VIPER801 Motherboard Settings and Configuration

Device Type	Single board computer
Processor	80386SX/CX486SLC
Processor Speed	Unidentified
Chip Set	Unidentified
Video Chip Set	Unidentified
Maximum Onboard Memory	16MB
Maximum Video Memory	1MB
Cache	None
BIOS	Unidentified
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)
NPU Options	80387SX

CONNECTIONS
Purpose	Location	Purpose	Location
IDE interface	J1	Serial port 1	J7
Floppy drive interface	J2	Power connector	J8
Multifunction connector	J3	VGA port	J10
Serial port 2	J4	Parallel port	J11
SCSI interface	J5	PC/104 connector	P1
Flat panel connector	J6	PC/104 connector	P2

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Normal boot from flash BIOS	J9	Open
	Emergency boot from ROM BIOS	J9	Closed
»	Watchdog timer enabled	W1	Closed
	Watchdog timer disabled	W1	Open
»	Flash disk write enabled	W2	Closed
	Flash disk write disabled	W2	Open
»	Flash BIOS write enabled	W4	Closed
	Flash BIOS write disabled	W4	Open
»	IOCHRDY signal to IDE interface disabled	W6	Open
	IOCHRDY signal to IDE interface enabled	W6	Closed
»	Power fail monitoring disabled	W7	Open
	Power fail monitoring enabled	W7	Closed
»	SCSI address select 340H	W8	Open
	SCSI address select140H	W8	Closed
»	Battery type select internal	W9	Pins 1 & 2 closed
	Battery type select external	W9	Pins 2 & 3 closed
»	Power failure select external power fail input to pin 6 on J8	W10	Pins 1 & 2 closed
	Power failure select internal/external battery < 3v	W10	Pins 2 & 3 closed
»	On board video enabled	W22/pins 1 & 2	Open
	On board video disabled	W22/pins 1 & 2	Closed
»	Factory configured – do not alter	W22/pins 3 & 4	Unidentified
»	Standard mode enabled	W22/pins 5 & 6	Open
	VT100 mode enabled	W22/pins 5 & 6	Closed
»	Serial normal mode enabled	W22/pins 7 & 8	Open
	Serial download mode enabled	W22/pins 7 & 8	Closed
»	SYSCLK select asynchronous	W27	Closed
	SYSCLK select synchronous	W27	Open

SIMM CONFIGURATION
Size	Bank 0	Bank 1
512KB	(2) 256K x 9	None
1MB	(2) 256K x 9	(2) 256K x 9
2MB	(2) 1M x 9	None
4MB	(2) 1M x 9	(2) 1M x 9
8MB	(2) 4M x 9	None
10MB	(2) 4M x 9	(2) 1M x 9
16MB	(2) 4M x 9	(2) 4M x 9

VIDEO MEMORY CONFIGURATION

Note: The location of the video memory is unidentified.

DMA CHANNEL SELECTION
Channel		W24	W26
»	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		W25
	None	Open
	IRQ5	Pins 1 & 2 closed
»	IRQ7	Pins 2 & 3 closed

SERIAL PORT 2 SELECTION
Setting		W18	W19	W20	W21
»	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		W16	W17
»	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		W13	W14
»	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		W15
	IRQ10	Pins 1 & 2 closed
	IRQ11	Pins 2 & 3 closed
»	None	Open

EDOUT SELECTION
Setting	W11
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	W12
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.