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

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