VIPER803 Motherboard Settings and Configuration

Device Type	Single board computer
Processor	80486SX/80486DX/80486DX2/80486DX4
Processor Speed	50(internal)/66(internal)/75(internal)/100(internal)MHz
Chip Set	VLSI 82C486
Video Chip Set	Chips and Technology
Maximum Onboard Memory	16MB
Maximum Video Memory	1MB
Cache	128/512KB
BIOS	AMI
Dimensions	181mm x 122mm
I/O Options	Floppy drive interface, IDE interface, SCSI interface, parallel port, serial ports (2), VGA port, PC/104 connectors (2)

CONNECTIONS
Purpose	Location	Purpose	Location
IDE interface	J1	Chassis fan power	J8
Floppy drive interface	J2	Power connector	J9
Multifunction connector	J3	PS/2 mouse interface	J10
Serial port 2	J4	VGA port	J12
SCSI interface	J5	Parallel port	J13
Flat panel connector	J6	PC/104 connector	P1
Serial port 1	J7	PC/104 connector	P2

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Normal boot enabled	J11	Open
	Emergency boot enabled	J11	Closed
»	IOCHRDY signal to IDE interface disabled	W1	Open
	IOCHRDY signal to IDE interface enabled	W1	Closed
»	Watchdog timer enabled	W2	Closed
	Watchdog timer disabled	W2	Open
»	Power fail monitoring disabled	W3	Open
	Power fail monitoring enabled	W3	Closed
»	Flash disk write enabled	W4	Closed
	Flash disk write disabled	W4	Open
»	SCSI address select 340H	W5	Open
	SCSI address select140H	W5	Closed
»	Flash BIOS write enabled	W6	Closed
	Flash BIOS write disabled	W6	Open
»	Pixel clock polarity positive	W7	Pins 1 & 2 closed
	Pixel clock polarity negative	W7	Pins 2 & 3 closed
»	Battery type select internal	W10	Pins 1 & 2 closed
	Battery type select external	W10	Pins 2 & 3 closed
»	Power failure select external power fail input to pin 6 on J9	W13	Pins 1 & 2 closed
	Power failure select internal/external battery < 3v	W13	Pins 2 & 3 closed
»	On board video enabled	W26/pins 1 & 2	Open
	On board video disabled	W26/pins 1 & 2	Closed
»	Factory configured – do not alter	W26/pins 3 & 4	Unidentified
»	Standard mode enabled	W26/pins 5 & 6	Open
	VT100 mode enabled	W26/pins 5 & 6	Closed
»	Serial normal mode enabled	W26/pins 7 & 8	Open
	Serial download mode enabled	W26/pins 7 & 8	Closed
»	PS/2 mouse disabled	W27	Open
	PS/2 mouse enabled	W27	Closed
»	Monitor type select color	W32	Open
	Monitor type select monochrome	W32	Closed

SIMM CONFIGURATION
Size	Bank 0
4MB	(4) 1M x 9
16MB	(4) 4M x 9

CACHE CONFIGURATION

Note: The location of the cache is unidentified.

VIDEO MEMORY CONFIGURATION

Note: The location of the video memory is unidentified.

CPU SPEED SELECTION
Speed	W29
50iMHz	Pins 1 & 2, 3 & 4, 5 & 6 closed
66iMHz	Pins 3 & 4, 5 & 6 closed
75iMHz	Pins 1 & 2, 3 & 4, 5 & 6 closed
100iMHz	Pins 3 & 4, 5 & 6 closed

CPU TYPE SELECTION
Type	W22	W24	W25
80486SX	Pins 1 & 2 closed	Open	Open
80486DX	Pins 2 & 3 closed	Closed	Pins 1 & 2 closed
80486DX2	Pins 2 & 3 closed	Closed	Pins 1 & 2 closed
80486DX4	Pins 2 & 3 closed	Closed	Pins 1 & 2 closed
ODP486	Pins 2 & 3 closed	Closed	Pins 1 & 2 closed

BUSCLK SIGNAL SELECTION
Speed	W21
16MHz	Pins 2 & 3 closed
25MHz	Pins 1 & 2 closed
33MHz	Open

DMA CHANNEL SELECTION
Channel		W28	W31
»	None	Open	Open
	1	Pins 1 & 2 closed	Pins 1 & 2 closed
	3	Pins 2 & 3 closed	Pins 2 & 3 closed

PARALLEL PORT INTERRUPT SELECTION
IRQ		W30
	5	Pins 1 & 2 closed
»	7	Pins 2 & 3 closed
	None	Open

SERIAL PORT 2 SELECTION
Setting		W17	W18	W19	W20
»	RS-232	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 1 & 2 closed
	RS-422	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed
	RS-485	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed

SERIAL PORT LOOPBACK SELECTION
Setting		W11	W12
»	Normal	Open	Open
	Loopback	Closed	Closed

I/O ADDRESS SELECTION
Address		W23
»	190H	Pins 1 & 2, 3 & 4 closed
	290H	Pins 1 & 2 closed
	390H	Pins 3 & 4 closed
	390H	Open

SCSI DMA CHANNEL SELECTION
Channel		W14	W15
»	None	Open	Open
	0	Pins 1 & 2 closed	Pins 2 & 3 closed
	5	Pins 2 & 3 closed	Pins 1 & 2 closed

SCSI INTERRUPT SELECTION
IRQ		W16
	10	Pins 1 & 2 closed
	11	Pins 2 & 3 closed
»	None	Open

EDOUT SELECTION
Setting	W8
EDOUT left to software	Open
EDOUT to pin 29 & ground to pin 17	Pins 1 & 3, 2 & 4 closed
EDOUT to pin 17 & ground to pin 29	Pins 1 & 2, 3 & 4 closed
Note: The above listed pins are located on J2.

HDOUT SELECTION
Setting	W9
HDOUT left to software	Open
HDOUT to pin 33 & ground to pin 27	Pins 1 & 3, 2 & 4 closed
HDOUT to pin 27 & ground to pin 33	Pins 1 & 2, 3 & 4 closed
Note: The above listed pins are located on J2.