Epson 33+ User's Manual

Epson Computer Hardware User's Manual - 33+.
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Epson EL 4S/33+

EL 4S/33+ Components

Memory -

The following diagrams illustrate the outside of the

EL 4S/33+ system.

 

 

VGA

power inlet

AC outlet

MOUSE

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

ROM

Video RAM

Shadow RAM

Memory

relocation

Internal cache
Math

coprocessor
Clock/calendar

Controllers

Video

Diskette

Hard disk

Interfaces
Monitor

Parallel

Serial

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

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

12/93

Epson EL 4S/33+ - 1

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