321 Studios EPSON Endeavor 486C User Manual

EPSON Endeavor 486C

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

power

button

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

Memory

128KB system BIOS, video BIOS, and

SETUP code located in EPROM on main

system board

ROM

bay for hard disk, diskette drive,

CD-ROM, tape drive, or other

512KB DRAM on main system board,

expandable to 1MB using 256k x 4-bit

DRAM ZIPS

Video RAM

option card slots

Supports shadowing of system and video

BIOS ROM into RAM

Shadow RAM

Cache

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

Math

coprocessor

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

Clock/calendar

Controllers

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

Video

Computer Specifications

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

Controller on main system board supports

up to two diskette drives or one diskette

drive and one tape drive

Diskette

4DX/33C: Intel i486DX, 33 MHz

microprocessor in PGA-type CPU socket;

can be upgraded with optional ODP486-33

OverDrive processor

Interface on main system board supports

up to two IDE hard disk drives with

built-in controllers

Hard disk

4DX2/50C: Intel i486DX2, 50 MHz

microprocessor in PGA-type CPU socket

Interfaces

VGA interface built into main system

board for analog or multifrequency VGA

monitor; 15-pin, D-shell connector

Monitor

System speed

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

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Main System Board Diagram

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Serial Port Connectors (CN9 and CN10)

Major Subassemblies

Serial Port Connector Pin Assignments

Keyboard Connector (CN5) and

Mouse Connector (CN4)

Although the keyboard and mouse connectors are physically

identical, they cannot be used interchangeably.

Connector Pin Assignments

Keyboard and Mouse Connector Pin Assignments

Parallel Port Connector (CN8)

Signal

+5VDC (fused)

clock

Signal

Data

Resewed

Ground

Reserved

VGA Port Connector (CN13)

Parallel Port Connector Pin Assignments

VGA Port Connector Pin Assignments

* Active low logic

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VGA Feature Connector (CN14)

System l/O Address Map

VGA Feature Connector Pin Assignments

*Active low logic

DMA Assignments

Level

Assigned device

Spare (8-bit)

Diskette drive controller (8-bit)

Spare (8-bit)

Cascade for DMA controller

Spare (16-bit)

spare (16-bit)

DMA0

DMA1

DMA2

DMA3

DMA4

DMA5

DMA6

DMA7

spare (16-bit)

Hardware Interrupts

IRQ no.

IRQ0

IRQ1

Function

Timer output

Keyboard

IRQ3

Serial port 2

IRQ4

Serial port 1

IRQ5

IRQ6

IRQ7

Available parallel port 2)

FDD controller

Parallel port 1

IRQ8

IRQ9

I Real-time clock

Available

IRQ10

IRQ11

IRQ12

IRQ13

IRQ14

IRQ15

Available

PS/2 compatible mouse, optional pointing devices

Math coprocessor

HDD controller

Available

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Hard Disk Drive

Settings

System Memory Map

23FFFFF

36MB

lf CS (cable selection) is jumpered, the drive is

and a slave if pin-28 Is not grounded.

master if pin-28 is grounded

DIP Switch Settings

Switch

1**

Setting

OFF

O f f

ON’

O f f

ON’

O f f

Extended memory

33 MHz CPU speed

25 MHz CPU speed

33 MHz CPU speed

CPU present in PGA socket

CPU absent from PGA socket

Enable password security feature

Disable password security feature

Select color monitor

2**

3**

0100000

1MB

System BIOS

(Shadow RAM, 64KB)

Select monochrome monitor

Factory set according to system type

* Factory setting

OOFOOOO

00E0000

00C7FFF

Reserved for system BIOS (64KB)

Reserved for ROM on l/O cards

VGA BIOS ROM (Shadow, 32KB)

VGA Color Text

Processor Chips

The 4SX/25C or 4DX/33C systems can be upgraded with an

Intel OverDrive processor on the main system board to

effectively double the internal clock speed of the computer’s

microprocessor. Alternatively, the 4SX/25C accepts the Intel

487SX/25 microprocessor with built-in math coprocessor.

