Laptop User Manual

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EPSON Equity 4SX/25,4DX/33, and 4DX2/50

power

hard disk

(SPEED) light

access light

diskette

drive

power

button

bay for hard disk, diskette,

tape, CD-ROM, or other drive

11 O/220 VAC switch

option card slots

power keyboard

inlet

port

&al

Serial

port1

port2

VGA

parallel

monitor

mouse

Pofl

poft

Port

Memory

ROM

Video RAM

Shadow RAM

Cache

Math

coprocessor

Clock/calendar

Controllers

Video

Computer Specifications

Diskette

CPU and Memory

32-bit CPU

4SX/25:

Intel

#36SX, 25 MHz

microprocessor; can be replaced with

optional

487SX/25

ODP486-25

OverDriv&”

processor

4DX/33:

Intel

i486DX,

33 MHz

microprocessor; can be replaced with

optional

ODP486-33

OverDrive

processor

System speed

4DX2/50:

Intel

i486DX2,50

MHz

microprocessor

High and low speeds available; high speed

depends on CPU (25

MHZ,

33 MHz, or

50 MHz), low speed is simulated 8 MHz

speed; speed selection through keyboard

command; 0 wait state memory access at

highspeed

Hard disk

Interfaces

Monitor

Parallel

Serial

To select low speed, press the

Ctrl,

Alt,

and

keys simultaneously. To select

high speed, press the

Ctrl,

Alt,

and + keys

simultaneously. (Use the

or + key on the

numeric keypad.)

4MB RAM standard on a SIMM;

expandable using

lMB,

4MB,

or 16MB

SWIMS

to 32MB (maximum); SlMMs must

36-bit,

fast-page mode type with 70ns

(or faster) access speed

128KB system BIOS, video BIOS, and

SETUP code located in EPROM on main

system board

512KB DRAM on main system board,

expandable to

1MB

Supports shadowing of system and video

BIOS ROM into RAM

8KB of internal cache (built into the

microprocessor)

4DX/33

and

4DX2/50

systems, math

coprocessor built into the microprocessor;

optional 487 upgrade available for

4SX/25

system

Real-time clock, calendar, and CMOS

RAM socketed on main system board with

built-in battery backup

Cirrus

VGA controller on main system

board; provides resolutions up to

1024 x 768

Controller on main system board supports

up to two diskette drives or one diskette

drive and one tape drive

Interface on main system board supports

up to two IDE hard disk drives with

built-in controllers

VGA interface built into main system

board for analog or multifrequency VGA

monitor;

15-pin,

D-shell connector

One standard 8-bit parallel, uni- or bi-

directional interface built into main system

board; I/O address selectable through

SETUP; 25-pin, D-shell connector

Two RS-232C, programmable,

asynchronous interfaces built into main

system board; 9-pin, D-shell connectors

4/1/93

EPSON Equity-l

Summary of content (8 pages)

PAGE 1
EPSON Equity 4SX/25,4DX/33, and 4DX2/50 power (SPEED) light hard disk access light diskette drive bay for hard disk, diskette, tape, CD-ROM, or other drive 11 O/220 VAC switch . power keyboard &al inlet port I port1 mouse Pofl option card slots Serial port2 To select low speed, press the Ctrl, Alt, and - keys simultaneously. To select high speed, press the Ctrl, Alt, and + keys simultaneously. (Use the - or + key on the numeric keypad.
PAGE 2
EPSON Equity 4SX/25, 4DX/33, and 4DX2/50 Keyboard PS/2 compatible keyboard interface built into main system board; num lock setting selectable through SETUP; 6-pin, mini DIN connector Mouse Video Modes pode ~GA 640x460 640X460 640x460 connector 600X600 Four 16-bit (or 8-bit) I/O expansion slots, ISA compatible, 8 MHz bus speed; three slots accommodate any size card, bottom slot can hold reduced size card (4.
PAGE 3
EPSON Equity 4SX/25,4DX/33, and 4DX2/50 Main System Board Diagram parallel VGA video serial 2 keyboard mouse serial 1 ELI-d CN3 CN2 QQQ 1 - power supply connectors VGA feature connector ml U18 UlQ standard 512KB video memory option board riser card connector CPU chip < u21 optional 512KB OverDrive socket (ZIF socket) CN 0000000000000000 0000000000000000 1 U,..
PAGE 4
EPSON Equity 4SX/25, 4DX/33, and 4DX2/50 Serial Port Connectors (CN4 and CN5) Major Subassemblies main system option card connector board board (option board riser card) power supply Serial Port Connector Pin Assignments Keyboard Connector (CN3) and Mouse Connector (CN2) pin 6 pin 5 pin 3 pin 4 i ’ SIMM 0 SIMM 1 \ diskette speaker drive pin 2 horizontal drive bays Although the keyboard and mouse connectors are physically identical, they cannot be used interchangeably.
PAGE 5
EPSON Equity 4SX/25,4DX/33, and 4DX2/50 VGA Feature Connector (CN8) System I/O Address Map pin 25 pin 1 ‘Yeeaeeeeoeaaw ,feooooooooooo~, pin 2 ’ ’ pin 26 VGA Feature Connector Pin Assignments IData 8 1 PCLK 9 *Active low logic I17 118 1 ENDATA’ 1 ENSYNC’ DMA Assignments Level DMAO DMAl DMA2 DMA3 DMAS DMAG DMA7 Assigned device Spare @-bit) Spare (&bit) FDD controller (&bit) Spare (&bit) Spare (16~bit) Spare (16~bit) Spare (16~bit) Hardware Interrupts IRQ no.
PAGE 6
EPSON Equity 4SX/25, 4DX/33, and 4DX2/50 If the computer’s microprocessor is a FQFP type, it is surfacemounted on the main system board. To add an OverDrive processor, install it in the empty OverDrive socket and disable the original microprocessor by setting jumper J23 to position 2-3. Also make sure JlO, J11, and J12 are set correctly.
PAGE 7
EPSON Equity 4SX/25, 4DX/33, and 4DX2/50 Hard Disk Drive Types (continued) Video Memory If the computer has 512KB of video memory, you can install four 256K x 4 bit, 7Ons, 20-pin DRAM DIP (Dual InIine Package) chips to increase the video memory to 1MB. The following table lists which DRAM DIP chips you can install on the main system board.
PAGE 8
EPSON Equity 4SX/25, 4DX/33, and 4DX2/50 Installing Hard Disk Drives Ll It is recommended that a X-bit, AT-type hard disk controller be used if you are installing a drive that cannot use the embedded IDE interface. If you install a non-IDE hard disk drive and controller card, you need to use the SETUP program to disable the built-in IDE hard disk drive interface. Information Reference List Engineering Change Notices None.