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LASER 386SX/2, 386SX/3

VTECH INDUSTRIES, INC.

LASER 386SX/2, 386SX/3

Device Type

Mainboard

Processor

80386SX

Processor Speed

16/20/25MHz

Chip Set

Unidentified

Video Chip Set

None

Maximum Onboard Memory

4MB

Maximum Video Memory

None

Cache

None

BIOS

Unidentified

Dimensions

305mm x 244mm

I/O Options

Floppy drive interface, game port, IDE interface, serial ports (2), parallel port

NPU Options

80387SX

CONNECTIONS

Purpose

Location

Purpose

Location

Parallel port

CN1

IDE interface

J10

Game port

CN2

Floppy drive interface

J12

Serial port

CN3

Speaker

J15

Serial port

CN4

IDE interface LED

JP32

Front panel connector

J4

Riser slot

SL1

USER CONFIGURABLE SETTINGS

Function

Label

Position

»

Factory configured - do not alter

J1

Unidentified

»

Factory configured - do not alter

J2

Unidentified

»

Factory configured - do not alter

JP17

Unidentified

 

Floppy drive interface enabled

JP28

Open

 

Floppy drive interface disabled

JP28

Closed

 

IDE interface enabled

JP29

Closed

 

IDE interface disabled

JP29

Open

 

Parity enabled

JP33

Closed

 

Parity disabled

JP33

Open

 

NPU not installed

JP40

Pins 1 & 2 closed

 

NPU installed

JP40

Pins 2 & 3 closed

 

Interleave mode enabled

JP42

Pins 1 & 2 closed

 

Interleave mode disabled

JP42

Pins 2 & 3 closed

Note: The location of JP28 is unidentified.

MEMORY CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

44256

44256

None

None

1.5MB

44256

44256

(2) 256K x 9

None

2MB (A)

44256

44256

(2) 256K x 9

(2) 256K x 9

2MB (B)

None

None

(2) 1M x 9

None

4MB

None

None

(2) 1M x 9

(2) 1M x 9

Note: The number of 44256 chips is unidentified. Parity chips are 4464. The location and amount of chips used is unidentified.

MEMORY SWITCH CONFIGURATION

Size

SW1/1

SW1/2

SW1/3

SW1/4

SW1/5

1MB

On

On

On

Off

On

1.5MB

On

On

On

Off

On

2MB (A)

On

On

On

Off

On

2MB (B)

On

Off

Off

Off

On

4MB

On

Off

Off

Off

On

Note: The location of the switch is unidentified.

MEMORY SWITCH CONFIGURATION (CON’T)

Size

SW1/6

SW1/7

SW1/8

SW1/9

SW1/10

1MB

On

Off

On

On

Off

1.5MB

On

Off

On

Off

On

2MB (A)

On

Off

On

Off

Off

2MB (B)

On

Off

On

On

On

4MB

On

Off

On

On

Off

Note: The location of the switch is unidentified.

SERIAL PORT INTERRUPT SELECTION

IRQ

JP18

JP19

JP20

JP22

25-pin port as COM1, IRQ4. 9-pin port COM2, IRQ3

1 & 2

2 & 3

2 & 3

1 & 2

25-pin port as COM2, IRQ3. 9-pin port COM1, IRQ4

2 & 3

1 & 2

1 & 2

2 & 3

Note: Pins designated should be in the closed position. JP25 & JP26 are used to set 3E8 and 2E8. The configuration is unidentified.

PARALLEL PORT INTERRUPT SELECTION

IRQ

JP16

JP21

IRQ7

Pins 2 & 3 closed

Pins 1 & 2 closed

IRQ5

Pins 1 & 2 closed

Pins 2 & 3 closed

Disabled

Open

Open