RadiSys EPC-31 Application guide

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1

Table of contents

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EPC-31/32

Hardware

Reference

RadiSys

Corporation

15025

S.W.

Koll

Parkway

Beaverton

OR

97006

(503)

646-1800

FAX:

(503)

646-1850

EPC

and

RadiSys

are

registered

trademarks

of

RadiSys

Corporation.

OS/2,

IBM,

and

PC/AT

are

trademarks

of

International

Business

Machines

Corporation.

Microsoft

Windows

and

MS-DOS

are

registered

trademarks

of

Microsoft

Corporation.

Intel

and

Intel486

SL

are

trademarks

of

Intel

Corporation.

April

1994

Copyright

©

1994,

1995

by

RadiSys

Corporation

All

rights

reserved.

Hardware

Warranty

RadiSys

Corporation

("RadiSys")

warrants

the

EPC

system

and

component

modules

to

the

original

purchaser

for

two

years

from

the

product's

shipping

date.

If

an

EPC

product

fails

to

operate

in

compliance

with

its

specification

during

this

period,

RadiSys

will,

at

its

option,

repair

or

replace

the

product

at

no

charge.

The

customer

is,

however,

responsible

for

shipping

the

product;

RadiSys

assumes

no

responsibility

for

the

product

until

it

is

received.

This

warranty

does

not

cover

repair

of

products

that

have

been

damaged

by

abuse,

accident,

disaster,

misuse,

or

incorrect

installation.

RadiSys'

limited

warranty

covers

products

only

as

delivered.

User

modification,

such

as

the

addition

of

memory

airays

or

other

devices,

may

void

the

warranty,

and

if

the

product

is

damaged

during

installation

of

the

modifications,

this

warranty

does

not

cover

repair

or

replacement.

This

warranty

in

no

way

warrants

suitability

of

the

product

for

any

specific

application.

JN

NO

EVENT

WILL

RADISYS

BE

LIABLE

FOR

ANY

DAMAGES,

INCLUDING

LOST

PROFITS,

LOST

SAVINGS,

OR

OTHER

INCIDENTAL

OR

CONSEQUENTIAL

DAMAGES

ARISING

OUT

OF

THE

USE

OR

INABILITY

TO

USE

THE

PRODUCT

EVEN

IF

RADISYS

HAS

BEEN

ADVISED

OF

THE

POSSIBILITY

OF

SUCH

DAMAGES,

OR

FOR

ANY

CLAIM

BY

ANY

PARTY

OTHER

THAN

THE

PURCHASER.

THE

ABOVE

WARRANTY

IS

IN

LIEU

OF

ANY

AND

ALL

OTHER

WARRANTIES,

EXPRESSED

OR

IMPLIED

OR

STATUTORY,

INCLUDING

THE

WARRANTIES

OF

MERCHANTABILITY,

FITNESS

FOR

A

PARTICULAR

PURPOSE

OR

USE,

TITLE

AND

NON-INFRINGEMENT.

Repair

or

replacement

as

provided

above

shall

be

the

Purchaser's

sole

and

exclusive

remedy

and

RadiSys'

exclusive

liability

for

any

breach

of

warranty.

NOTES

Table

of

Contents

1.

Product

Description

1

Specifications

2

2.

