J-656C Motherboard Settings and Configuration

Processor	CX M1/Pentium
Processor Speed	75/90/100/120/133/150/166/180/200MHz
Chip Set	Intel
Video Chip Set	None
Maximum Onboard Memory	128MB (EDO supported)
Maximum Video Memory	None
Cache	256/512KB
BIOS	Award
Dimensions	255mm x 220mm
I/O Options	32-bit PCI slots (4), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse port, serial ports (2), cache slot
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
IDE interface 2	J1	IDE interface LED	JP6 pins 14 & 15
IDE interface 1	J2	Turbo switch	JP6 pins 18 & 19
Serial port 2	J7	Reset switch	JP6 pins 22 & 23
Serial port 1	J8	Turbo LED	JP6 pins 25 & 26
Floppy drive interface	J9	Parallel port	JP15
Power LED & keylock	JP6 pins 1 - 5	32-bit PCI slots	PC1 – PC4
Green PC connector	JP6 pins 7 & 8	PS/2 mouse interface	PS2
Speaker	JP6 pins 10 - 13	Cache slot	SL1

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Factory configured - do not alter	J5	Unidentified
»	CMOS memory normal operation	JP3	Open
	CMOS memory clear	JP3	Closed
	Flash BIOS voltage select 12v	JP5	Pins 1 & 2 closed
	Flash BIOS voltage select 5v	JP5	Pins 2 & 3 closed
»	ISA clock select PCI CLK/4	JP8	Pins 2 & 3 closed
	ISA clock select PCI CLK/3	JP8	Pins 1 & 2 closed
»	Factory configured - do not alter	JP13	Unidentified
»	Factory configured - do not alter	JV1	Unidentified
»	Factory configured - do not alter	JW1	Unidentified
»	Factory configured - do not alter	JW2	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
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 at 64MB and above.

CACHE CONFIGURATION
Size	Bank 0	SL1	TAG
256KB (A)	(2) 32K x 32	Not installed	(1) 32K x 8
256KB (B)	None	256KB module installed	(1) 32K x 8
512KB (A)	(2) 32K x 32	256KB module installed	(1) 32K x 8
512KB (B)	None	512KB module installed	(1) 32K x 8

CACHE JUMPER CONFIGURATION
Size	JC1	JC2	JT2	JX2
256KB (A)	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 1 & 2 closed	Pins 1 & 2 closed
256KB (B)	N/A	N/A	N/A	N/A
512KB (A)	Pins 2 & 3 closed	Pins 1 & 2 closed	Pins 2 & 3 closed	Pins 1 & 2 closed
512KB (B)	N/A	N/A	N/A	N/A

CACHE TYPE CONFIGURATION
Type	JP101
Asynchronous	Closed
Synchronous	Open

CPU SPEED SELECTION (CYRIX)
CPU speed	Clock speed	Multiplier	JF1	J1	J3
120MHz	50MHz	2x	3 & 4	Closed	Open
150MHz	60MHz	2x	1 & 2	Closed	Open
166MHz	66MHz	2x	Open	Closed	Open
Note: Pins designated should be in the closed position.

CPU SPEED SELECTION (INTEL)
CPU speed	Clock speed	Multiplier	JF1	J1	J3
75MHz	50MHz	1.5x	3 & 4	Open	Open
90MHz	60MHz	1.5x	1 & 2	Open	Open
100MHz	66MHz	1.5x	Open	Open	Open
120MHz	60MHz	2x	1 & 2	Closed	Open
133MHz	66MHz	2x	Open	Closed	Open
150MHz	60MHz	2.5x	1 & 2	Closed	Closed
166MHz	66MHz	2.5x	Open	Closed	Closed
180MHz	60MHz	3x	1 & 2	Open	Closed
200MHz	66MHz	3x	Open	Open	Closed
Note: Pins designated should be in the closed position.

CPU VOLTAGE SELECTION
Voltage		JV2
	3.3v	Pins 1 & 2 closed
»	3.45v	Pins 3 & 4 closed
	3.6v	Pins 5 & 6 closed

CPU CLOCK TOLERANCE SELECTION
Tolerance		JP7
	3.3v	Pins 2 & 3 closed
»	5v	Pins 1 & 2 closed