Product Information Guide

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Epson EL 4S/33

System speed

hard disk or diskette

drive bay

reset

button

harddisk

‘ght

diskette drive

power

button

access light

monitor cable

Video RAM

option

Card

slots

“AA

Memory

ROM

Shadow RAM

Math

coprocessor

Clock/calendar

Controllers

Video

AC inlet AC outlet

I I

COM1 COM2 Parallel

Game

Diskette

Hard disk

Computer Specifications

CPU and Memory

32-bit CPU

Cyrix Cx486SLC, 33 MHz microprocessor

with 16-bit data bus

Internal cache

1KB built into microprocessor

9/93

Interfaces

Monitor

Parallel

High and low speeds available; high

speed is 33 MHz, low speed is 8 MHz;

speed selection through SETUP program

and keyboard commands; 0 or 1 wait state

memory access selectable through SETUP

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.)

2MB or 4MB RAM standard on SIMMs;

expandable using 256KB, 1MB, or 4MB

SIMMs to 16MB (maximum); SIMMs must

be 30-pin, fast-page mode type with 70ns

(or faster) access speed

Phoenix BIOS A386 V1.03; 64KB system

BIOS, video BIOS, and SETUP code

located in EPROM on main system board

256KB DRAM on main system board,

expandable to 512KB or 1MB using 70ns

or 80ns 44256 DIP chips

32KB or 64KB, 0 or 1 wait state access

speed; system ROM BIOS and video ROM

can be copied into RAM

Socket for Cyrix Cx83S87-33 math

coprocessor

Real-time clock, calendar, and CMOS

RAM socketed on main system board with

built-in battery backup

Trident VGA controller on main system

board; provides standard VGA

resolutions with 256KB memory and

extended VGA resolutions up to

1024 x 768 in 16 colors with 512KB

memory and 256 colors with 1MB memory

Controller on main system board supports

up to two diskette drives, maximum

Interface on main system board supports

up to two IDE hard disk drives,

maximum, with built-in controllers on the

hard disk drive itself

VGA interface built into main system

board for analog or multifrequency VGA

monitor; 15-pin, D-shell connector

One standard B-bit parallel, unidirectional

interface built into main system board;

25-pin, D-shell connector

Epson EL 4S/33-1

Summary of content (8 pages)

PAGE 1
Epson EL 4S/33 System speed hard disk or diskette drive bay 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.) power button reset button Memory 2MB or 4MB RAM standard on SIMMs; expandable using 256KB, 1MB, or 4MB SIMMs to 16MB (maximum); SIMMs must be 30-pin, fast-page mode type with 70ns (or faster) access speed ROM Phoenix BIOS A386 V1.
PAGE 2
Epson EL 4S/33 Serial Game Keyboard Option slots Two RS-232C, programmable, asynchronous interfaces built into main system board; 9-pin, D-shell connectors Power Supply Type 65 Watt, fan cooled One game port interface built into main system board; 15-pin, D-shell connector Input ranges 100 to 240 VAC PS/2 compatible keyboard interface built into main system board; num lock setting selectable through SETUP; 6-pin, mini DIN connector Maximum outputs +5 VDC at 7.5 Amps, +12 VDC at 2.
PAGE 3
Epson EL 4S/33 Serial Port Connectors (CN4 and CN5) Major Subassemblies Serial Port Connector Pin Assignments Keyboard Connector (CON1) pin6 pin 5 pin4-w- pin3 pin 2 pin 1 Keyboard Connector Pin Assignments Pin 1 2 3 Connector Pin Assignments pin 25 Pin 4 5 6 Signal +5 VDC clock Reserved VGA Port Connector (CN2) Parallel Port Connector (CN3) pin 13 Signal Data Reserved Ground pin 1 pin 14 VGA Port Connector Pin Assignments Parallel Port Connector Pin Assignments ‘Active low logic 9/93 E
PAGE 4
Epson EL 4S/33 Game Port Connector (CN1) pin 6 System Memory Map pin 1 000FFFFFFh System BIOS ROM: 64KB Duplicated from 0F0000h pin 15 000FF0000h pin 9 Reserved for system board: 64KB Duplicated from 0E0000h Game Port Connector Pin Assignments 000FE0000h DMA Assignments 16MB [Maximum system Memory) Extended memory 00100000h 1MB System BIOS ROM: 64KB Default Shadow RAM duplicated at FF0000h 000F0000h Hardware Interrupts Unused or I/O expansion ROM: 160KB Resewed for ROM on I/O adapters 000C8000
PAGE 5
Epson EL 4S/33 System l/O Address Map Jumper Settings Port Jumper Settings Jumper number J2 J10 J11 J15*** J27 off* Non-interlaced mode Enables diskette drive controller Disables diskette drive controller 1-2* 2-3 * Factory setting ** DOS automatically reassigns parallel and serial ports. Check your DOS manual for mom information.
PAGE 6
Epson EL 4S/33 Processor Chips Hard Disk Drive Types You can install a Cyrix Cx83S87-33 math coprocessor on the main system board. The table below lists types of hard disk drives you can use in the computer. Check this table and your hard disk manual to find the correct type number(s) for the hard disk drive(s) installed in the computer. You need to enter the type number(s) when you set the hard disk drive configuration in the SETUP program.
PAGE 7
Epson EL 4S/33 Software Problems If the computer has an Epson-supplied hard disk drive, select a user-defined drive type and enter the appropriate information from the table below using the SETUP program. When installing a copy-protected software package, first try the installation at high speed. If this does not work properly, select low speed by pressing the Ctrl and Alt keys and the - key on the numeric keypad simultaneously.
PAGE 8
Epson EL 4S/33 Information Reference List Engineering Change Notices None. Technical Information Bulletins None. Product Support Bulletins None.