Installation

and

Configuration

3

Installation

3

Power-On

Screen

Display

4

BIOS

Setup

Screen

5

Date

and

Time

6

Configuration

Errors

7

Diskette

Drive

7

Fixed

Disk

Drive

7

Cache

7

Quick

Boot

7

Update

BIOS

8

COM1/COM2

8

LPT1

8

Floppy

8

IDE

8

Fixed

Disk

Menu

8

User-Definable

Drive

Types

9

Theory

of

Operation

11

Processor

and

Coprocessor

12

Memory

13

Memory

Expansion

13

ROM

and

ROM

Shadowing

14

Battery

14

Speaker

15

Miscellaneous

Connector

16

Resetting

the

EPC

17

Watchdog

timer

18

Power

and

Cooling

Requirements

19

Cooling

19

Fuse

19

SVGA

Video

Controller

20

Flat

Panel

Support

20

Flash

Disk

Subsystem

21

EPC-31/32

Utilities

Diskette

Contents

22

Onboard

Flash

Utility

Installation

22

Formatting

Program

22

XFORMAT

Error

Messages

26

Flash

BIOS

Updating

28

Peripheral

Interfaces

31

ISA

bus

32

Connectors

35

Overview

35

IDE

Hard

Disk

Drive

Controller

36

Floppy

Disk

Drive

Controller

37

COM2/LPT1

Connector

38

Miscellaneous

Connector

39

Flat

Panel

Display

Connector

40

Power

Connector

41

AT/ISA

Bus

Connector

Pin-out

42

SVGA

Connector

44

Serial

&

Parallel

Ports

45

Keyboard

45

Troubleshooting

&

Error

Messages

47

Troubleshooting

47

Common

Error

Messages

48

Upgrades

55

Memory

55

Support

and

Service

57

In

North

America

57

Technical

Support

57

Bulletin

Board

57

Repair

Services

58

Warranty

Repairs

58

Non-Warranty

Services

58

Arranging

Service

59

Other

Countries

60

Appendix

A:

Mechanical

Dimensions

61

Appendix

B:

Chip

Set

and

I/O

Map

63

Memory

Map

63

I/O

Address

Maps

64

Appendix

C:

AT

Bus

Connector

Signals

75

AT

Bus

Expansion

Connector

Signals

75

Appendix

D:

Video

Modes

and

Supported

Panels

81

Index

14

Figures

Figure

1.

POST

Display

5

Figure

2.

Main

Setup

Screen

6

Figure

3.

Fixed

Disk

Menu

Screen

9

Figure

4.

Replacing

the

Battery

14

Figure

5.

EPC-31/32

Mechanical

Dimensions

61

Figure

6

.

Mounting

Hole

Dimensions

62

Tables

Table

1.

EPC-31/32

Environmental

and

Electrical

Specifications

2

Table

2.

Fixed

Disk

Conversion

Values

10

Table

3.

SIMM

Organization

13

Table

4.

EPC-31/32

Terminations

33

Table

5.

IDE

Hard

Disk

Drive

Connector

Pin-out

36

Table

6

.

Floppy

Disk

Drive

Pin-out

37

Table

7.

COM2/LPT1

Pin-out

38

Table

8

.

Miscellaneous

Connector

Pin-out

39

Table

9.

Flat

Panel

Display

Connector

Pin-out

40

Table

10.

Power

Connector

Pin-out

41

Table

11.

AT/ISA

Bus

Connector

Pin-out

42

Table

12.

AT

Bus

Pin-out

43

Table

13.

SVGA

Connector

Pin-out

44

Table

14.

DB-9

Pin-out

45

Table

15.

Keyboard

Connector

Pin-out

45

Table

16.

Memory

Map

63

Table

17.

First

(

8

-bit)

DMA

Controller

Map

64

Table

18.

First

Interrupt

Controller

Map

65

Table

19.

Counter-Timer

Functions

Map

65

Table

20.

Keyboard

Port

Map

65

Table

21.

Time-of-Day

Clock

Map

66

Table

22.

DMA

Page

Registers

Map

67

Table

23.

Miscellaneous

Map

67

Table

24.

Second

Interrupt

Controller

Map

67

Table

25.

Second

(16-bit)

DMA

Controller

Map

68

Table

26.

VL82C486

Controller

Map

68

Table

27.

Coprocessor

Interface

Map

69

Table

28.

VL82C486

Controller

Map

69

Table

29.

COM2

Serial

I/O

Port

Map

70

Table

30.

Parallel

I/O

(LPTl)

Port

Map

70

Table

31.

Super

VGA

Controller

Map

72

Table

32.

COM1

Port

Map

73

Table

3

3.

Floppy

Disk

Drive

Controller

Map

73

Table

34.

IDE

Hard

Disk

Drive

Controller

Map

74

Table

35.

Flash

Disk

Subsystem

Map

74

Table

36.

Watchdog

Timer

Map

74

1.

Product

Description

The

EPC-31/32

are

PC/AT

compatible

single

board

computers.

The

EPC-31

uses

the

25

MHz

Intel486

SX

processor,

and

the

EPC-32

uses

the

33

MHz

Intel486

DX

processor.

Where

practical,

this

manual

refers

to

the

EPC-31/32

when

discussing

characteristics

similar

to

both

modules.

The

EPC-31/32

has

been

designed

to

meet

stringent

safety

and

low

EMI

standards

(UL-1950).

All

mounting

bracket

ports

have

filter

networks

for

reduced

EMI

and

increased

ESD

protection

A

Many

of

the

connectors

on

the

EPC-31/32

provide

power

through

different

pins.

