POSITIVE CORPORATION

PC425

Processor

80486SX

Processor Speed

25MHz

Chip Set

Unidentified

Max. Onboard DRAM

5MB

Cache

None

BIOS

Unidentified

Dimensions

254mm x 218mm

I/O Options

Parallel port, serial ports (2), VGA port, floppy drive interface, IDE interface, riser slot

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Serial port 2

J2

External battery

J12

Serial port 1

J3

Power/speed indicator

J17

Parallel port

J4

VGA port

J22

Speaker

J6

Riser Card

SL1

Floppy drive interface

J10

Reset switch

SW1

IDE interface

J11

   

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

Factory configured - do not alter

E1

pins 2 & 3 closed

IDE interface interrupt enabled

E2

pins 1 & 2 closed

 

IDE interface interrupt disabled

E2

Open

Factory configured - do not alter

E3

pins 2 & 3 closed

Factory configured - do not alter

E4

pins 2 & 3 closed

Factory configured - do not alter

E5

pins 2 & 3 closed

Factory configured - do not alter

E8

pins 1 & 2 closed

Factory configured - do not alter

E9

pins 2 & 3 closed

Parity disabled

E10

pins 2 & 3 closed

 

Parity enabled

E10

pins 1 & 2 closed

Factory configured - do not alter

E11

pins 2 & 3 closed

Onboard RAM 256KB to 512KB enabled

sw2/1

Off

 

Onboard RAM 256KB to 512KB disabled

sw2/1

On

Onboard RAM 512KB to 640KB enabled

sw2/2

Off

 

Onboard RAM 512KB to 640KB disabled

sw2/2

On

Security enabled

sw2/3

Off

 

Security disabled

sw2/3

On

Factory configured - do not alter

sw2/4

Off

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

1MB

NONE

5MB

1MB

(4) 1M x 9

Note: Bank 0 is factory installed and is not configurable. The location is unidentified.

IDE CONFIGURATION

Setting

E6

E7

Primary

pins 2 & 3 closed

pins 2 & 3 closed

Secondary

pins 1 & 2 closed

pins 1 & 2 closed