J-648AP Motherboard Settings and Configuration

J-MARK COMPUTER CORPORATION

J-648AP

Processor
CX M1/IBM 6X86/AM K5/Pentium
Processor Speed
75/90/100/120/133/150/166/200MHz
Chip Set
SIS
Video Chip Set
None
Maximum Onboard Memory
512MB (EDO supported)
Maximum Video Memory
None
Cache
256/512KB
BIOS
Award
Dimensions
250mm x 220mm
I/O Options
32-bit PCI slots (3), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse interface, serial ports (2), VGA feature connector, VGA interface, IR connector
NPU Options
None

CONNECTIONS
Purpose
Location
Purpose
Location
Chassis fan power
CN1
Parallel port
J6
Speaker
CN2
Serial port 2
J7
Reset switch
CN3
Floppy drive interface
J8
Turbo LED
CN4
IR connector
J9
Turbo switch
CN5
VGA feature connector
J10
IDE interface LED
CN6
VGA interface
J11
Green PC connector
CN7
IDE interface 2
J14
Power LED & keylock
CN8
IDE interface 1
J15
PS/2 mouse interface
J1
32-bit PCI slots
PC1 – PC3
Serial port 1
J2

USER CONFIGURABLE SETTINGS
Function
Label
Position
»
CMOS memory normal operation
J18
Pins 2 & 3 closed

CMOS memory clear
J18
Pins 3 & 4 closed

Flash BIOS voltage select 12v
JP5
Pins 1 & 2 closed

Flash BIOS voltage select 5v
JP5
Pins 2 & 3 closed
»
Factory configured - do not alter
JP10
Unidentified
»
Factory configured - do not alter
JP18
Unidentified
»
Factory configured - do not alter
JP25
Unidentified

Monitor type select color
JP29
Closed

Monitor type select monochrome
JP29
Open

PS/2 mouse IRQ12 enabled
JP48
Closed

PS/2 mouse IRQ12 disabled
JP48
Open

DRAM CONFIGURATION
Size
Bank 0
Bank 1
4MB
(2) 512K x 36
None
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

DRAM CONFIGURATION (CON’T)
Size
Bank 0
Bank 1
128MB
(2) 8M x 36
(2) 8M x 36
128MB
(2) 16M x 36
None
136MB
(2) 16M x 36
(2) 1M x 36
144MB
(2) 16M x 36
(2) 2M x 36
160MB
(2) 16M x 36
(2) 4M x 36
192MB
(2) 16M x 36
(2) 8M x 36
256MB
(2) 32M x 36
None
256MB
(2) 16M x 36
(2) 16M x 36
264MB
(2) 32M x 36
(2) 1M x 36
272MB
(2) 32M x 36
(2) 2M x 36
288MB
(2) 32M x 36
(2) 4M x 36
320MB
(2) 32M x 36
(2) 8M x 36
384MB
(2) 32M x 36
(2) 16M x 36
512MB
(2) 32M x 36
(2) 32M x 36
Note: Board accepts EDO memory.

CACHE CONFIGURATION
Size
Bank 0
TAG
256KB
(2) 32K x 32
(1) 32K x 8
512KB
(2) 64K x 32
(1) 32K x 8

CACHE JUMPER CONFIGURATION
Size
JP3
256KB
Open
512KB
Closed

CPU SPEED SELECTION (CYRIX)
CPU speed
Clock speed
Multiplier
JP4
JP9
JP11
JP26
120MHz
50MHz
2x
Closed
Open
Closed
1 & 2, 3 & 4
133MHz
66MHz
2x
Closed
Open
Closed
Open
150MHz
60MHz
2x
Closed
Open
Closed
1 & 2
166MHz
66MHz
2x
Closed
Open
Closed
3 & 4
Note: Pins designated should be in the closed position.

CPU SPEED SELECTION (IBM)
CPU speed
Clock speed
Multiplier
JP4
JP9
JP11
JP26
133MHz
55MHz
2x
Closed
Open
Closed
Open
150MHz
60MHz
2x
Closed
Open
Closed
1 & 2
166MHz
66MHz
2x
Closed
Open
Closed
3 & 4
Note: Pins designated should be in the closed position.