Connecting

the

wrong

cable

or

reversing

the

cable

can

damage

the

EPC-31/32

and

may

damage

the

device

being

connected.

Use

extreme

caution

when

preparing

to

connect

cables

to

this

product.

Refer

to

the

diagram

in

Appendix

A

for

complete

connector

labeling.

The

EPC-31/32

processor

module

contains

the

following:

A

25

MHz

Intel486

SX

or

33

MHz

Intel486

DX

processor

Options

for

0

and

1

MBytes

of

on-board

base

memory

One

72-pin

SIMM

socket

providing

up

to

16

MBytes

of

DRAM

Full

ISA

bus

compatibility,

including

DMA

and

interrupt

controllers

2

RS-232

COM

ports

—

one

9-pin

connector

and

one

header

connector

LPT1

parallel

port

available

through

a

header

connector

PC-compatible

floppy

drive

controller

accessed

through

a

header

connector

IDE

hard

drive

interface

for

2.5"

drives,

using

a

44-pin

header

PC/PS-2

keyboard

interface

via

a

6-pin

mini-DIN

connector

Time-of-day

clock

with

user-replaceable

battery

Field-upgradable

Award

BIOS

in

flash

memory

Watchdog

timer

Optional:

Super

VGA

controller/flat

panel

display

controller,

with

512

Kbytes

memory

1

or

2

MBytes

on-board

Flash

memory

configurable

as

a

DOS

bootable

disk

Specifications

The

following

table

lists

the

environmental

and

electrical

specifications

of

the

EPC-31/32.

Environmental

Temperature

storage

Humidity

storage

0

-

60°C

derated

2°C

per

1000

ft

(300

m)

over

6600

ft

(2000m)

operating

-40

to

85°C

operating

5

-

95%

(non

condensing)

5

-

95%

(non

condensing)

Altitude

operating

0

-

10,000

ft

(3000

m)

storage

0

-

40,000

ft

(12,000

m)

Vibration

operating

2.5

g

acceleration

over

5-300

Hz

sine

wave

(P-P),

1

oct/min

sine

sweep

storage

5

g

acceleration

over

5-300

Hz

sine

wave

(P-P),

1

oct/min

sine

sweep

Shock

operating

30

g,

11

ms

duration,

half-sine

shock

pulse

storage

50

g,

11

ms

duration,

half-sine

shock

pulse

Electrical

Current

typical

+5V

@

1

0A

486SX

25MHz

+5V

@

1.1A

486DX

33MHz

+12V

@

50mA

for

writing

to

flash

BIOS

or

on-board

flash

memory

Table

1.

EPC-31/32

Environmental

and

Electrical

Specifications.

*

Upper

temperature

limit

degrades

2

C

per

1,000

ft.

elevation.

Maximum

elevation

10,000

ft.

Vibration

and

shock

specifications

assume

the

EPC-31/32

is

mounted

as

a

single

board

computer,

and

is

not

installed

in

a

standard

ISA

chassis.

The

EPC-31/32

is

capable

of

driving

a

four-slot

ISA

backplane.

See

Appendix

A

for

mechanical

dimensions.

22.

Installation

and

Configuration

Before

installing

the

EPC-31/32,

unpack

and

inspect

it

for

shipping

damage.

do

not

remove

the

module

from

its

anti-static

bag

unless

you

are

in

a

static-free

environment,

the

epc-31/32,

like

most

other

electronic

devices,

is

susceptible

to

esd

damage,

esd

damage

is

not

always

immediately

obvious,

in

that

it

can

cause

a

partial

breakdown

in

semiconductor

devices

that

might

not

immediately

result

in

a

failure.

4

ensure

that

the

installation

process

as

described

herein

is

also

performed

in

a

static-

free

environment.

Installation

The

EPC-31/32

can

be

installed

in

an

ISA

bus

passive

backplane

or

mounted

using

screw

holes.

If

ISA

bus

connection

is

required

when

mounted

using

the

screw

holes,

use

the

ISA

bus

header

pins.

To

mount

the

EPC-31/32

to

a

non-conductive

surface

using

the

four

screw

holes,

be

sure

to

select

a

location

where

you

have

access

to

all

available

header

pins

and

connectors.

Mounting

holes

on

the

EPC-31/32

are

1/8"

(0.125")

in

diameter,

or

3.175

mm.

