Epson PX-8 Manuale utente

EPSON

.--

TECHNICAL MANUAL

PX-B

H8490021-1

INTRODUCTION

The EPSON PX-8 is a general-purpose

portable

computer

driven

incorporated

rechar-

geable battery. Standard features include a

micro

cassette drive, ROM capsule and

RS-232C

interface

allowing

the

machine

independently

handle a

variety

applications.

The

system

can also be expanded

connecting

peripheral

equipment

such as a printer. Long

time

steady

operation

has been realized

employing

the

battery-powered

supply

system

with

its

large

capacity

1100

mAH.

A recharge

control

circuit

protect

the

battery

from

over-

charge and an auxiliary

battery

(90

mAH)

for

backup have been added

enhance reliability.

MICROCASSETTETM is a trade

mark

OLYMPUS OPTICAL Co., Ltd.

TABLE

CONTENTS

CHAPTER

1 GENERAL DESCRIPTION

CHAPTER

2 PRINCIPLES

OPERATIONS

CHAPTER

3 OPTION (PRINCIPLES

OPERATIONS)

CHAPTER

DISASSEMBLY/ASSEMBLY

CHAPTER

5 TROUBLE

SHOOTING

CHAPTER

MAINTENANCE

CHAPTER

APPENDIX

REV.-A

CHAPTER 1

GENERAL DESCRIPTION

REV.-A

1.1 Specifications............................................................................................................

1-1

1.2

Name

Major

Parts.................................................................................................

1-4

1.3

Major

Parts.................................................................................................................

1-5

1.4

Interface.....................................................................................................................

1-8

1.5

Connection

Cable

(option) ........................................................................................

1-15

REV.-A

1.1 Specifications

(1) Dimension:

(2)

Weight:

(3)

Environment:

• Temperature

•

Humidity

(4) Power:

•

Consumption:

• Battery:

• AC adapter

output:

(5) Keyboard:

(6) LCD:

(7)

Microcassette

TM:

(8) Interface

• RS-232C:

297

(width)

216

(depth) x 4

7mm

(height)

Approx.

2.3 kg

Operating

Recharging

Not

operating

Storing

data

(not

operating)

Operating

Not

operating

35°C

-20

60°C

(below 30°C

for

a long period

time)

40°C

80%

(non-condensing)

85%

(non-condensing)

Approx.

325

(when

micro

cassette, speaker, ROM capsule,

RS-232C, SERIAL are

not

operating)

Two

Ni-cd rechargeable batteries

Main

battery

Auxiliary

battery

Voltage

4.8V 4.8V

Capacity

1100

mAH

90mAH

Charging

current

330

MAX.

Charging

voltage

5.6

6.4V

5.7

6.0V

6.0V,

600

keys (include 9

function

keys)

mode

indication

lamps

480

(width)

(height)

dots

(80

x 8 characters

per

screen)

1/64

duty, adjustable

VIEW

ANGLE

Tape speed

Drive

Track

Frequency

characteristic

Data file

Connector

Voltage

Transmission

speed

Mode

-1

2.4

cm/s

Center capstan

Two-truck,

one-channel

315

4KHz

Sequential file

with

directory

8-pin

mini-DIN

connector

(ON/OFF

control

software)

19200

BPS

Full

duplex/half

duplex

• SERIAL:

• Speaker:

•

Analog

input:

• Bar code:

Connector

Voltage

Transmission speed

REV.-A

8-pin

mini-DIN

connector

(ON/OFF

control

software)

150,

600,4800,

38.4K

BPS

Audio

response

controlled

software

micro

cassette

(with

adjustable volume)

Input

voltage

A/D

converter o

2.0V

6-bit

(Resolution:

approx.0.03V)

Can

connect

high-resolution

(0.19mm)

low-resolution

(0.33mm).

(9)

CPU

and

memory

• Main CPU:

• Slave CPU:

• Auxiliary CPU:

• Main RAM:

• Video RAM:

• ROM:

• ROM capsule:

Z-80,2.45MHz

6303,

614kHz

7508,

200kHz

(with

battery

backup)

64kB

D-RAM

(with

battery

backup)

6kB

static

RAM

(with

battery

backup)

32kB

Two

capsules can be incorporated.

32kB

per capsule)

1.1.1

Available

models

The

following

models are available

for

this

computer. However, major differences

among

these

models are restricted

keyboard and AC

adaptor

specifications, the internal hardware is

the

same.

Table

1-1

Model

Keyboard AC

adaptor

H101AAA

ASCII (U.S.A.) HOOAAA: 1

20V

H101AAC

ASCII HOOAAA: 1

20V

Hz,

HOOAAU-B:

240V

Hz,

HOOAAU-A:

240V

ABA

HASCII (U.S.A.) HOOAAA:

120V

H101AUA

England HOOAAU-A:

240V

H101AFA

France HOOAAF:

220V

H101AGA

Germany HOOAAG:

220V

H101A

Sweden HOOAAG:

220V

H101ADA

Denmark HOOAAG:

220V

H101

ANA

Norway

HOOAAG:

220V

1-2

REV.-A

1.1.2 Specifications

option

Optional features are summarized in

the

table below. They provide you

with

system expansion

meet

your

specific demands

flexible system

configuration

using universal option.

