B860/B860 (REV. A) Motherboard Settings and Configuration

Processor	CX486SX/80486SX/80486DX/80486DX2/Pentium Overdrive
Processor Speed	25/33/40/50(internal)/50/66(internal)MHz
Chip Set	Unidentified
Max. Onboard DRAM	32/128MB (depends on board revision)
Cache	128/256KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	32-bit VESA local bus slots (2)
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Power LED & keylock	JP6 pins 1 - 5	Reset switch	JP6 pins 19 - 20
Speaker	JP6 pins 6 - 9	External battery	JP17
Turbo LED	JP6 pins 11 - 12	Auxiliary keyboard connector	JP35
Turbo switch	JP6 pins 16 - 17	32-bit VESA local bus slots	SL1 & SL2

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	PQFP CPU disabled	JP1	Closed
	PQFP CPU enabled	JP1	Open
»	CMOS memory normal operation	JP16	pins 1 & 2 closed
	CMOS memory clear	JP16	pins 2 & 3 closed
»	Battery type select 4.5v	JP34	Closed
	Battery type select 6.0v	JP34	Open
»	CPU speed select 20/25MHz	JP72	Closed
	CPU speed select => 33MHz	JP72	Open
»	VESA card select normal	JP89	Closed
	VESA card select Weitek VESA card only	JP89	Open

DRAM CONFIGURATION (REV. 0)
Size	Bank 0	Bank 1
2MB	(4) 256K x 9	(4) 256K x 9
5MB	(4) 256K x 9	(4) 1M x 9
8MB	(4) 1M x 9	(4) 1M x 9
17MB	(4) 256K x 9	(4) 4M x 9
20MB	(4) 1M x 9	(4) 4M x 9
32MB	(4) 4M x 9	(4) 4M x 9

DRAM CONFIGURATION (REV. A)
Size	Bank 0	Bank 1
2MB	(4) 256K x 9	(4) 256K x 9
5MB	(4) 256K x 9	(4) 1M x 9
8MB	(4) 1M x 9	(4) 1M x 9
17MB	(4) 256K x 9	(4) 4M x 9
20MB	(4) 1M x 9	(4) 4M x 9
32MB	(4) 4M x 9	(4) 4M x 9
65MB	(4) 256K x 9	(4) 16M x 9
68MB	(4) 1M x 9	(4) 16M x 9
80MB	(4) 4M x 9	(4) 16M x 9
128MB	(4) 16M x 9	(4) 16M x 9

DRAM JUMPER CONFIGURATION
Revision	JP76	JP77	JP90	JP91	JP92	JP93
Rev. 0	1 & 2	2 & 3	Open	Open	Open	2 & 3
Rev. A	2 & 3	1 & 2	Closed	Closed	Closed	1 & 2, 3 & 4
Note: Pins designated should be in the closed position.

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG
128KB	(4) 32K x 8	NONE	(1) 8K x 8
256KB	(4) 32K x 8	(4) 32K x 8	(1) 32K x 8

CACHE JUMPER CONFIGURATION
Size	JP7	JP8
128KB	pins 1 & 2 closed	pins 2 & 3 closed
256KB	pins 1 & 2 closed	pins 1 & 2 closed

CPU TYPE CONFIGURATION
Type	JP2	JP3	JP4	JP5	JP9
CX486SX	2 & 3	Open	Open	2 & 4	2 & 3
80486SX (PQFP)	Open	Open	Open	3 & 5	2 & 3
80486SX (PGA)	2 & 3	Open	Open	2 & 3	2 & 3
80486DX	1 & 2, 3 & 4	2 & 3	Open	2 & 3	2 & 3
80486DX2	1 & 2, 3 & 4	2 & 3	Open	2 & 3	2 & 3
Pentium Overdrive	1 & 2, 3 & 4	1 & 2	Closed	2 & 3	2 & 3
Note: Pins designated should be in the closed position.

CPU SPEED CONFIGURATION
Speed	JP33	JP36
25MHz	pins 2 & 3 closed	pins 2 & 6, 4 & 8 closed
33MHz	pins 2 & 3 closed	pins 3 & 7, 4 & 8 closed
40MHz	pins 2 & 3 closed	pins 2 & 6 closed
50iMHz	pins 2 & 3 closed	pins 2 & 6, 4 & 8 closed
50MHz	pins 1 & 2 closed	pins 3 & 7 closed
66iMHz	pins 2 & 3 closed	pins 3 & 7, 4 & 8 closed

VESA WAIT STATE CONFIGURATION
Wait states	ID2
0 wait states	Open
1 wait state	Closed

BUS SPEED CONFIGURATION
CPU speed	ID3
<= 33MHz	Open
> 33MHz	Closed

PAL JUMPER CONFIGURATION
Revision	JP96	TP1	TP2	TP3	TP4
Rev. 0	Open	2 & 3	2 & 3	2 & 3	2 & 3
Rev. A	Closed	1 & 2	1 & 2	1 & 2	1 & 2
Note: Pins designated should be in the closed position.

BOARD REVISION JUMPER CONFIGURATION
Revision	JP78	JP79	JP97	JP98
Rev. 0	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed
Rev. A	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed
Note: These jumpers configure the board revision.