The

spacing

of

the

mounting

holes

is

6.1"

(154.9

mm)

by

3.55"

(90.2

mm).

Refer

to

Appendix

A

for

a

depiction

of

the

EPC-31/32

mechanical

dimensions.

It

may

be

necessary

to

remove

the

PC

mounting

bracket

from

the

EPC-31/32

before

mounting

flat

on

a

surface.

Cooling

requirements

are

minimal.

In

most

cases

a

cooling

fan

is

not

necessary.

Refer

to

the

environmental

specifications

in

Chapter

1

for

temperature

information.

Insertion

of

the

EPC-31/32

into

an

ISA

bus

chassis

or

a

passive

backplane

is

straightforward.

Remove

a

blank

panel

from

the

chassis

and

insert

the

EPC-31/32

into

the

backplane

card

connector.

Firmly

press

the

EPC-31/32

down

to

ensure

that

the

module

is

properly

seated

in

the

backplane.

make

sure

system

power

is

off.

the

epc-31/32

cannot

be

inserted

into

or

removed

from

a

live

system.

ih

,

,

,

when

inserting

the

epc-31/32,

avoid

touching

the

circuit

board,

and

make

sure

the

environment

is

static-free.

insert

it

with

adequate

continuous

force

rather

than

tapping

or

hammering

on

it.

Power-On

Screen

Display

During

the

setup

and

configuration

of

the

EPC-31/32,

a

monitor

and

keyboard

are

required.

Whenever

a

hardware

reset

of

the

EPC

occurs,

the

system

performs

a

POST.

If

not

set

for

"quick

boot,"

the

POST

displays

information

showing

the

status

of

the

BIOS

self-test.

If

everything

proceeds

normally,

the

screen

image

displays

approximately

as

shown

below.

486

Modular

BIOS

V3.0Sabd.

Copyright

(e)

1964-90

Award

Software

Inc.

Copyright

1993

RadiSys

Corporation

Flash

BIOS

V3.0S

TESTING

INTERRUPT

CONTROLLER

#1

.OK

TESTING

INTERRUPT

CONTROLLER

#2

.OK

TESTING

CMOS

BATTERY.OK

TESTING

CMOS

CHECKSUM.OK

SIZING

SYSTEM

MEMORY.

640K

FOUND

TESTING

SYSTEM

MEMORY.

640K

OK

CHECKING

UNEXPECTED

INTERRUPTS

AND

STUCK

NMI

.DK

TESTING

PROTECTED

MODE.OK

SIZING

EXPANSION

MEMORY.

3328R

FOUND

TESTING

MEMORY

IN

PROTECTED

MODE

.

4352K

FOUND

TESTING

ONBOARD

SERIAL

PORT

#1.OK

TESTING

ONBOARD

SERIAL

PORT

#2.OK

TESTING

ONBOARD

PARALLEL

PORT.OK

RadiSys

EPC

Setup

Program

Figure

1.

POST

Display.

If

errors

occur

during

the

power-on

self-test,

the

BIOS

displays

the

error

on

the

appropriate

line

of

the

screen

display

and

attempts

to

continue.

For

instance,

if

a

failure

is

discovered

in

COM1,

the

BIOS

disables

COM1,

displays

the

error

on

the

line

"TESTING

ONBOARD

SERIAL

PORT

#1."

and

then

continues

as

if

the

error

did

not

occur.

It

is

important

to

watch

the

POST

display

to

verify

that

no

errors

occur.

If

error

messages

are

displayed

during

or

after

the

POST

display,

see

chapter

5,

Troubleshooting

&

Error

Messages.

BIOS

Setup

Screen

The

EPC-31/32

BIOS

contains

a

setup

function

to

display

and

alter

the

system

configuration.

This

configuration

information

is

maintained

in

the

EPC-31/32’s

battery-backed

CMOS

RAM

and

is

used

by

the

BIOS

to

initialize

the

EPC-31/32.

The

setup

function

can

be

invoked

any

time

after

the

POST

completes

and

first

clears

the

screen.

Simultaneously

press

the

CTRL+ALT+ESC

keys.

This

may

be

done

during

system

operation

in

most,

but

not

all

circumstances.

Some

programs

that

take

control

of

the

keyboard

at

a

low

level,

such

as

Microsoft

Windows,

cause

this

key

sequence

to

be

interpreted

differently,

or

not

at

all.

It

should

always

work,

however,

when

the

DOS

operating

system

prompt

is

shown

on

the

screen.

