E486C Motherboard Settings and Configuration

Processor	80486DX/80486DX2/80486DX4
Processor Speed	25/33/50(internal)/50/66(internal)/100(internal)MHz
Chip Set	Unidentified
Video Chip Set	None
Maximum Onboard Memory	64MB
Maximum Video Memory	None
Cache	256KB
BIOS	Unidentified
Dimensions	355mm x 304mm
I/O Options	Auxiliary bus slots (6), CPU slot, floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2)
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Serial port 2	J1	PS/2 mouse port	J5
IDE interface	J2	Parallel port	J9
Serial port 1	J3	IDE interface LED	JP4
Floppy drive interface	J4

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Factory configured - do not alter	JP6	Pins 1 & 2, 3 & 4 closed
»	Counter timing select free running	JP9	Pins 2 & 3 closed
	Counter timing select CPU heartbeat (ADS)	JP9	Pins 1 & 2 closed
»	Factory configured - do not alter	JP11	Pins 2 & 3 closed
»	Factory configured - do not alter	JP12	Pins 2 & 3 closed
»	Factory configured - do not alter	JP14	Open
»	PS/2 mouse IRQ 12 unbuffered	JP15	Pins 1 & 2 closed
	PS/2 mouse IRQ 12 buffered	JP15	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
	I/O address select 270	SW1/4	Off
	I/O address select 370	SW1/4	On

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
1MB	(1) 256K x 36	None	None	None
2MB	(1) 256K x 36	(1) 256K x 36	None	None
3MB	(1) 256K x 36	(1) 256K x 36	(1) 256K x 36	None
4MB	(1) 256K x 36	(1) 256K x 36	(1) 256K x 36	(1) 256K x 36
4MB	(1) 1M x 36	None	None	None
8MB	(1) 1M x 36	(1) 1M x 36	None	None
10MB	(1) 1M x 36	(1) 1M x 36	(1) 256K x 36	(1) 256K x 36
12MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36	None
16MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36
16MB	(1) 4M x 36	None	None	None
32MB	(1) 4M x 36	(1) 4M x 36	None	None
32MB	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36	(1) 2M x 36
48MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	None
64MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36

CACHE CONFIGURATION

Note: 256KB cache is factory installed and is not configurable.

CPU SPEED SELECTION
Speed	JP5
25MHz	Pins 5 & 6, 7 & 8 closed
33MHz	Pins 5 & 6 closed
50iMHz	Pins 5 & 6, 7 & 8 closed
50MHz	Pins 1 & 2, 5 & 6 closed
66iMHz	Pins 5 & 6 closed
100iMHz	Pins 5 & 6 closed

CPU TYPE SELECTION
Type	JP17
80486DX	Pins 2 & 3 closed
80486DX2	Pins 2 & 3 closed
80486DX4	Pins 1 & 2 closed

CPU MULTIPLIER SELECTION
Multiplier	JP18
2x	Pins 1 & 2 closed
3x	Pins 2 & 3 closed

SERIAL PORT 2 SELECTION
Setting		JP1	JP2	JP3
»	RS-232	Pins 2 & 3 closed	Pins 2 & 3 closed	Pins 2 & 3 closed
	RS-422	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 1 & 2 closed
	RS-485	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 1 & 2 closed

BUS CLOCK BUFFER SELECTION
Setting	JP7	JP16
Unbuffered	Pins 1 & 2 closed	Pins 1 & 2 closed
Buffered	Pins 2 & 3 closed	Pins 2 & 3 closed

CONNECTIONS
Purpose	Location	Purpose	Location
DC power	J20	Front keyboard connector	JP15
DC power	J21	CPU slot	SL1
Rear keyboard connector	JP14	Auxiliary bus slots	SL2 – SL6

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Slot 7 card type select EISA	JP1	Pins 2 & 3 closed
	Slot 7 card type select ISA	JP1	Pins 1 & 2 closed
»	Slot 5 card type select EISA	JP2	Pins 2 & 3 closed
	Slot 5 card type select ISA	JP2	Pins 1 & 2 closed
»	Slot 3 card type select EISA	JP3	Pins 2 & 3 closed
	Slot 3 card type select ISA	JP3	Pins 1 & 2 closed
»	Slot 1 card type select EISA	JP4	Pins 2 & 3 closed
	Slot 1 card type select ISA	JP4	Pins 1 & 2 closed
»	Slot 9 card type select EISA	JP5	Pins 2 & 3 closed
	Slot 9 card type select ISA	JP5	Pins 1 & 2 closed
»	Slot 11 card type select EISA	JP6	Pins 2 & 3 closed
	Slot 11 card type select ISA	JP6	Pins 1 & 2 closed
»	Slot 13 card type select EISA	JP7	Pins 2 & 3 closed
	Slot 13 card type select ISA	JP7	Pins 1 & 2 closed
»	Slot 6 card type select EISA	JP8	Pins 2 & 3 closed
	Slot 6 card type select ISA	JP8	Pins 1 & 2 closed
»	Slot 4 card type select EISA	JP9	Pins 2 & 3 closed
	Slot 4 card type select ISA	JP9	Pins 1 & 2 closed
»	Slot 2 card type select EISA	JP10	Pins 2 & 3 closed
	Slot 2 card type select ISA	JP10	Pins 1 & 2 closed
»	Slot 8 card type select EISA	JP11	Pins 2 & 3 closed
	Slot 8 card type select ISA	JP11	Pins 1 & 2 closed
»	Slot 10 card type select EISA	JP12	Pins 2 & 3 closed
	Slot 10 card type select ISA	JP12	Pins 1 & 2 closed
»	Slot 12 card type select EISA	JP13	Pins 2 & 3 closed
	Slot 12 card type select ISA	JP13	Pins 1 & 2 closed
Note: Slot 1 is located at the top of the diagram.