VTECH INDUSTRIES, INC.

486 SERIES (MINI CASE) ASIC II (3 VESA SLOTS)

Processor

80486SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive

Processor Speed

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

Chip Set

Unidentified

Max. Onboard DRAM

32MB

Cache

128/256KB

BIOS

Unidentified

Dimensions

330mm x 218mm

I/O Options

32-bit VESA local bus slots (3), PS/2 mouse connector

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Front panel connector

J1

PS/2 mouse connector

J27

External battery

J3

Speaker

J29

Processor power connector

J10

32-bit VESA local bus slots

SL1 - SL3

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Battery type select internal

JP8

pins 1 & 2 closed

 

Battery type select external

JP8

pins 2 & 3 closed

VESA card select supports write back cache

JP10

pins 1 & 2 closed

 

VESA card select does not support write back cache

JP10

pins 2 & 3 closed

Factory configured - do not alter

JP14

pins 1 & 2 closed

Monitor type select CGA/EGA/VGA

JP19

Closed

 

Monitor type select MDA/EGA/VGA

JP19

Open

CMOS memory normal operation

JP20

pins 1 & 2 closed

 

CMOS memory clear

JP20

pins 2 & 3 closed

Mouse IRQ12 disabled

JP21

Open

 

Mouse IRQ12 enabled

JP21

Closed

CPU type select all

JP32

Open

 

CPU type select Pentium Overdrive

JP32

pins 2 & 3 closed

Factory configured - do not alter

JP33

pins 1 & 2 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

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

20MB

(4) 1M x 9

(4) 4M x 9

32MB

(4) 4M x 9

(4) 4M x 9

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG (Bank 0)

TAG (Bank 1)

128KB

(4) 32K x 8

NONE

(2) 8K x 8

(2) 8K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(2) 8K x 8

(2) 8K x 8

CACHE JUMPER CONFIGURATION

Size

JP2

128KB

pins 1 & 2 closed

256KB

pins 2 & 3 closed

CPU UPGRADE CONFIGURATION

Type

JP1

None installed

pins 1 & 2 closed

SX/DX/DX2 series installed

pins 2 & 3, 4 & 5 closed

Overdrive series installed

pins 1 & 2, 5 & 6 closed

Note: There is a PQFP CPU installed but the location is unidentified. These CPU types are installed in the PGA socket.

CPU SPEED CONFIGURATION

Speed

JP13

25MHz

pins 5 & 6 closed

33MHz

pins 1 & 2, 3 & 4 closed

50iMHz

pins 5 & 6 closed

66iMHz

pins 1 & 2, 3 & 4 closed

CPU SPEED CONFIGURATION

Speed

JP11

2x

pins 1 & 2 closed

2.5x

pins 2 & 3 closed

3x

Open

BUS SPEED CONFIGURATION

CPU speed

JP9

<= 33MHz

pins 1 & 2 closed

> 33MHz

pins 2 & 3 closed

KEYBOARD CONFIGURATION

Type

JP12

JP15

JP16

JP17

JP18

Internal

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

External

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

Note: Pins designated should be in the closed position.