Epson Endeavor 486C Specifications download pdf

EPSON Endeavor 486C

power

button

Memory

ROM

bay for hard disk, diskette drive,

CD-ROM, tape drive, or other

Video RAM

option card slots

Computer Specifications

Shadow RAM

Cache

Math

coprocessor

Clock/calendar

Controllers

Video

CPU and Memory

32-bit CPU

4SX/25C: Intel i486SX, 25 MHz

microprocessor in PGA-type CPU socket;

can be upgraded with optional 487SX/25

or ODP486-25 OverDrive™ processor

4DX/33C: Intel i486DX, 33 MHz

microprocessor in PGA-type CPU socket;

can be upgraded with optional ODP486-33

OverDrive processor

Diskette

Hard disk

System speed

4DX2/50C: Intel i486DX2, 50 MHz

microprocessor in PGA-type CPU socket

Fast and slow speeds available; fast speed

depends on CPU (25 MHz, 33 MHz, or

50 MHz), slow speed is simulated 8 MHz

speed; speed selection through keyboard

command; 0 wait state memory access at

fast speed

Interfaces

Monitor

7/15/93

EPSON Endeavor 486C-1

To select slow speed, press the Ctrl, Alt,

and - keys simultaneously. To select

fast speed, press the Ctrl, Alt, and + keys

simultaneously. (Use the - or + key on the

numeric keypad.) Default system speed is

also user-selectable through SETUP

4MB RAM standard; expandable using

1MB, 4MB, or 16MB SIMMs to 36MB

(maximum); SIMMs must be 36-bit,

fast-page mode type with 70ns (or faster)

access speed

128KB system BIOS, video BIOS, and

SETUP code located in EPROM on main

system board

512KB DRAM on main system board,

expandable to 1MB using 256k x 4-bit

DRAM ZIP

Supports shadowing of system and video

BIOS ROM into RAM

8KB of internal cache (built into the

microprocessor); expandable to 256KB

using 8KB or 32KB, 70ns SRAM DIP chips

On 4DX/33C and 4DX2/50C systems,

math coprocessor built into the

microprocessor; optional 487 upgrade

available for 4SX/25C system

Real-time clock, calendar, and CMOS

RAM socketed on main system board with

built-in battery backup

Cirrus® Logic GD5422 VGA controller on

main system board; provides true color

resolutions up to 800 x 600 with 512KB

standard memory; with 1MB upgraded

memory, provides resolutions up to

1280x1024

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 controllers

VGA interface built into main system

board for analog or multifrequency VGA

monitor; 15-pin, D-shell connector

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Summary of Contents

Page 1 - EPSON Endeavor 486C

EPSON Endeavor 486CpowerbuttonMemoryROMbay for hard disk, diskette drive,CD-ROM, tape drive, or otherVideo RAMoption card slotsComputer Specifications

Page 2

EPSON Endeavor 486CParallelSerialKeyboardMouseOption slotsSpeakerVGA featureconnectorMass StorageOne standard S-bit parallel, uni- or bi-directional i

Page 3

EPSON Endeavor 486CMain System Board Diagram7/15/93EPSON Endeavor 486C-3

Page 4

EPSON Endeavor 486CMajor SubassembliesSerial Port Connectors (CN9 and CN10)Connector Pin AssignmentsParallel Port Connector (CN8)Serial Port Connector

Page 5

EPSON Endeavor 486CVGA Feature Connector (CN14)System l/O Address MapVGA Feature Connector Pin Assignments*Active low logicDMA AssignmentsLevelAssigne

Page 6 - EPSON Endeavor

EPSON Endeavor 486CSystem Memory MapHard Disk Drive Jumper Settingsllf CS (cable selection) is jumpered, the drive is a master if pin-28 is groundedan

Page 7 - Hard Disk Drive Types

EPSON Endeavor 486CVideo MemoryHard Disk Drive TypesIf the computer has 512KB of video memory, you can installfour 256K x 4 bit, 70ns, 20-pin DRAM ZIP

Page 8

EPSON Endeavor 486CInstallation/Support TipsMouse and Keyboard0 When connecting the mouse and keyboard to thecomputer, be careful to plug them into th