Epson 4+ Benutzerhandbuch

EPSON Equity 4+

23FFFFF

Extended memory

System BIOS

(Shadow RAM, 64KB)

OOEOOOO

Reserved for system BIOS (64KB)

oocoooo

oooooOO

Resewed for ROM on I/O cards

VGA BIOS ROM (Shadow, 32KB)

VGA Color Text

VGA Mono Text

VGA Graphics

Base memory

A’

Enable the built-in VGA adapter

B

Disable 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

B

select sx CPU

 Factory setting

 Factory set according to system CPU

Cache 

size

32KB

A

A

A

A

A

A

B

A

B

A

128KB

B

B

A

A

A

l

Factory setting; change jumpers only if external cache 

 are installed

 Slave 

Conner 

 C/D 

  

 and DSP 

  no jumpers

Conner 

 

 

no jumpers

Quantum 

 DS 

DS 

no jumpers’

l

 CS (cable selection) is 

 the drive is a master if pin-28 is grounded

and a stave if pin-28 is not grounded.

1

 

Function
33 MHz CPU speed
25 MHz CPU 

2

ON

25 MHz CPU speed

OFF

33 MHz 

 speed

3

ON

CPU present in PGA socket

OFF

CPU absent from PGA socket

4

ON’

Enable password 

 feature

O f f

 password security feature

5

ON’

Select color monitor

OFF

Select monochrome monitor

 Factory setting

l 

* Factory set according to system type

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.

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.

 4MB’

4MB

 

4MB

4MB

4MB

12MB

0

4MB

 

 

 

I

l

Standard memory on the system board

 can occupy either socket