LASER 386SX/2, 386SX/3 Motherboard Settings and Configuration

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

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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