J-646B Motherboard Settings and Configuration

Processor	Pentium
Processor Speed	75/90/100/120/133/150/166MHz
Chip Set	SIS
Video Chip Set	None
Maximum Onboard Memory	128MB (EDO supported)
Maximum Video Memory	None
Cache	256/512/1024KB
BIOS	Award
Dimensions	330mm x 218mm
I/O Options	32-bit PCI slots (3), floppy drive interface, IDE interfaces (2), parallel port, PS/2 mouse interface, serial ports (2)
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Speaker	CN1	Serial port 2	J8
Reset switch	CN2	Serial port 1	J9
Turbo LED	CN3	Parallel port	J10
Power LED & keylock	CN4	Floppy drive interface	J11
Turbo switch	CN5	IDE interface 1	J12
IDE interface LED	CN6	IDE interface 2	J13
BK LED	CN7	External battery	J15
PS/2 mouse interface	J2	32-bit PCI slots	PC1 – PC3
VGA feature connector	J7

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Factory configured - do not alter	J6	Unidentified
»	Factory configured - do not alter	JP4	Unidentified
»	Factory configured - do not alter	JP5	Unidentified
»	Factory configured - do not alter	JP6	Unidentified
»	Factory configured - do not alter	JP7	Unidentified
»	Factory configured - do not alter	JP9	Open
»	Factory configured - do not alter	JP15	Unidentified
»	CPU write select write back	JP16	Pins 1 & 2 closed
	CPU write select write through	JP16	Pins 2 & 3 closed
»	CPU pipeline enabled	JP17	Pins 2 & 3 closed
	CPU pipeline disabled	JP17	Pins 1 & 2 closed
»	Suspend mode disabled	JP20	Open
	Suspend mode enabled	JP20	Closed
»	Break switch for suspend mode	JP24	Pins 2 & 3 closed
	8042 RC enabled	JP24	Pins 1 & 2 closed
»	Monitor type select monochrome	JP25	Open
	Monitor type select color	JP25	Closed
»	Factory configured - do not alter	JP26	Unidentified
»	Factory configured - do not alter	JP27	Unidentified
»	Factory configured - do not alter	JP28	Unidentified
»	Factory configured - do not alter	JP29	Unidentified
»	Factory configured - do not alter	JP30	Unidentified
»	Factory configured - do not alter	JP31	Unidentified
»	Factory configured - do not alter	JP32	Unidentified
»	Factory configured - do not alter	JP33	Unidentified
»	Factory configured - do not alter	JP34	Unidentified
»	Factory configured - do not alter	JP35	Unidentified
»	Factory configured - do not alter	JP36	Unidentified
»	Factory configured - do not alter	JP37	Unidentified

USER CONFIGURABLE SETTINGS (CON’T)
Function		Label	Position
»	CMOS memory normal operation	JP38	Pins 1 & 2 closed
	CMOS memory clear	JP38	Pins 2 & 3 closed
»	PCICLK speed select 1/2 CPU CLK	JP39	Closed
	PCICLK speed select = 32MHz	JP39	Open
»	PS/2 IRQ12 enabled	JP41	Closed
	PS/2 IRQ12 disabled	JP41	Open
»	Factory configured - do not alter	JP42	Unidentified

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
4MB	(1) 1M x 36	None	None	None
8MB	(1) 2M x 36	None	None	None
8MB	(1) 1M x 36	(1) 1M x 36	None	None
16MB	(1) 4M x 36	None	None	None
16MB	(1) 2M x 36	(1) 2M x 36	None	None
16MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36
24MB	(1) 1M x 36	(1) 1M x 36	(1) 2M x 36	(1) 2M x 36
32MB	(1) 8M 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
40MB	(1) 4M x 36	(1) 4M x 36	(1) 1M x 36	(1) 1M x 36
48MB	(1) 4M x 36	(1) 4M x 36	(1) 2M x 36	(1) 2M x 36
64MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36
72MB	(1) 8M x 36	(1) 8M x 36	(1) 1M x 36	(1) 1M x 36
80MB	(1) 8M x 36	(1) 8M x 36	(1) 2M x 36	(1) 2M x 36
96MB	(1) 8M x 36	(1) 8M x 36	(1) 4M x 36	(1) 4M x 36
128MB	(1) 8M x 36	(1) 8M x 36	(1) 8M x 36	(1) 8M x 36
Note: Board accepts EDO memory. Board also accepts x 32 SIMMs.

DRAM VOLTAGE CONFIGURATION
Voltage		JP1
»	Mixed mode	Pins 3 & 5, 4 & 6 closed
	3.3v	Pins 1 & 3, 2 & 4 closed

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG
256KB (A)	None	(8) 32K x 8	(1) 8K x 8
256KB (B)	(2) 32K x 32	None	Unidentified
512KB (A)	None	(8) 64K x 8	(1) 16K x 8 (Windbond)
512KB (B)	None	(8) 64K x 8	(1) 16K/32K x 8 (Aster)
1MB	None	(8) 128K x 8	(1) 32K x 8
Note: The location of bank 1 & TAG are unidentified.

CACHE JUMPER CONFIGURATION
Size	JP3	JP11	JP42
256KB (A)	Pins 1 & 2 closed	Pins 1 & 2 closed	Open
256KB (B)	Pins 1 & 2 closed	Pins 1 & 2 closed	Open
512KB (A)	Pins 2 & 3 closed	Open	Closed
512KB (B)	Pins 2 & 3 closed	Pins 1 & 2 closed	Open
1MB	Pins 2 & 3 closed	Pins 2 & 3 closed	Open

CPU SPEED SELECTION
CPU speed	Clock speed	Multiplier	JP12	JP13	JP18	JP19
75MHz	50MHz	1.5x	Closed	Closed	Open	Open
90MHz	60MHz	1.5x	Closed	Open	Open	Open
100MHz	66MHz	1.5x	Open	Closed	Open	Open
120MHz	60MHz	2x	Closed	Open	Open	Closed
133MHz	66MHz	2x	Open	Closed	Open	Closed
150MHz	60MHz	2.5x	Closed	Open	Closed	Closed
166MHz	66MHz	2.5x	Open	Closed	Closed	Closed

CPU VOLTAGE SELECTION
Voltage		JP21	JP22	JP23
	3.3v	Closed	Open	Open
»	3.45v	Open	Closed	Open
	3.6v	Open	Open	Closed

VGA SELECTION
Setting		JP2	JP8	JP10
»	Onboard VGA	Pins 1 & 2 closed	Closed	Closed
	External VGA card	Pins 2 & 3 closed	Open	Open