XINET LS3251 Motherboard Settings and Configuration

Processor	80386DX
Processor Speed	25MHz
Chip Set	C & T
Max. Onboard DRAM	16MB
SRAM Cache	None
BIOS	Award
Dimensions	355mm x 304mm
I/O Options	AUI network interface, BNC network interface, floppy drive interface, IDE interface, parallel port, serial ports (2), game port
NPU Options	80387DX

CONNECTIONS
Purpose	Location	Purpose	Location
AUI ethernet interface	C1	Game port	C6
BNC ethernet interface	C2	Floppy drive interface	C7
Parallel port	C3	IDE interface	C8
Serial port (COM2)	C4	Reset switch	JP7
Serial port (COM1)	C5

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Monitor type select monochrome	JP2	pins 2 & 3 closed
	Monitor type select color	JP2	pins 1 & 2 closed
»	CPU speed select from keyboard	JP13	pins 1 & 2 closed
	CPU speed select fast	JP13	pins 2 & 3 closed
»	Floppy drive interface enabled	JP306	pins 2 & 3 closed
	Floppy drive interface disabled	JP306	pins 1 & 2 closed
»	IDE interface enabled	J312 & J313	pins 2 & 3 closed
	IDE interface disabled	J312 & J313	pins 1 & 2 closed
»	Pipeline mode enabled	JP12	pins 1 & 2 closed
	Pipeline mode disabled	JP12	pins 2 & 3 closed

SERIAL PORT CONFIGURATION
COM1 (C5)	COM2 (C4)	JP303	JP304	JP305
Enabled	Enabled	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed
Enabled	Disabled	pins 2 & 3 closed	pins 1 & 2 closed	pins 2 & 3 closed
Disabled	Enabled	pins 1 & 2 closed	pins 2 & 3 closed	pins 2 & 3 closed
Disabled	Disabled	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed

PARALLEL PORT (C3) CONFIGURATION
LPT	I/O Address	JP301	JP302
LPT 1	3BCh	pins 1 & 2 closed	pins 2 & 3 closed
LPT 2	378h	pins 2 & 3 closed	pins 2 & 3 closed
LPT 3	278h	pins 2 & 3 closed	pins 1 & 2 closed
Disabled	N/A	pins 1 & 2 closed	pins 1 & 2 closed

ETHERNET CABLE TYPE CONFIGURATION
Cable Type		JP102	J161-J166
»	BNC	Closed	pins 1 & 2 closed
	AUI transceiver via 9-pin	Open	pins 2 & 3 closed

ETHERNET INTERRUPT REQUEST CONFIGURATION
Channel		J111	J112	J113	J114
	IRQ 3	Open	Closed	Open	Open
	IRQ 2	Closed	Open	Open	Open
	IRQ 4	Open	Open	Closed	Open
»	IRQ 5	Open	Open	Open	Closed

ETHERNET I/O BASE ADDRESS CONFIGURATION
Address		J121	J122	J123	J124
»	320h	Open	Closed	Open	Open
	300h	Closed	Open	Open	Open
	340h	Open	Open	Closed	Open
	360h	Open	Open	Open	Closed

ETHERNET BOOT ROM MEMORY ADDRESS CONFIGURATION
Address		J131	J132	J133
»	CC000h	Open	Closed	Open
	C8000h	Closed	Open	Open
	D0000h	Open	Open	Closed

NPU CONFIGURATION
Mode		JP4	JP11
»	Disabled	pins 2 & 3 closed	pins 2 & 3 closed
	Asynchronous	pins 1 & 2 closed	pins 2 & 3 closed
	Synchronous	pins 1 & 2 closed	pins 1 & 2 closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3	JP20
1MB	(4) 256K x 9	NONE	NONE	NONE	N/A
2MB	(4) 256K x 9	(4) 256K x 9	NONE	NONE	N/A
4MB	(4) 256K x 9	(4) 256K x 9	(4) 256K x 9	(4) 256K x 9	pins 1 & 2 closed
4MB	(4) 1M x 9	NONE	NONE	NONE	N/A
8MB	(4) 1M x 9	(4) 1M x 9	NONE	NONE	N/A
10MB	(4) 1M x 9	(4) 1M x 9	(4) 256K x 9	(4) 256K x 9	pins 1 & 2 closed
10MB	(4) 256K x 9	(4) 256K x 9	(4) 1M x 9	(4) 1M x 9	pins 2 & 3 closed
16MB	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9	(4) 1M x 9	pins 2 & 3 closed