CPU SPEED SELECTION (AMD)
CPU speed
Clock speed
Multiplier
JP4
JP9
JP11
JP26
90MHz
60MHz
1.5x
Open
Open
Open
1 & 2
100MHz
66MHz
2x
Open
Open
Open
3 & 4
133MHz
66MHz
2x
Open
Open
Open
3 & 4
Note: Pins designated should be in the closed position.

CPU SPEED SELECTION (INTEL)
CPU speed
Clock speed
Multiplier
JP4
JP9
JP11
JP26
75MHz
50MHz
1.5x
Open
Open
Open
1 & 2, 3 & 4
90MHz
60MHz
1.5x
Open
Open
Open
1 & 2
100MHz
66MHz
1.5x
Open
Open
Open
3 & 4
120MHz
60MHz
2x
Open
Open
Closed
1 & 2
133MHz
66MHz
2x
Open
Open
Closed
3 & 4
150MHz
60MHz
2.5x
Open
Closed
Closed
1 & 2
166MHz
66MHz
2.5x
Open
Closed
Closed
3 & 4
200MHz
66MHz
3x
Open
Closed
Open
3 & 4
Note: Pins designated should be in the closed position.

CPU VOLTAGE SELECTION
Voltage
V core
JP16
JP17
3.3v
2.8v
Pins 1 & 2 closed
Pins 1 & 2 closed
3.3v
3.45v
Pins 3 & 4 closed
Pins 1 & 2 closed
3.3v
3.52v
Pins 5 & 6 closed
Pins 1 & 2 closed
3.45v
2.8v
Pins 1 & 2 closed
Pins 3 & 4 closed
3.45v
3.45v
Pins 3 & 4 closed
Pins 3 & 4 closed
3.45v
3.52v
Pins 5 & 6 closed
Pins 3 & 4 closed
3.52v
2.8v
Pins 1 & 2 closed
Pins 5 & 6 closed
3.52v
3.45v
Pins 3 & 4 closed
Pins 5 & 6 closed
3.52v
3.52v
Pins 5 & 6 closed
Pins 5 & 6 closed

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J-648AP Motherboard Settings and Configuration

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Processor	CX M1/IBM 6X86/AM K5/Pentium
Processor Speed	75/90/100/120/133/150/166/200MHz
Chip Set	SIS
Video Chip Set	None
Maximum Onboard Memory	512MB (EDO supported)
Maximum Video Memory	None
Cache	256/512KB
BIOS	Award
Dimensions	250mm x 220mm
I/O Options	32-bit PCI slots (3), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse interface, serial ports (2), VGA feature connector, VGA interface, IR connector
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Chassis fan power	CN1	Parallel port	J6
Speaker	CN2	Serial port 2	J7
Reset switch	CN3	Floppy drive interface	J8
Turbo LED	CN4	IR connector	J9
Turbo switch	CN5	VGA feature connector	J10
IDE interface LED	CN6	VGA interface	J11
Green PC connector	CN7	IDE interface 2	J14
Power LED & keylock	CN8	IDE interface 1	J15
PS/2 mouse interface	J1	32-bit PCI slots	PC1 – PC3
Serial port 1	J2

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	CMOS memory normal operation	J18	Pins 2 & 3 closed
	CMOS memory clear	J18	Pins 3 & 4 closed
	Flash BIOS voltage select 12v	JP5	Pins 1 & 2 closed
	Flash BIOS voltage select 5v	JP5	Pins 2 & 3 closed
»	Factory configured - do not alter	JP10	Unidentified
»	Factory configured - do not alter	JP18	Unidentified
»	Factory configured - do not alter	JP25	Unidentified
	Monitor type select color	JP29	Closed
	Monitor type select monochrome	JP29	Open
	PS/2 mouse IRQ12 enabled	JP48	Closed
	PS/2 mouse IRQ12 disabled	JP48	Open

DRAM CONFIGURATION
Size	Bank 0	Bank 1
4MB	(2) 512K x 36	None
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