The

main

setup

screen

displays

similar

to

the

following:

RadiSys

EPC-31

CMOS

Setup,

Flash

System

BIOS

V3.05

486SX,

4

MBytes

memory,

487SX

not

present

Date

(mm/dd/yy)

Time

(hh:mm:ss)

Configuration

Errors

Diskette

Drive

A

Diskette

Drive

B

Fixed

Disk

Drive

C

Fixed

Disk

Drive

D

01/12/90

09:34:56

Halt

on

all

errors

1.4M

3.5

inch

None

AT

None

Cache

Enabled

Quick

Boot

Disabled

Update

BIOS

Disabled

Coml:

Enabled

F2

=

Fixed

Disk

Menu

Coiu2:

Enabled

F10

=

Save

CMOS

LPT1:

Enabled

ESC=

Exit

without

saving

Floppy

Enabled

move

between

items

IDE

Enabled

select

values

Figure

2.

Main

Setup

Screen.

Use

the

up

and

down

arrow

keys

to

move

the

cursor

from

field

to

field.

For

most

fields,

once

the

cursor

is

positioned

at

the

field,

pressing

the

left

and

right

cursor

(arrow)

keys

will

scroll

through

the

available

choices.

Once

the

screen

has

been

changed

to

appear

as

you

desire,

press

the

FI0

function

key

to

save

the

changes

in

battery-backed

CMOS

RAM.

Then

press

the

F5

function

key

to

confirm

the

changes

and

reboot,

FI

to

confirm

changes

but

not

reboot

or

ESC

to

ignore

any

changes

and

exit.

Each

field

is

explained

below.

Date

and

Time

These

values

are

changed

by

moving

to

them

and

typing

in

the

format

shown.

Configuration

Errors

This

field

provides

several

choices

about

the

situations

under

which

the

BIOS

should

wait

for

user

input

if

a

configuration

error

is

found.

The

selections

are:

1)

Halt

on

all

errors

2)

Ignore

all

errors

3)

Ignore

keyboard

errors

(allows

operation

without

a

keyboard)

4)

Ignore

disk

errors

5)

Ignore

keyboard

and

disk

errors

Diskette

Drive

This

field

gives

you

several

choices

about

the

type

of

floppy

disk

drives

installed

as

the

A

and

B

drives.

Toggle

the

entry

to

match

the

type

of

diskette

drive(s)

attached.

If

no

floppy

drive

is

attached,

select

NONE

for

each

diskette

drive

field.

Fixed

Disk

Drive

This

display-only

field

shows

the

type

of

disk

selected

from

the

fixed

disk

menu.

Possible

values

are

None,

AT

and

FLASH.

To

see

the

detailed

characteristics

of

the

device

or

to

change

the

device,

use

the

F2

function

key

to

go

to

the

fixed

disk

menu.

See

the

section

Fixed

Disk

Mem.

This

applies

only

to

IDE

disk

drives

attached

directly

to

the

EPC-31/32

and

onboard

flash,

and

does

not

apply

to

any

external

drives

connected

to

other

disk

controllers.

Cache

Toggling

this

field

enables

or

disables

the

cache.

The

default

is

to

enable

the

cache.

Quick

Boot

This

field

enables

or

disables

the

quick

boot

option.

When

quick

boot

is

disabled,

a

hard

boot

causes

the

system

to

display

the

results

of

the

POST

and

runs

the

memory

test.

When

quick

boot

is

enabled,

the

system

runs

the

POST

except

the

memory

test

and

displays

"Quick

boot

enabled:

disable

through

Setup

screen

to

view."

Update

BIOS

Toggling

this

field

enables

or

disables

the

BIOS

serial

update

feature.

When

disabled,

the

system

boots

normally.

When

enabled,

the

system

searches

for

10

seconds

on

COM1

for

clear-to-send

(CTS)

synchronization

from

an

external

host.

The

external

host

must

be

currently

running

the

NEWBIOS.EXE

program

(refer

to

Flash

BIOS

updating

in

Chapter

3).

If

the

system

can

synchronize

with

the

host,

the

BIOS

on

the

EPC-31

is

reflashed

and

updated.

Note

that

the

field

must

be

disabled

on

the

next

pass

through

the

boot

process.

If

the

system

cannot

synchronize,

after

ten

seconds

the

boot

continues.

COM1/COM2

Toggling

these

fields

enables

or

disables

the

built-in

COM1

and

COM2

ports.

