Epson Equity LT Product information

Brand: Epson

Model: Equity LT

Type: Product information

EQUITY LT

Switch Settings

Computer Specifications

The CPU SPEED switch selects between 4.77 MHz and 10

MHz. When the computer is running at 4.77 MHz, the power

light is orange, and at 10 MHz, the light is green.

CPU:

NEC V30 dual-speed

m1croprocess0r.

4.77 or 10 MHz

Switch

selectable

clock

speeds.

20-b,,

address bus and

16.blf data bus

640KB on

man

system board

16KB.

two sockets

RAM:

ROM:

Floppy Disk

Controller:

The CPU SPEED switch is located above the keyboard.

Supports

two

tnfernal

(720KB)

dwes

and one external 5 25”

(360KB)

drive

Two

expansron

slots

(proprietary)

Internal. programmable

64 Bytes

CMOS RAM

lor

real-llme

clock. calendar, and system

cont,gurat,on

w,th

battery backup

P,op,,e,ary,

full-functmn.

keys,

separate

numer~clcursor

pad

N,Cad rechargeable battery and

siandard 1101220 AC adaptor

Expansion Slots:

Speaker:

Clock/Calendar

RAM:

Num

Lock

Keyboard:

Power:

Video Controller

and Screen:

Superlwf

or super,wsl

backlit

LCD,

external CGA

momtor

port

opflonal

Mass storage:

Standard:

Two. 3.5 half-height floppy

disk

dwes. 720KB storage

capacity

35-

half-helgh,

floppy

disk

dwe

and

20MB hard

disk

drive

Centronlcs’-compatible parallel port

RS-232C

compattble

serial

port

5 25 floppy

disk

dwe

port

Exlernal

CGA

port

LCD DIP Switch Settings

Standard:

Switches

Functions

Interfaces:

Standard:

1 2 3 4

OFF

ON ON

ON OFF

OFF ON

OFF OFF

OFF

Environmental

Conditions:

Temperature

LCD Normal

LCD Reverse

LCD Screen Mode 0

LCD Screen Mode 1

LCD Screen Mode 2

LCD Screen Mode 3

Select LCD

Select RGB color monitor

Operating

Range

41~

90°F

(50

35%)

Storage Range

-4O

12Z°F

(-20”

6OOC)

Operating Range 20%

60%

non-condensing

storage Range 10%

90%

non-condensmg

Humidity:

Physical

Dimensions: Wldlh

-13 6

I”

Depth -12 2

I”

Height-

I”

Waghi-

12 6 Ibs

(Dual floppy

disk

drive

conhguratlon)

Display Options: Supertwist

Backlit LCD

Screen Type:

Rellectlve Transmlsslve

LCD Color:

YdOW

Blue

Size (Active Area):

95’

x 41

Aspect Ratio:

14to1 14101

Graphrcs

Resolution: 640

200 640

200

80 x 25

Character

Drsplav:

S&&able

View

Anglellnverse

Video:

Y=?S

Yes

Adjustable

Brightness:

Power Saver

Feature:

Yes

Equity LT Options:

Internal 30011200 baud modem

13 CGAcolordlsplay(640 x

200dots)

carrying case

Cigarette

lighter

adaptor

Screen

d,splays

Supertwsl LCD

dnsplay

Supertwsl

Backltt

LCD

display

Equity Series Computers

EQLT - 1

12/12/88

EQUITY LT

Back Panel DIP Switch Settings

Switches

Functions

12 3 4

Use external diskette drive

3FF

Use parallel printer

External diskette drive is B

OFF

External diskette drive is A

1 FDD

OFF

FDDs

Serial port is secondary

OFF

Serial port is primary

System Board Jumper Adjustment

Jumper 5 is used to control the LED showing drive access

for the left-hand drive.

In position A, it supports a FDD.

In position B, it supports a HDD.

