Device Type

Mainboard

Processor

80486SX/80486DX/80486DX2/80487SX/P24T

Processor Speed

25/33/40/50(internal)/50/66(internal)MHz

Chip Set

VIA VT

Maximum Onboard Memory

128MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

254mm x 218mm

I/O Options

32-bit VESA local bus slots (2)

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J2

Speaker

J12

Turbo LED

J9

Power LED & keylock

J13

Turbo switch

J10

32-bit VESA local bus slots

SL1 - SL2

Reset switch

J11

USER CONFIGURABLE SETTINGS

Function

Label

Position

Battery type select internal

J1

Pins 2 & 3 closed

Battery type select external

J1

Pins 1 & 2 closed

»

Monitor type select color

J4

Closed

Monitor type select monochrome

J4

Open

Password normal operation

J7

Pins 1 & 2 closed

Password clear

J7

Pins 2 & 3 closed

»

Factory configured - do not alter

JC5

Unidentified

»

CMOS memory normal operation

S1

Open

CMOS memory clear

S1

Closed

SIMM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(4) 256K x 9

None

2MB

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

None

5MB

(4) 1M x 9

(4) 256K x 9

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

None

17MB

(4) 4M x 9

(4) 256K x 9

20MB

(4) 1M x 9

(4) 4M x 9

20MB

(4) 4M x 9

(4) 1M x 9

32MB

(4) 4M x 9

(4) 4M x 9

64MB

(4) 16M x 9

None

65MB

(4) 16M x 9

(4) 256K x 9

68MB

(4) 16M x 9

(4) 1M x 9

80MB

(4) 16M x 9

(4) 4M x 9

128MB

(4) 16M x 9

(4) 16M x 9

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

128KB

(4) 32K x 8

None

(1) 8K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JS1

JS2

JS3

64KB

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

128KB

Pins 1 & 2 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

256KB

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 1 & 2 closed

CPU SPEED SELECTION

Speed

JK1/pins 1 & 2

JK1/pins 3 & 4

JK1/pins 5 & 6

JK1/pins 7 & 8

25MHz

Open

Open

Closed

Open

33MHz

Closed

Open

Open

Open

40MHz

Closed

Open

Closed

Closed

40MHz

Closed

Closed

Open

Open

50MHz

Open

Open

Closed

Closed

50MHz

Open

Closed

Open

Open

66iMHz

Open

Closed

Open

Closed

66iMHz

Closed

Open

Open

Closed

80iMHz

Closed

Closed

Open

Closed

Test

Open

Open

Open

Closed

Power down

Open

Open

Open

Open

CPU TYPE SELECTION

Type

JC1

JC2

JC3

JC4

80486SX

Pins 2 & 3 closed

Pins 2 & 3 closed

Open

Open

80486DX

Pins 1 & 2 closed

Pins 1 & 2 closed

Closed

Closed

80486DX2

Pins 1 & 2 closed

Pins 1 & 2 closed

Closed

Closed

80487SX

Pins 2 & 3 closed

Pins 2 & 3 closed

Open

Open

P24T

Pins 1 & 2 closed

Pins 1 & 2 closed

Closed

Closed

VL BUS WAIT STATE SELECTION

Setting

JV3

»

0

Pins 2 & 3 closed

1

Pins 1 & 2 closed

VL BUS SPEED SELECTION

Speed

JV2

<= 33MHz

Pins 2 & 3 closed

>33 MHz

Pins 1 & 2 closed

KEYBOARD SELECTION

Setting

J3

JB1

JB2

JB3

JB4

JB5

Internal

Open

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

External

Closed

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

Note: Pins designated should be in the closed position.