J-656B Motherboard Settings and Configuration

Processor	Pentium
Processor Speed	75/90/100/120/133/150/180/200MHz
Chip Set	Intel
Video Chip Set	None
Maximum Onboard Memory	128MB (EDO supported)
Maximum Video Memory	None
Cache	256/512KB
BIOS	Award
Dimensions	330mm x 218mm
I/O Options	32-bit PCI slots (4), floppy drive interface, IDE interfaces (2), parallel port, PS/2 mouse interface, serial ports (2), VRM connector. IR connector
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Serial port 2	CN1	Speaker	J4
Serial port 1	CN2	Power LED & keylock	J5
Parallel port	CN3	Turbo LED	J6
Floppy drive interface	CN4	Turbo switch	J7
IDE interface 2	CN5	IR connector	JP8
IDE interface 1	CN6	PS/2 mouse interface	MS1
Reset switch	J2	32-bit PCI slots	PC1 – PC4
IDE interface LED	J3	VRM connector	VRM

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Factory configured - do not alter	J8	Unidentified
»	Factory configured - do not alter	J9	Unidentified
»	PCI CLK select CLK/4	JP3	Pins 2 & 3 closed
	PCI CLK select CLK/3	JP3	Pins 1 & 2 closed
»	I/O address select 250 HEX	JP4	Pins 2 & 3 closed
	I/O address select 3F0 HEX	JP4	Pins 1 & 2 closed
»	IDE interface 1 IRQ select IRQ14	JP5	Pins 1 & 2 closed
	IDE interface 1 IRQ select MIRQ1	JP5	Pins 2 & 3 closed
»	IDE interface 2 IRQ select IRQ15	JP6	Pins 1 & 2 closed
	IDE interface 2 IRQ select MIRQ0	JP6	Pins 2 & 3 closed
»	Factory configured - do not alter	JP9	Unidentified
»	Green PC disabled	JP10	Open
	Green PC enabled	JP10	Closed
»	Factory configured - do not alter	JP13	Unidentified
»	Factory configured - do not alter	JP15	Unidentified
»	Factory configured - do not alter	JP16	Unidentified
»	CMOS memory normal operation	JP17	Open
	CMOS memory clear	JP17	Closed
»	CPU type select write back	JP18	Open
	CPU type select write through	JP18	Closed
»	CPU pipeline enabled	JP19	Closed
	CPU pipeline disabled	JP19	Open
»	Factory configured - do not alter	JP20	Unidentified
»	Factory configured - do not alter	JP24	Unidentified
»	Factory configured - do not alter	JP32	Unidentified

DRAM CONFIGURATION
Size	Bank 0	Bank 1
8MB	(2) 1M x 36	None
16MB	(2) 2M x 36	None
16MB	(2) 1M x 36	(2) 1M x 36
24MB	(2) 2M x 36	(2) 1M x 36

DRAM CONFIGURATION (CON’T)
Size	Bank 0	Bank 1
32MB	(2) 4M x 36	None
32MB	(2) 2M x 36	(2) 2M x 36
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
72MB	(2) 8M x 36	(2) 1M x 36
80MB	(2) 8M x 36	(2) 2M x 36
96MB	(2) 8M x 36	(2) 4M x 36
128MB	(2) 8M x 36	(2) 8M x 36
Note: Board accepts EDO memory. Board also accepts x 32 SIMMs. Banks are interchangeable.

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG
256KB (A)	(2) 32K x 32	None	(1) 8K x 8
256KB (B)	None	(8) 32K x 8	(1) 8K x 8
512KB (A)	(2) 64K x 32	None	(1) 16K/32K x 8
512KB (B)	None	(8) 64K x 8	(1) 16K/32K x 8

CACHE JUMPER CONFIGURATION
Size	JP14
256KB (A)	Pins 1 & 2 closed
256KB (B)	Pins 1 & 2 closed
512KB (A)	Pins 2 & 3 closed
512KB (B)	Pins 2 & 3 closed

CACHE VOLTAGE CONFIGURATION
Voltage	JP1	JP2
3v synchronous	Open	Pins 1 & 2, 3 & 4, 5 & 6 closed
3v asynchronous	Open	Pins 1 & 2, 3 & 4, 5 & 6 closed
5v mixed asynchronous	Pins 1 & 2, 3 & 4, 5 & 6 closed	Open

CPU SPEED SELECTION
CPU speed	Clock speed	Multiplier	JP11	JP12	JP26	JP27
75MHz	50MHz	1.5x	Open	Open	Open	Open
90MHz	60MHz	1.5x	Open	Closed	Open	Open
100MHz	66MHz	1.5x	Closed	Closed	Open	Open
120MHz	60MHz	2x	Open	Closed	Open	Closed
133MHz	66MHz	2x	Closed	Closed	Open	Closed
150MHz	60MHz	2.5x	Open	Closed	Closed	Closed
180MHz	60MHz	3x	Open	Closed	Closed	Open
200MHz	66MHz	3x	Closed	Closed	Closed	Open

CPU VOLTAGE SELECTION
Voltage	JP28	JP29	JP30
3.3v	Closed	Open	Open
3.45v	Open	Closed	Open
3.6v	Open	Open	Closed

BIOS SELECTION
Setting		JP21	JP31
	EPROM	Pins 1 & 2 closed	Pins 2 & 3 closed
»	12v flash	Pins 2 & 3 closed	Pins 1 & 2 closed
	5v flash	Pins 2 & 3 closed	Pins 2 & 3 closed