NEC TECHNOLOGIES, INC.

POWERMATE EXPRESS 486SX/20E, 486SX/25E

Processor

80486SX

Processor Speed

20/25MHz

Chip Set

Intel

Max. Onboard DRAM

16MB

Cache

None

BIOS

NEC

Dimensions

330.2mm x 218.4mm

I/O Options

Proprietary CPU module slot, keyboard/bus mouse interface,serial ports (2), parallel port, video port, proprietary video card sockets, proprietary external memory card slot, IDE interface, floppy drive interface

NPU Options

80487SX/4167

CONNECTIONS

Purpose

Location

Purpose

Location

Proprietary CPU module

J6

Video port

P6

Proprietary external memory card

J7

Keyboard/Bus mouse interface

P7

Proprietary video card

J8, J9, & J10

Fan power

P8

IDE interface

P1

IDE interface LED

P9

Floppy drive interface

P2

External battery

P10

Parallel port

P3

Power supply

P11 & P12

Serial port (COM1)

P4

Drive power

P13

Serial port (COM2)

P5

Drive power

P14

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Password enabled

3F1

pins 2 & 3 closed

 

Password disabled

3F1

pins 1 & 2 closed

»

Test mode disabled

10A1

Open

 

Test mode enabled

10A1

Closed

»

I/O recovery disabled

11B5

Open

 

I/O recovery enabled

11B5

Closed

»

NEC VGA adapter disabled (U.S. setting)

15A1

Open

 

NEC VGA adapter enabled

15A1

Closed

»

Manufacturing test disabled

15K1

closed

 

Manufacturing test enabled

15K1

open

»

BIOS flash reprogramming disabled

17H1

pins 2 & 3 closed

 

BIOS flash reprogramming enabled

17H1

pins 1 & 2 closed

»

ROM type select 27C256 (28F256)

18F1

pins 1 & 2 closed

 

ROM type select 27C512 (28F512)

18F1

pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

4MB

(2) 256K x 36

(2) 256K x 36

8MB

(2) 1M x 36

NONE

16MB

(2) 1M x 36

(2) 1M x 36

PARALLEL PORT CONFIGURATION

Setting

15C3

LPT1/IRQ7, LPT2/IRQ5

pins 1 & 2, 5 & 6 closed

LPT1/IRQ5, LPT2/IRQ7

pins 2 & 3, 4 & 5 closed

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Test mode disabled

15A2 & 15A3

pins 1 & 2 closed

 

Test mode enabled

15A2 & 15A3

pins 2 & 3 closed