Epson 486 UC+ User Manual

Epson EL 486UC+

EL 486UC+ Specifications

The following diagrams illustrate the outside of the
EL 486UC+ system.

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Computer Specifications

CPU and Memory

32-bit CPU

System speed

Memory

ROM

Intel 486SX/25 microprocessor;
upgradable to 486SX/33, 486DX/33,
486DX2/50, or 486DX2/66

Fast and slow speeds available; fast speed
is 25 MHz or the speed of your upgraded
microprocessor, slow speed is 8 MHz;

speed selection through keyboard
commands or jumper setting

To select slow speed, press Ctrl Alt and-;

to select fasts peed, press Ctrl Alt and+
(use the - or + key on the numeric keypad)

4MB RAM standard on a SIMM;
expandable to 64MB using 1MB, 2MB,
4MB, 8MB, 16MB, and 32MB SIMMs

(64MB maximum requires the use of 32MB

SIMMs; SIMMs must be tin-plated,

72-pin, 32-bit or 36-bit fast-page mode
type with access speed of 70ns or faster

128KB system BIOS, video BIOS, and

SETUP code located in EPROM on main

systemboard

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AC inlet

AC outlet

MOUSE

PARALLEL

Video RAM

Shadow RAM

Memory
relocation

Cache

Math
coprocessor

Clock/calendar

Controllers

Video

512KB DRAM on main system board;
expandable to 1MB using 70ns or 80ns,

256 x 4

Supports shadowing of system and video
BIOS ROM into RAM

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

8KB of internal cache (built into the
microprocessor); supports 64KB, 128KB, or

256KB

8x8, 20ns DIP chips or 28-pin, 32x8,
20ns DlP chips

Math coprocessor built into the
microprocessor for DX and DX2 systems

Contained in the 82C491 system controller
along with 64 bytes of CMOS RAM;
backed up by a soldered NiCad
rechargeable battery

Trident 8900CL VGA controller on main
system board; provides resolutions up to

1024 x 768 in 16 colors (up to 1024 x 768 in

256

bit,

20-pin,

of external cache using 28-pin,

colors with 1MB of video memory)

DIP DRAM chips

12/1/93

Epson EL 486UC+-1

Epson

EL 486UC+

Diskette

Hard disk

Interfaces

Monitor

Parallel

Serial

Keyboard

Mouse

Option slots

Speaker

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 controller; BIOS provides hard
disk auto-sensing function

VGA interface for fixed or multi-frequency
monitor built into system board; 15-pin,
D-shell connector

One standard 8-bit parallel (bi-directional)
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

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

PS/2

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

Three 16-bit, full-length and two 8-bit,
half-length I/O expansion slots, ISA
compatible, 8.33 MHz bus speed

Internal

Keyboard

SETUP

Program

System
security

Physical characteristics
Width 15.6 inches (3% mm)

Depth
Height

Weight

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

Stored in ROM; accessible by pressing
duringboot

User and supervisor level passwords
(8 characters) available for system boot or
diskette access

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 Amp, +12 VDC at 2.0 Amps,

-12 VDC at 0.2 Amps
50/60Hz
Two to main system board; four to mass

storage devices

F2

Mass storage

Diskette drives

Hard disk
drives

Other devices

Internal mounts:
Two

3!4-i.xh

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

Externally accessible mounts:
One

3!44nch

and one

3.~inch

storage capacity

5.~inch diskette drive, 360KB or 1.2MB

storage capacity

3?&nch

to half-height size (on a system with three
or more option cards, the installation of a
second hard disk drive may overload the

power supply)
Half-height tape drive, CD-ROM, optical

drive, or other storage device;

31&.r~h

wide, one-inch high drives;

wide, one-inch high drive

5~4nch wide, half-height drive

diskette drive, 720KB or 1.44MB

form factor hard disk drive(s), up

5!@nch

with mounting frames

or

Option Slot Power Limits

Maximum current

For all slots*

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

+5 Volts

4.6 Amps 0.1 Amp

-5 Volts

+12 Volts

1.1 Amps

-12 Volts

0.1 Amp

Environmental Requirements

Epson EL 486UC+-2

12/1/93

Major Subassemblies

Jumper Settings

J19

Epson

EL 486UC+

J23

System

J25

Miscellaneous jumper settings

J=,Jn,J=,aQ

J37

Epson EL 486UC+-3