DS486 Motherboard Settings and Configuration

Processor	80486SX/80486DX/80486DX2/80486DX4
Processor Speed	33/66(internal)/100(internal)MHz
Chip Set	Intel
Video Chip Set	None
Maximum Onboard Memory	128MB
Maximum Video Memory	None
Cache	256KB
BIOS	Phoenix
Dimensions	337mm x 122mm
I/O Options	Floppy drive interface, IDE interface, SCSI interface, parallel port, PS/2 mouse interface, serial ports (2), PCI video module connector
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
SCSI interface	CN1	Serial port 1	CN6
IDE interface	CN2	Parallel port	CN7
PS/2 mouse & keyboard interface	CN3	PCI video module connector	CN8
Floppy drive interface	CN4	AT keyboard connector	CN9
Serial port 2	CN5	Hard drive LED	JP20

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	PCI bus speed select 33MHz	JP2	Pins 2 & 3 closed
	PCI bus speed select 25MHz	JP2	Pins 1 & 2 closed
»	Factory configured - do not alter	JP4	Pins 1 & 2 closed
»	Factory configured - do not alter	JP13	Pins 2 & 3 closed
»	Factory configured - do not alter	JP14	Pins 2 & 3 closed
»	Factory configured - do not alter	JP17	Unidentified
»	Factory configured - do not alter	JP19	Unidentified
»	SCSI speed select 33MHz	JP24	Pins 2 & 3 closed
	SCSI speed select 40MHz	JP24	Pins 1 & 2 closed
»	Watchdog timer enabled	JP25	Pins 1 & 2 closed
	Watchdog timer disabled	JP25	Pins 2 & 3 closed
»	PS/2 IRQ12 enabled	JP26	Pins 1 & 2 closed
	Next Step OS used	JP26	Pins 2 & 3 closed
»	Monitor type select color	SW1/1	On
	Monitor type select monochrome	SW1/1	Off
»	Flash BIOS enabled	SW1/2	Off
	Flash BIOS disabled	SW1/2	On
»	CMOS memory normal operation	SW1/3	Off
	CMOS memory clear	SW1/3	On
»	Factory configured - do not alter	SW1/4	Unidentified

DRAM CONFIGURATION
Size	Bank 0	Bank 1
8MB	(2) 1M x 36	None
16MB	(2) 1M x 36	(2) 1M x 36
24MB	(2) 2M x 36	(2) 1M x 36
32MB	(2) 4M x 36	None
40MB	(2) 4M x 36	(2) 1M x 36
48MB	(2) 4M x 36	(2) 2M x 36
64MB	(2) 8M x 36	None
64MB	(2) 4M x 36	(2) 4M x 36
96MB	(2) 8M x 36	(2) 4M x 36
128MB	(2) 8M x 36	(2) 8M x 36
Note: Board also accepts x 32 SIMMs.

CACHE CONFIGURATION

Note: Bank 0 is factory installed and is not configurable. The location is unidentified.

CACHE JUMPER CONFIGURATION
Size	JP8	JP9	JP16
256KB	Pins 1 & 2 closed	Pins 2 & 3 closed	Pins 5 & 6 closed

CPU TYPE SELECTION
Type	JP3	JP5
80486SX	Pins 1 & 2 closed	Pins 2 & 3 closed
80486DX	Pins 2 & 3 closed	Pins 2 & 3 closed
80486DX2	Pins 2 & 3 closed	Pins 2 & 3 closed
80486DX4	Pins 2 & 3 closed	Pins 1 & 2 closed

CPU MULTIPLIER SELECTION (80486DX4 ONLY)
Multiplier		JP1
	2x	Pins 1 & 2 closed
	2.5x	Pins 2 & 3 closed
»	3x	Open

SERIAL PORT 2 SELECTION
Setting		JP18	JP21	JP22
»	RS232	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed
	RS422	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 1 & 2 closed
	RS485	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 1 & 2 closed