Table

1-2

Name

Application/Descriotion

723

cable For

floppy

disk

drive (serial)

#724

cable For acoustic coupler (RS-232C)

725

cable For

printer

(RS-232C)

#726

cable Null

modem

(for

interconnection

between

two

EPSON PX-8

computers

via RS-232C interfacing)

CX-20/21

Acoustic

coupler

PF-10 3.5 inch

floppy

disk

drive

TF-15/TF-20

5.25

inch

floppy

disk

drive

RAM DISK UNIT

Additional

120/60

kB RAM

UNIVERSAL UNIT A

through-hole

circuit

board and a case

MODEM UNIT Built-in

modem

(for U.S.A. only)

MULTI UNIT RAM + MODEM (for U.S.A. only)

EPSON PRINTER Verious

models

with

RS-232C interface

1-3

REV.-A

1.2

Names

Major

Parts

•

(Front view)

(Bottom

view)

• 9

pi"

••

(Left side view) (Right side view)

(Rear side view)

Fig. 1-1

Table

1-3

Major

Component

No. Name No. Name

VIEW

ANGLE VOLUME (adjustable

view

Power

switch

angle due

temperature

complement)

Speaker

output

(for

external speaker)

Microcassette

(program

load/save and

sound generation)

Analog

input

interface (analog

input/

joystick)

3 LCD panel

unit

Bar code reader interface

4 LCD panel open

switch

5 Keyboard

unit

RS-232C

interface (for

connection

acoustic

coupler/printer,

etc.)

6 Battery

cover

(to replace main battery)

7 ROM

cartridge

cover

(for replacement

ROM capsule, and INITIAL RESET)

8 Reset

switch

High-speed serial interface (for

connec-

tion

floppy

disk

drive)

Expansion interface (for

connection

optional

unit/universal

unit)

9 Speaker

volume

(internal/external

speaker

volume

adjustment)

1-4

REV.-A

1.3

Major

parts

The main

unit

consists

five

parts

and a case as

shown

in Fig. 1-2.

MAPLE board

control

board realizing

compact

size and

low

power

consumption

with

CMOS,

flat

package

type

multifunction

gate arrays and various chips on it.

Micro

cassette

Consists

control

board and

driving

mechanism. Reads and

writes

data

from

and

the

tape.

Q) Keyboard

Has

keys

(73

keys

for

Japanese use), 9

which

are

function

keys.

Also

has three in-

dicators

which

show

the

input

mode.

LCD

Consists

480

(width)

(height) dots, can display a

total

480

characters.

Main

battery

A rechargeable Ni-cd

battery

with

capacity

1100

mAH.

supplies

power

necessary

for

the

normal

circuit

operation.

Bottom

side

Fig.

1-2

1.3.1

MAPLEboard

Power

consumption

is considerably reduced

employing

power-saving

C-MOS. On-board inte-

gration

has

become

easy

employing

customized

LSls and chips.

Although

both

sides

the

boards are utilized,

the

back side

mainly

includes chips such as resistors and capacitors.

~-ROM

capsule Internal speaker

Front

view

Rear

view

Fig.

1-3

1-5

REV.-A

External interfaces

(shown

in Table

1-4)

and

two

ROM capsules on

the

board

provide

system

configuration

suitable

for

your

needs

implementation

application

program.

auxiliary

rechargeable

battery

mAH

is also

incorporated

which

supplies

power

order

ensure

normal

circuit

operation

when

the

voltage

the

main

battery

falls

down

below

a certain value.

Table

1-4

External

Interfaces

Item Function

Note

RS-232C

19200

BPS, Operator-selectable:

transmission

speed,

RS-232C

level X-ON/OFF, etc.,

SERIAL

38400

BPS

MAX., Operator-selectable:

transmission

speed,

RS-232C level X-ON/OFF, etc.,

Barcode

Read

TTL

level Read

program

and bar code reader are required.

Analog

input

Analog

joystick

input

Analog

input

line has

+5V

pull up

function.

(with

trigger)

External speaker o

6Voutput

8.0

0.2W

1.3.2

Microcassette

The

microcassette

consists

control

board and

drive

mechanism.

Operations

such as

FF,

REW, etc. are

controlled

software,

resulting in high reliability compared

with

manual control.

Increased chip

implimentation

has

permitted

a reduction in size

the

control

board.

This

cassette

drive

operates

a tape speed

2.4

cm/s,

and reads

writes

data

effectively

utiliz-

ing a tape

counter

and

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