Epson EL 4S/33+

EL 4S/33+ Components

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

dskettec#fe reeetbutton

 

KIB/

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cow

VGA

 

 

CoMl

 

power inlet AC outlet

MOUSE

 

PAIGUEL

Computer Specifications

CPU and Memory

32-bit CPU

Cyrix® or Texas Instruments® 486SLC,

 

33 MHz microprocessor with 16-bit data

 

bus
System speed

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
Memory

-

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)
ROM

 

64KB system BIOS and SETUP code

 

 

located in EPROM on main system board;

 

 

32KB video BIOS located in EPROM on

 

 

main system board
Video RAM

 

256KB DRAM on main system board;

 

 

expandable to 512KB or 1024KB using

 

 

70ns or 80ns 44256 DIP chips

Shadow RAM

 

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

 

 

speed; system ROM BIOS and video ROM

 

 

can be copied into RAM

Memory

 

Supports relocation of 256KB of memory

relocation

 

from A0000h to BFFFFh and D0000h to

 

 

EFFFFh to extended memory

Internal cache

 

1KB built into microprocessor
Math

 

Optional Cx83S87-33 coprocessor
coprocessor

 

available
Clock/calendar Real-time clock, calendar, and CMOS

 

 

RAM socketed on main system board with

 

 

built-in battery backup

Controllers

Video

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

Diskette

Controller on main system board supports

 

up to two diskette drives
Hard disk

Interface on main system board supports

 

up to two IDE hard disk drives with

 

built-in controllers; BIOS provides hard

 

disk auto-sensing function
Interfaces
Monitor

VGA interface for analog monitor built

 

into system board; 15-pin, D-shell

 

connector
Parallel

One standard 8-bit parallel, bidirectional

 

interface built into main system board;

 

25-pin, D-shell connector
Serial
Two RS-232C, programmable,

 

asynchronous interfaces built into main

 

system board; 9-pin, D-shell connectors

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Epson EL 4S/33+ - 1