00B8000

00B0000

00A0000

VGA Mono Text

VGA Graphics

640KB

OverDrive Processors

Base memory

OverDrive processor

ODP486-25

ODP486-33

Jumper and DIP Switch Settings

SIMM Installation

Display Adapter and CPU Jumper Settings

Jumper

Setting

Function

Enable the built-in VGA adapter

Disable the built-in VGA adapter so you can use a

display adapter on an option card as your primary

adapter

The computer comes with 4MB of memory on the main

system board. To increase the amount of memory in the

computer up to 36MB, install 36-bit, fast-page mode SIMMs

that operate at an access speed of 70ns or faster, with a

capacity of 1MB, 4MB, or 16MB.

Select DX or DX2 CPU

Select SX CPU

The following table shows the possible SIMM configurations;

do not install memory in any other configuration.

* Factory setting

Factory set according to system CPU

External Cache Jumper Settings

SIMM Configurations

Factory setting; change jumpers only if external cache chips am Installed

Standard memory on the system board

** SIMMs can occupy either socket

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Video Memory

Hard Disk Drive Types

If the computer has 512KB of video memory, you can install

The table below lists types of hard disk drives supported by

the computer. Check this table and the hard disk manual to

find the correct type number(s) for the hard disk drive(s)

installed in the computer. Enter the type number(s) when you

set the hard disk drive configuration in the SETUP program.

four 256K

4 bit, 70ns, 20-pin DRAM ZIP (Zig-zag Inline

Package) chips to increase the video memory to 1MB. The

following table lists compatible DRAM ZIP chips.

Supported Video ZIP Chips

Hard Disk Drive Types

Cache Memory

Additional cache memory can be installed in eight sockets in

Bank 0 and Bank 1 on the main system board. The figure

below shows how the SRAM are distributed.

8KB or 32KB SRAM chips can be installed. Bank 0 must be

filled before Bank 1. The SRAM type used for RAM in

locations U15 and U16 must match the type installed in the

banks. The table below shows the possible configurations.

Cache Memory Configuration

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Password

Installation/Support Tips

Make sure that you do not forget the password you set up.

If you do:

Mouse and Keyboard

1. Disable it by setting DIP switch 4 on the main system

board to OFF.

When connecting the mouse and keyboard to the

computer, be careful to plug them into the proper ports.

Although the ports are physically identical, they are not

interchangeable, and damage may occur to the main

system board if you plug the connectors into the wrong

2. Then turn the computer on and off again.

3. Set DIP switch 4 to ON to enable the password function.

4. Run SETUP to enter a new password, if desired.

ports.

Installing Diskette Drives

Users can enter a hot key designation in SETUP to secure

the system from unauthorized users. Once a password

and hot key have been set, when the hot key is pressed,

the keyboard and mouse lock until the user enters the

password.

Make sure that the drive type has been correctly selected

in the SETUP program.

Installing Hard Disk Drives

It is recommended that a 16-bit, AT-type hard disk

controller be used if you are installing a drive that cannot

use the embedded IDE interface. If you install a non-IDE

hard disk drive and controller card, you need to use the

SETUP program to disable the built-in IDE hard disk drive

interface.

Booting Sequence

If you cannot boot the computer from the hard disk drive,

make sure the booting sequence in the SETUP program is

set to A, C. Then boot the computer from a system diskette

in drive A.

When installing a hard disk drive, see the hard disk drive

types table on page 7 and use the SETUP program to select

the correct type number for the drive. You can select a

type number that matches the parameters for the drive or

a type number with parameters having lesser values, as

long as they do not exceed the maximum capacity (in MB)

of the drive. If there is no match for the drive, you can

select a user-defined drive type (47) and enter the drive’s

exact parameters.

Information Reference List

Engineering Change Notices

None.

Technical Information Bulletins

None.

Software Problems

Product Support Bulletins

Cl When installing a copy-protected software package, first

try the installation at fast speed. If this does not work

properly, select slow speed by pressing the Ctrl and Alt

keys and the - key on the numeric keypad

None.