UNIDENTIFIED

786 ACIO VESA MOTHERBOARD

Processor

80386DX/CX486DLC/80486SX/80486DX/80486DX2

Processor Speed

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

Chip Set

Unknown

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

Unknown

Dimensions

254mm x 218mm

I/O Options

32-bit VESA local bus slots (2)

NPU Options

80387DX

CONNECTIONS

Purpose

Location

Purpose

Location

Power LED & keylock

J2

External battery

J7

Turbo switch

J4

Speaker

J100

Turbo LED

J5

32-bit VESA Local bus slot

S1

Reset switch

J6

32-bit VESA Local bus slot

S2

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Monitor type select color

J3

Closed

 

Monitor type select monochrome

J3

Open

»

CMOS memory normal operation (Internal battery)

JMP3

pins 2 & 3 closed

»

CMOS memory normal operation (External battery)

JMP3

pins 1 & 2 closed

 

CMOS memory clear

JMP3

pins 2 & 4 closed

»

NPU enabled

JMP4

pins 1 & 2 closed

 

NPU disabled

JMP4

pins 2 & 3 closed

»

Factory configured - do not alter

JMP6

pins 1 & 4 closed

»

VESA local bus enabled

JMP10

Open

 

VESA local bus disabled

JMP10

Closed

DRAM 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

32MB

(4) 4M x 9

(4) 4M x 9

Note:The exact locations of Bank 0 & Bank 1 is unknown.

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG/U26

TAG/U27

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

(1) 8K x 8

128KB

(4) 32K x 8

NONE

(1) 8K x 8

(1) 8K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

(1) 32K x 8

Note:The exact locations of Bank 0 & Bank 1 is unknown.

CACHE JUMPER CONFIGURATION

Size

JMP1A

JMP1B

JMP1C

JMP8

64KB

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 and 4 & 5

128KB

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 and 4 & 5

256KB

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 and 5 & 6

Note:Pins designated should be in the closed position.

The exact locations of Banks 0 & Bank 1 is unknown.

CPU TYPE CONFIGURATION

Type

JMP2

JMP5

JMP7

JMP12

JMP13

80386DX

Open

Closed

Open

Open

pins 2 & 3 and 5 & 6

CX486DLC

Open

Open

Closed

Closed

pins 1 & 2 and 4 & 5

80486SX

pins 1 & 2 closed

Open

Closed

Closed

pins 1 & 2 and 4 & 5

80486DX

pins 2 & 3 closed

Open

Closed

Closed

pins 1 & 2 and 4 & 5

80486DX2

pins 2 & 3 closed

Open

Closed

Closed

pins 1 & 2 and 4 & 5

Note:Pins designated should be in the closed position.

CPU SPEED CONFIGURATION

Speed

JMP9

JMP14

80386DX/25MHz

pins 1 & 5 and 2 & 6 closed

pins 1 & 2 closed

80386DX/33MHz

pins 1 & 5 and 4 & 8 closed

pins 1 & 2 closed

80386DX/40MHz

1 & 5, 3 & 7 and 4 & 8 closed

pins 1 & 2 closed

80486SX/50MHz

pins 3 & 7 closed

pins 2 & 3 closed

80486DX/25MHz

pins 2 & 6 closed

pins 1 & 2 closed

80486DX/33MHz

pins 4 & 8 closed

pins 1 & 2 closed

80486DX2/50i MHz

pins 2 & 6 closed

pins 2 & 3 closed

80486DX2/66i MHz

pins 4 & 8 closed

pins 1 & 2 closed