D486 (REL. 2) Motherboard Settings and Configuration

Processor	80486DX/80486DX2/80486DX4
Processor Speed	33/50/66(internal)/100(internal)MHz
Chip Set	Unidentified
Video Chip Set	None
Maximum Onboard Memory	128MB
Maximum Video Memory	None
Cache	64/128/256KB
BIOS	Unidentified
Dimensions	Unidentified
I/O Options	Floppy drive interface, IDE interface, parallel port, serial ports (2)
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
IDE interface	CN1	Parallel port	CN5
Floppy drive interface	CN2	AT keyboard connector	CN6
Serial port 2	CN3	External battery	JP9
Serial port 1	CN4	IDE interface LED	JP10

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Battery type select internal	JP9	Pins 1 & 2 closed
	Battery type select external	JP9	Closed
»	Watchdog timer disabled	JP11	Pins 2 & 3 closed
	Watchdog timer enabled	JP11	Pins 1 & 2 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
»	I/O address select 270H	SW1/4	Off
	I/O address select 370H	SW1/4	On

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: The chip sizes and location of the cache is unidentified.

CACHE JUMPER CONFIGURATION
Size	JP5	JP6	JP7	JP8
64KB	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 1 & 2 closed	Open
128KB	Pins 2 & 3 closed	Pins 1 & 2 closed	Pins 2 & 3 closed	Pins 1 & 2 closed
256KB	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 1 & 2 closed	Pins 2 & 3 closed

CPU SPEED SELECTION
Speed	JP4
33MHz	Pins 1 & 2 closed

CPU TYPE SELECTION
Type	JP1	JP2	JP3	JP14
80486DX	Pins 1 & 2 closed	Pins 2 & 3 closed	Pins 1 & 2 closed	Pins 2 & 3 closed
80486DX2	Pins 1 & 2 closed	Pins 2 & 3 closed	Pins 1 & 2 closed	Pins 2 & 3 closed
80486DX4	Pins 1 & 2 closed	Pins 2 & 3 closed	Pins 1 & 2 closed	Pins 1 & 2 closed

CPU MULTIPLIER SELECTION (80486DX4 ONLY)
Multiplier	JP13
2x	Pins 2 & 3 closed
3x	Pins 1 & 2 closed

WATCHDOG TIMER SELECTION
Timer		JP12
»	150ms	Pins 2 & 3 closed
	600ms	Open
	1.2 seconds	Pins 1 & 2 closed