Connector Pin Assignments

Parallel Port Connector

000000000000cJ

oooooooooooc

PIN NO. SIGNAL NAME DIRECTION

-STROBE 0

DATA0

DATA1

DATA2 0

DATA3

DATA4

DATA5

DATA6 0

DATA7

-ACK

BUSY

ZCT

-AUTOFD

-ERROR

-1NIT

-SLCTIN

18-25 GND

DESCRIPTION

Strobe

Printer

Data

Printer Data 1

Printer Data

Printer

Data

Printer

Data

Printer

Data

Acknowledge

Printer Busy

Paper End

Printer Select

Auto Feed

Printer Error

Printer Initialize

Printer Select

Ground

Serial Port Connector

PIN NO. SIGNAL NAME DIRECTION

DESCRIPTION

CRDET

Data Carrier Detect

RXDT

Receive Data

TXDT

Transmit Data

DTR

Data Terminal Ready

Signal Ground

DSR

Data Set Ready

RTS

Request to send

CTS

Clear to Send

Ring Indicator

Monitor Connector

PIN NO. SIGNAL NAME DIRECTION

DESCRIPTION

ROUT

GOUT

BOUT

IOUT

HSYNC

VSYNC

Frame Ground

Ground

Video Signal (Red)

Video Signal (Green)

Video Signal (Blue)

Video Signal (Intensity)

No connection

Horizontal Sync.

Vertical Sync.

EQLT - 2

12/12/88

Equity Series Computers

EQUITY LT

I/O Port Addresses

Address

Function

000-OlF

DMA Controller

020

03F

Interrupt Controller

040

-05F

Timer

Counter

080

07F

Programmable Peripheral Interface

080

09F

DMA Page Register

OAO

Non

Maskable Interrupt Mask

2F8-2FF

Serial Port 2

320

32F

Hard Disk Controller

3BC

3BF

Parallel Port

3D0

3DF

Video (LCD/CRT) Controller

3FO-3W

Floppy Disk Controller

3F8

-3FF Serial Port 1

03DA

Gradation Selection

1184-1185

RTC and CMOS RAM

1188

System Status Register

DMA Channels

Channel

Function

DRAM Refresh

Spare

FDD Controller

HDD Controller

Hardware Interrupts

NUMBER FUNCTION

IRQO

IRQl

IRQ2

IRQ3

IRQ4

IRQ5

IRQ8

IRQ7

Timer Output

Keyboard

Reserved

Serial Port 2

Serial Port 1

Hard Disk

Floppy Disk

Printer

Equity Series Computers

12/12/88

EQLT-3

EQUITY LT

lnstallation/Support Tips

Power

---

The Equity LT AC adapter is an auto -sensing unit

which adjusts automatically between 100-240 V,

50/60 Hz. Therefore, it can be used anywhere in

the world without special adjustment.

---

When using the Equity LT, equipped with the HDD

and backlit LCD, on battery power, take

conservation measures. These are: 1) set the

backlight period option to 30 seconds, 2) set the

brightness and contrast controls as low as is

comfortable, 3) run at 4.77 MHz and 4) turn the

HDD off, at the power switch in the rear of the

drive, when the HDD is not actually in use.

---

Periodically, discharge the battery completely. This

will help to minimize the memory effect encountered

with NiCad batteries. After the complete discharge,

give the LT a full, 12-hour recharge. This will

help to keep battery charge life as great as

possible.

Video

---

When using the Equity LT with a color monitor, as

opposed to an LCD, make sure that LCD DIP switch

number 4 is set OFF. If the unit is connected to

both LCD and monitor, the display can be switched

back and forth without rebooting.

---

If you find the display, generated by your software

package, is difficult to read, adjust LCD DIP

switches 2 and 3 to find the clearest LCD Mode.

There are four options and one of them should

improve the display.

---

If your software requires that you specify a display

type, select CGA. If it is an option, select CGA -

ONE COLOR. Some software packages have a

display type called BLACK & WHITE for Laptops. If

this is an available option, select it.

EQLT - 4

12/12/88

Software Problems

---

When installing a copy- protected software package

on the Equity LT, set the the CPU speed to 4.77

MHz. This has been found to have fewer conflicts

with copy-protection. After the installation, the

CPU can be switched back to the higher speed.

---

If a software package does not appear to be

compatible with the Equity LT, try switching the

CPU speed to 4.77 MHz before giving up. Some

software packages (e.g., PC-Talk Ill from Headlands

Communications Corp.) have been found to function

only at 4.77 MHz.

Equity Series Computers

EQUITY LT

Information Reference List

Engineering Change Notices

EQLT-001

EQLT-002

EQLT-003

12/8/87

2/10/89

Change of Cable Set Y6DE

(PDD

Signal Cable)

Hilo-HDC Snort Potential

Equity LT/LT Modem Insulating Sheet

Product Support Bulletins

50031

12/14/87

w5/~

6/14/M

W89

Epson Equity LT Product information

Epson Equity LT Product information

Epson Equity LT Product information

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