EPSON Endeavor 486C

power

button

bay for hard disk, diskette drive, CD-ROM, tape drive, or other

option card slots

Computer Specifications

CPU and Memory

 

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

Memory

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

ROM

128KB system BIOS, video BIOS, and

 

SETUP code located in EPROM on main

 

system board

Video RAM

512KB DRAM on main system board,

 

expandable to 1MB using 256k x 4-bit

 

DRAM ZIPS

Shadow RAM

Supports shadowing of system and video

 

BIOS ROM into RAM

Cache

8KB of internal cache (built into the

 

microprocessor); expandable to 256KB

 

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

Math

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

coprocessor

math coprocessor built into the

 

microprocessor; optional 487 upgrade

 

available for 4SX/25C system

Clock/calendar

Real-time clock, calendar, and CMOS

 

RAM socketed on main system board with

 

built-in battery backup

Controllers

Video

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

32-bit CPU

System speed

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

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

 

memory, provides resolutions up to

 

1280x1024

Diskette

Controller on main system board supports

 

up to two diskette drives or one diskette

 

drive and one tape drive

Hard disk

Interface on main system board supports

 

up to two IDE hard disk drives with

 

built-in controllers

Interfaces

Monitor

VGA interface built into main system

 

board for analog or multifrequency VGA

 

monitor; 15-pin, D-shell connector

7/15/93
EPSON Endeavor 486C-1