Epson 33+, 4S User Manual

Epson EL 4S/33+

EL 4S/33+ Components

The following diagrams illustrate the outside of the
EL 4S/33+ system.

dskettec#fe

reeetbutton

Memory -

ROM

Video RAM

Shadow RAM

Memory
relocation

Internal cache
Math

coprocessor
Clock/calendar

2MB or 4MB RAM standard on SIMMs;
expandable to 16MB (maximum) using
256KB, 1MB, and 4MB SIMMs; SIMMs
must be 30-pin, 8-bit or 9-bit, fast-page
mode type with access speed of 70ns or
faster (preferably tin-plated)

64KB system BIOS and SETUP code
located in EPROM on main system board;
32KB video BIOS located in EPROM on
main system board

256KB DRAM on main system board;
expandable to 512KB or 1024KB 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

Supports relocation of 256KB of memory
from A0000h to BFFFFh and D0000h to
EFFFFh to extended memory

1KB built into microprocessor
Optional Cx83S87-33 coprocessor

available
Real-time clock, calendar, and CMOS

RAM socketed on main system board with
built-in battery backup

/

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CoMl cow

I

power inlet

AC outlet

KIB

MOUSE

Computer Specifications

CPU and Memory

32-bit CPU

System speed

Cyrix® or Texas Instruments® 486SLC,
33 MHz microprocessor with 16-bit data
bus

Fast and slow speeds available; fast speed
is 33 MHZ, slow speed is 8 MHz; speed
selection through SETUP program and
keyboard commands; zero wait state
memory access at fast speed; 0 or 1 wait
state memory access selectable through
SETUP

I

PAIGUEL

\

VGA

Controllers

Video

-

Diskette

Hard disk

Interfaces

Monitor

Parallel

Serial

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

Interface on main system board supports

up to two IDE hard disk drives with

built-in controllers; BIOS provides hard

disk auto-sensing function

VGA interface for analog monitor built
into system board; 15-pin, D-shell

connector

One standard 8-bit parallel, bidirectional
interface built into main system board;
25-pin, D-shell connector

Two RS-232C, programmable,
asynchronous interfaces built into main
system board; 9-pin, D-shell connectors

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Epson EL 4S/33+

Keyboard

Mouse

Game port

Option slots

Speaker

Mass storage

PS/2 compatible keyboard interface built
into main system board; 6-pin, mini DIN
connector; Num Lock setting selectable
through SETUP

PS/2 compatible mouse interface built
into main system board; 6-pin mini DIN
connector

10-pin game port interface on system
board; can control joy-stick functions with
the addition of an optional game port
connector

Three 16-bit, full-length and two 8-bit,
half-length I/O expansion slots, ISA
compatible, 8 MHz bus speed

Internal
Internal mounts:

Two

3l/frinch

with three or more option cards installed,
the power supply may only support one
internal drive

Externally accessible mounts:
One 3!4-inch wide, third-height drive and
one

S%nch

wide, one-inch high drives;

wide, half-height drive

Setup Program

Stored in ROM accessible by pressing
Ctrl Alt S at the MS-DOS prompt

Physical Characteristics

Width
Depth

Height
Weight

15.6 inches (396 mm)

14.5 inches (368 mm)

4.1 inches (104 mm)
15 lb (6.8 kg), without drives or keyboard

Power Supply

Type

Input ranges

Maximum

outputs

Frequency
Cables

65 Watt, UL listed, fan-cooled
90 to 115,230 to 260 VAC

+5 VDC at 7.5 Amps, -5 VDC at

0.1 Amps, +12 VDC at 2.0 Amps,

-12 VDC at 0.3 Amps
50 to 60Hz
Two to main system board; four to mass

storage devices

Option Slot Power Limits

Diskette drives

Hard disk

drives

Other devices

Keyboard

3.5-inch diskette drive, 720KB or 1.44MB

storage capacity

5.25-inch
storage capacity

3l/cr-inch

to half-height size

Half-height tape drive, CD-ROM drive,
optical drive, or other storage device;

S!&inch or

Detachable, two-position height; 101 or

102 sculpted keys; countrydependent
main typewriter keyboard;
numeric/cursor control keypad; four-key

cursor control keypad; 12 function keys

diskette drive, 360KB

form factor hard disk drive(s), up

3&n&

with mounting frames

or 1.2MB

l

Based on a system containing one hard disk drive and one diskette drive.

Environmental Requirements

Epson EL 4S/33+ - 2

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Major Subassemblies

Epson EL 4S/33+

System Board Components

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Epson EL 4S/33+ - 3