DRAM CONFIGURATION (CON’T)
Size	Bank 0	Bank 1
128MB	(2) 8M x 36	(2) 8M x 36
128MB	(2) 16M x 36	None
136MB	(2) 16M x 36	(2) 1M x 36
144MB	(2) 16M x 36	(2) 2M x 36
160MB	(2) 16M x 36	(2) 4M x 36
192MB	(2) 16M x 36	(2) 8M x 36
256MB	(2) 32M x 36	None
256MB	(2) 16M x 36	(2) 16M x 36
264MB	(2) 32M x 36	(2) 1M x 36
272MB	(2) 32M x 36	(2) 2M x 36
288MB	(2) 32M x 36	(2) 4M x 36
320MB	(2) 32M x 36	(2) 8M x 36
384MB	(2) 32M x 36	(2) 16M x 36
512MB	(2) 32M x 36	(2) 32M x 36
Note: Board accepts EDO memory.

CACHE CONFIGURATION
Size	Bank 0	TAG
256KB	(2) 32K x 32	(1) 32K x 8
512KB	(2) 64K x 32	(1) 32K x 8

CACHE JUMPER CONFIGURATION
Size	JP3
256KB	Open
512KB	Closed

CPU SPEED SELECTION (CYRIX)
CPU speed	Clock speed	Multiplier	JP4	JP9	JP11	JP26
120MHz	50MHz	2x	Closed	Open	Closed	1 & 2, 3 & 4
133MHz	66MHz	2x	Closed	Open	Closed	Open
150MHz	60MHz	2x	Closed	Open	Closed	1 & 2
166MHz	66MHz	2x	Closed	Open	Closed	3 & 4
Note: Pins designated should be in the closed position.

CPU SPEED SELECTION (IBM)
CPU speed	Clock speed	Multiplier	JP4	JP9	JP11	JP26
133MHz	55MHz	2x	Closed	Open	Closed	Open
150MHz	60MHz	2x	Closed	Open	Closed	1 & 2
166MHz	66MHz	2x	Closed	Open	Closed	3 & 4
Note: Pins designated should be in the closed position.

CPU SPEED SELECTION (AMD)
CPU speed	Clock speed	Multiplier	JP4	JP9	JP11	JP26
90MHz	60MHz	1.5x	Open	Open	Open	1 & 2
100MHz	66MHz	2x	Open	Open	Open	3 & 4
133MHz	66MHz	2x	Open	Open	Open	3 & 4
Note: Pins designated should be in the closed position.

CPU SPEED SELECTION (INTEL)
CPU speed	Clock speed	Multiplier	JP4	JP9	JP11	JP26
75MHz	50MHz	1.5x	Open	Open	Open	1 & 2, 3 & 4
90MHz	60MHz	1.5x	Open	Open	Open	1 & 2
100MHz	66MHz	1.5x	Open	Open	Open	3 & 4
120MHz	60MHz	2x	Open	Open	Closed	1 & 2
133MHz	66MHz	2x	Open	Open	Closed	3 & 4
150MHz	60MHz	2.5x	Open	Closed	Closed	1 & 2
166MHz	66MHz	2.5x	Open	Closed	Closed	3 & 4
200MHz	66MHz	3x	Open	Closed	Open	3 & 4
Note: Pins designated should be in the closed position.

CPU VOLTAGE SELECTION
Voltage	V core	JP16	JP17
3.3v	2.8v	Pins 1 & 2 closed	Pins 1 & 2 closed
3.3v	3.45v	Pins 3 & 4 closed	Pins 1 & 2 closed
3.3v	3.52v	Pins 5 & 6 closed	Pins 1 & 2 closed
3.45v	2.8v	Pins 1 & 2 closed	Pins 3 & 4 closed
3.45v	3.45v	Pins 3 & 4 closed	Pins 3 & 4 closed
3.45v	3.52v	Pins 5 & 6 closed	Pins 3 & 4 closed
3.52v	2.8v	Pins 1 & 2 closed	Pins 5 & 6 closed
3.52v	3.45v	Pins 3 & 4 closed	Pins 5 & 6 closed
3.52v	3.52v	Pins 5 & 6 closed	Pins 5 & 6 closed