaptor.

After

installing

the

operational

batteries

or

connecting

AC

adaptor,

turn

on

MEMORY

POWER

Switch

on

the

bottom

case.

If

the

MEMORY

POWER

Switch

is

off,

the

computer

does

not

operate

even

if

the

power

switch

is

on.

Ni-Cd

battery

inside

the

case

is

used

to

protect

RAM.

Then,

turn

on

the

POWER

Switch.

Following

MENU

will

appear

on

the

LCD

display.

Adjust

the

view

angle

by

adjusting

the

CON-

TRAST

volume

so

that

you

can

set

it

at

the

best

position

to

operate

the

computer.

Figure

I-5

Initial

Screen

II.

MAINTENANCE

PROCEDURE

Il.

MAINTENANCE

PROCEDURE

This

section

provides

information

about

regular

maintenance

for

the

KYOTRONIC

85

such

as

II-1_

Disassembly

Upper

and

lower

Case

Removal:

1.

Disconnect

the

cables

from

the

unit.

Taking

care

not

to

scratch

any

key

top,

turn

the

unit

over

and

remove

the

four

screws

4

from

the

upper

and

lower

cases.

Remove

the

upper

case;

it

opens

to

the

right

side.

Please

note

that

the

upper

and

lower

cases

are

secured

by

snaps.

Also,

do

not

apply

too

much

force

when

pulling

open;

the

LCD

and

key-

board

connectors

are

attached.

3.

Remove

the

LCD,

key

board

and

LED

con-

nectors

from

the

MAIN

P.C.B.

i)

LCD

connector

LED

connector

disassembly,

troubleshooting

chart

and

optional

ROM

and

RAM

installation.

K/B

P.C.B.

Removal:

1.

Remove

the

five

screws

8)

and

then

remove

the

K/B

P.C.B.

and

K/B

supports.

LCD

P.C.B.

Removal:

1.

Remove

the

buzzer

connector

from

the

LCD

P.C.B..

2.

Remove

the

four

screws

(

the

LCD

P.C.B.

and

then

remove

MAIN

P.C.B.

Removal:

1.

Remove

the

seven

screws

0).

2,

Remove

the

MAIN

P.C.B.

upward,

taking

care

when

removing

the

RESET

switch

and

battery

contact

spring.

Buzzer

connector

Key

board

connectors

Figure

II-1

Disassembly

II-2

Reassembly

MAIN

P.C.B.

Reassembly:

1.

Align

the

screw

positions

of

the

lower

case

with

the

MAIN

P.C.B.

Gently

insert

the

MAIN

P.C.B.

from

the

rear

and

place

the

reset

switch

knob

in

the

proper

notch.

2.

Secure

the

battery

contact

spring.

3.

Attach

the

MAIN

P.C.B.

to

the

lower

case

by

using

the

seven

M3

X

8

screws.

LCD

P.C.B.

Reassembly:

1.

Attach

the

LCD

P.C.B.

to

the

upper

case

by

using

the

four

M3

X

3

screws.

2.

Insert

the

buzzer

connector

in

the

LCD

P.C.B.

K/B

P.C.B.

Reassembly:

1.

Align

the

two

K/B

supports

with

the

holes

in

the

P.C.B.

and

attach

them

so

that

they

fit

to

the

P.C.B.

edge.

2.

Align

the

K/B

supports

and

K/B

P.C.B.

holes

with

the

upper

case

screws.

3.

Attach

the

K/B

supports

and

K/B

P.C.B.

to

the

upper

case

by

using

the

five

M3

X

8

screws.