EPSON Equity 4+

System Memory Map

23FFFFF36MB

Extended memory

0199909

 

1MB

 

System BIOS

 

(Shadow RAM, 64KB)

OOFOCKKI

 

 

Reserved for system BIOS (64KB)

 

OOEOOOO

 

 

Resewed for ROM on I/O cards

 

99C7FFF

 

 

VGA BIOS ROM (Shadow, 32KB)

 

oocoooo

 

 

VGA Color Text

 

0088000

 

 

VGA Mono Text

 

ooBoooo

 

 

VGA Graphics

 

oOA9CUl9

 

 

Base memory

 

oooooOO

 

 

 

 

Jumper and DIP Switch Settings

Display Adapter and CPU Jumper Settings

Jumper

Setting

Function

J3

A’

Enable the built-in VGA adapter

BDisable the built-in VGA adapter so you can use a d&play adapter on an option card as your primary adapter

J4

A.*

Select DX2 CPU

Bselect sx CPU

*Factory setting ** Factory set according to system CPU

External Cache Jumper Settings

Cache size

1 JS

1 J6

1 J7

1 J8

1

J9

OKB’

lB

]B

jB

jB

 

IA

32KB

A

A

A

A

 

A

64KB

A

B

A

B

 

A

128KB

B

B

A

A

 

A

1256KB

lB

]B

]B

lB

 

IB

•Factory setting; change jumpers only if external cache chips are installed

Hard Disk Drive Jumper Settings

Made1 Number

I Single Drive

I

Master Drive

1

Slave Drive

ConnerCP39194H

I

C/D jumpered I

CD and DSP jumpered I

no jumpers

ConnerCP39174E

 

C/D jumpered

 

C/D jumpered

 

no jumpers

Quantum LPS249AT

DS jumpered’

 

DSjumpers@

 

no jumpers’

•If CS (cable selection) is jumpered, the drive is a master if pin-28 is grounded and a stave if pin-28 is not grounded.

DIP Switch Settings

Switch

Setting

Function

1 •*

ON

33 MHz CPU speed

2t*

OFF

25 MHz CPU soeed

ON

25 MHz CPU speed

3*t

OFF

33 MHz CPU speed

ON

CPU present in PGA socket

 

OFF

CPU absent from PGA socket

4

ON’

Enable password secutfty feature

 

O f f

Disabte password security feature

5

ON’

Select color monitor

 

OFF

Select monochrome monitor

* Factory setting • * Factory set according to system type

Processor Chips

The 4SX/25 system 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/25 accepts the Intel 487SX/25 microprocessor with built-m math coprocessor.

SIMM lnstallation

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.

The following table shows the possible SIMM configurations; do not install memory in any other configuration.

SIMM Configurations

 

SIMM1

1 SIMM2

I Total

 

 

 

0

IO

i 4MB’

 

 

 

1MB

lo

I5MB”

 

 

 

4MB

 

IO

1

8MB”

I

 

 

1MB

 

4MB

 

9MB”

 

 

 

4MB

 

4MB

 

12MB

 

 

 

16MB

 

0

 

29MB”

 

 

 

1MB

 

I16MB

 

I21MB”

 

 

 

4MB

I16MB

1

24MB”

 

 

I

16MB

I

16MB

I36MB

I

 

 

 

 

 

 

 

 

•Standard memory on the system board ** SlMMs can occupy either socket

EPSON Equity 4+ 6

10/1/93