LPT1

Toggling

this

field

enables

or

disables

the

built-in

LPT1

parallel

port.

Floppy

Toggling

this

field

enables

or

disables

the

built-in

floppy

controller.

If

using

an

external

floppy

controller,

disable

the

EPC-31/32

floppy

controller.

IDE

Toggling

this

field

enables

or

disables

the

built-in

IDE

hard

drive

interface.

If

using

an

external

IDE

controller,

disable

the

EPC-31/32

IDE

controller.

Fixed

Disk

Menu

The

Fixed

Disk

Menu

is

used

to

define

the

type

of

hard

disk(s)

installed

in

the

system

using

the

onboard

IDE

disk

controller

or

Flash.

Enter

the

fixed

disk

menu

screen

by

pressing

the

F2

function

key

from

the

main

setup

screen.

The

Fixed

Disk

Menu

screen

is

similar

to

the

following:

RadiSys

EPC-31

Fixed

Disk

Menu,

Flash

System

BIOS

V3.05

486SX,

4

MBytes

memory,

487SX

present

Fixed

Disk

Drive

C:

AT

Type

17

41

MBytes:

977

Cyls,

5

Heads,

17

Sectors

Landing

Zone:

977

Precompensation:

300

Fixed

Disk

Drive

D:

None

F10

-

Save

and

return

ESC

-

Return

without

saving

move

between

items

select

values

Figure

3.

Fixed

Disk

Menu

Screen.

Use

the

up

and

down

cursor

keys

()

to

move

between

items.

Use

the

left

and

right

cursor

keys

(

)

to

scroll

through

the

available

choices

for

each

item.

Disk

type

AT

denotes

IDE-compatible

drives.

You

can

scroll

through

a

set

of

numbered

types;

the

physical

configuration

is

displayed

for

each.

Scroll

through

the

numeric

drive

types

to

find

the

one

matching

the

characteristics

of

the

hard

drive

installed.

Refer

to

the

reference

manual

that

accompanied

the

hard

drive.

Choose

disk

type

Onboard

Flash

if

you

are

using

the

onboard

flash

memory.

This

flash

memory

can

be

made

the

boot

device

by

making

onboard

Flash

the

drive

C:

type.

However,

if

Drive

C:

is

onboard

Flash,

Drive

D:

must

be

set

to

None.

You

cannot

set

the

onboard

Flash

as

the

C:

drive

AND

use

an

external

disk

controller

(IDE

or

SCSI)

to

provide

a

D:

drive.

User-Definable

Drive

Types

If

the

correct

AT

disk

type

is

not

listed,

the

EPC-31/32

provides

user-editable

drive

types

48

and

49.

Select

either

of

these

drive

types.

Use

the

TAB

key

()or

the

left

and

right

cursor

keys

(

)

to

move

to

the

next

(or

previous)

field.

Note

that

the

default

settings

for

MBytes,

Cylinders,

Heads,

and

Sectors

is

1.

MBytes

is

a

display-only

field

calculated

by

the

BIOS.

Move

the

cursor

to

each

field

(Cyls,

Heads,

and

Sectors)

and

type

the

value

for

that

field.

The

BIOS

allows

use

of

the

following

maximum

values:

Cylinders

1023

Heads

16

Sectors

63

The

hard

disk

you

are

using

may

have

parameters

larger

than

the

allowable

maximum.

If

the

number

of

cylinders

for

your

drive

is

greater

than

the

maximum

allowable

number,

you

may

have

to

use

1023

cylinders

which

will

limit

the

usable

size

of

the

drive.

However,

most

IDE

drives

support

universal

translation

mode.

If

the

drive

you

are

using

supports

this

mode

and

the

actual

parameters

are

greater

than

the

allowable

maximum,

divide

the

actual

number

of

cylinders

by

2

and

multiply

the

actual

number

of

heads

by

2.

That

is,

each

sector

is

addressed

as

an

absolute

sequential

sector

number.

Since

the

drive

converts

the

sector

data

to

an

absolute

number,

these

"false"

cylinder

and

head

numbers

will

still

allow

the

full

capacity

of

the

drive

to

be

used.

The

following

example

shows

how

this

is

done.

Actual

parameters

Conversion

factor

Numbers

to

Use

Cylinders

1350

divide

by

2

675

Heads

5

multiply

by

2

10

Sectors

32

(none)

32

Total

Sectors

216,000

216,000

Table

2.

Fixed

Disk

Conversion

Values.

After

the

fixed

disk(s)

have

been

configured,

press

F10

to

save

the

data

or

ESC

to

ignore

the

changes.

In

either

case

you

return

to

the

main

setup

screen.

Follow

the

instructions

on

the

screen

to

save

and

exit

or

ignore

changes

and

exit.

3.

Theory

of

Operation

This

chapter

contains

information

about

the

following:

EPC-31/32

processor

and

coprocessor

EPC-31/32

memory

map

and

memory

expansion

ROM

shadowing

Battery

Speaker

Miscellaneous

connector

Resetting

the

EPC-31/32

Watchdog

timer

Power

and

cooling

requirements

Fuse

SVGA

video

controller

Flat

panel

support

Hash

disk

sub

system

Utilities

software

diskette

COM

and

Parallel

ports

AT/ISA

bus

Processor

and

Coprocessor

Hie

EPC-31

uses

the

25

MHz

Intel466

SX

CPU,

which

does

not

contain

an

integrated

math

coprocessor.

Hie

EPC-32

uses

the

Intel486

DX

CPU,

which

runs

at

33

MHz

and

contains

an

integrated

math

coprocessor.

Note

that

this

is

not

a

socketed

part,

and

therefore

is

not

field-upgradable.

The

board

design

uses

the

VLSI

technology

VL82C486

AT

chip

set

to

interface

the

80486

to

the

AT-bus.

The

VL82C486

and

its

companion

chip,

the

VL82C114,

contain

the

following

standard

PC

peripheral

functions:

two

82C37A

DMA

controllers,

two

82C59A

interrupt

controllers,

an

82C54

timer/counter,

a

74LS612

memory

mapper,

486

to

AT

bus

data,

address,

and

control

strobe

buffers,

a

real

time

clock

with

128

bytes

of

battery

backed

SRAM,

a

PC

compatible

keyboard

controller,

a

DRAM

controller,

and

several

miscellaneous

functions.

Besides

the

standard

AT

peripheral

registers,

the

VL82C486

contains

28

control

registers

that

allow

program

control

of

DRAM

access

timing,

memory

mapping,

and

several

other

functions.

These

registers

can

only

be

accessed

indirectly

by

writing

an

indirect

register

address

to

OxEC,

and

following

this

write

with

an

I/O

access

to

OxED

to

perform

the

actual

read/write

of

the

register

desired.

Most

of

these

functions

are

only

set

once

by

the

BIOS

at

reset

time.

The

BIOS

or

application

software

may

disable

access

to

these

registers

by

performing

an

I/O

write

to

0xF9.

Re-enabling

access

to

the

registers

is

accomplished

by

performing

a

dummy

I/O

write

to

OxFB.

Memory

Hie

EPC-31/32

can

have

an

on-boaid

base

memory

configuration

of

0

or

1

Mbyte.

When

present,

the

base

memory

is

soldered

on

the

motherboard.

This

base

memory

can

be

expanded

using

a

4,8

or

16

MByte

SIMM

module.

Additional

RAM

is

supported

via

the

ISA-bus

(up

to

a

maximum

of

16

MBytes

total).

After

power

on

reset,

the

BIOS

will

find

and

size

memory

present

in

the

system.

The

DRAM

timing

(in

CPU

clocks)

in

a

25MHz

EPC-31

system

is

set

to

enable

the

80486

bus

to

achieve

4-2-2-2

timing

on

burst

reads

that

"hit"

a

previously

activated

page.

The

33

MHz

EPC-32

system

is

set

to

enable

the

80486

bus

to

achieve

4-3-3-3

timing.

The

DRAM

controller

is

set

to

map

80486

addresses

in

the

region

from

0x000A0000

to

OxOOOEFFFF

to

the

AT-bus

(with

the

exception

of

OxOOOCOOOO

-

0x000C7FFF,

the

video

BIOS,

which

will

be

shadowed

into

main

DRAM).

Memory

references

to

these

addresses

will

not

be

cacheable

by

the

80486SX.

Memory

accesses

beyond

the

installed

DRAM

are

automatically

sent

to

the

AT

bus.

Accesses

above

128MB

wrap

back

around

to

address

0.

Memory

Expansion

A

single

72-pin

SIMM

socket

is

provided

for

memory

expansion.

SIMM

memory

occupies

bank

2.

A