MB-8500TAC-A (VER. 4) Motherboard Settings and Configuration

Processor	CX M1/AM K5/Pentium
Processor Speed	66/75/90/100/120/133/150/166/180/200MHz
Chip Set	Unidentified
Video Chip Set	None
Maximum Onboard Memory	128MB (EDO supported)
Maximum Video Memory	None
Cache	256/512KB
BIOS	AMI
Dimensions	275mm x 220mm
I/O Options	32-bit PCI slots (3), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse port, PS/2 mouse interface, serial ports (2), IR connectors (2)
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Serial port 1	CN1	Green PC connector	J8 pins 17 & 18
Parallel port	CN2	IDE interface LED	J8 pins 20 & 21
Serial port 2	CN3	VCC ground connector	J8 pins 25 & 26
Floppy drive interface	CN4	PS/2 mouse port	J11
IDE interface 2	CN5	IR connector	J12
IDE interface 1	CN6	IR connector	J12A
Speaker	J8 pins 1 - 4	PS/2 mouse interface	J13
Power LED & keylock	J8 pins 5 - 9	Chassis fan power	JP19
Turbo LED	J8 pins 10 & 11	32-bit PCI slots	PC1 - PC3
Reset switch	J8 pins 12 & 13

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Factory configured - do not alter	JP2	Unidentified
»	CMOS memory normal operation	JP4	Open
	CMOS memory clear	JP4	Closed
	Flash BIOS voltage select 12v	JP5	Pins 2 & 3 closed
	Flash BIOS voltage select 5v	JP5	Pins 1 & 2 closed
	BIOS type select EPROM	JP5	Open
	Secondary IDE IRQ select IRQ15	JP8	Pins 1 & 2 closed
	Secondary IDE IRQ select IRQ through PCI	JP8	Pins 2 & 3 closed
	Primary IDE IRQ14 enabled	JP9	Closed
	Primary IDE IRQ14 disabled	JP9	Open
»	Factory configured - do not alter	JP12	Unidentified
»	Factory configured - do not alter	JP13	Unidentified
»	Factory configured - do not alter	JP22	Pins 2 & 3 closed
»	Factory configured - do not alter	JP30	Pins 1 & 2 closed
»	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) 1M x 36	(2) 2M x 36
32MB	(2) 4M x 36	None
32MB	(2) 2M x 36	(2) 2M x 36
40MB	(2) 1M x 36	(2) 4M x 36
48MB	(2) 2M x 36	(2) 4M x 36
64MB	(2) 8M x 36	None
64MB	(2) 4M x 36	(2) 4M x 36

DRAM CONFIGURATION (CON’T)
Size	Bank 0	Bank 1
72MB	(2) 1M x 36	(2) 8M x 36
80MB	(2) 2M x 36	(2) 8M x 36
96MB	(2) 4M x 36	(2) 8M x 36
128MB	(2) 8M x 36	(2) 8M x 36
Note: Board accepts EDO memory.

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG
256KB (A)	None	(2) 32K x 32	None
256KB (B)	(8) 32K x 8	None	(1) 8K x 8
512KB (A)	(8) 64K x 8	None	(1) 16K/32K x 8
512KB (B)	(8) 64K x 8	None	(1) 16K x 8
Note: Board will either have asynchronous or synchronous cache installed.

CACHE JUMPER CONFIGURATION
Size	JP10
None	Open
256KB (B) (STD/Aster TAG)	Open
512KB (A) (STD TAG)	Pins 1 & 2 closed
512KB (B) (Aster TAG)	Pins 2 & 3 closed

CPU SPEED SELECTION (CYRIX)
CPU speed	Clock speed	Multiplier	JP6	JP7	JP15	JP16	JP21
120MHz	50MHz	2x	Open	Open	Open	Closed	1 & 2
133MHz	55MHz	2x	Open	Closed	Open	Closed	1 & 2
150MHz	60MHz	2x	Closed	Closed	Open	Closed	2 & 3
166MHz	66MHz	2x	Closed	Open	Open	Closed	2 & 3
Note: Pins designated should be in the closed position.

CPU SPEED SELECTION (AMD)
CPU speed	Clock speed	Multiplier	JP6	JP7	JP15	JP16	JP21
75MHz	66MHz	1x	Closed	Open	Open	Closed	2 & 3
75MHz	50MHz	1.5x	Open	Open	Open	Open	1 & 2
90MHz	55MHz	1.5x	Open	Closed	Open	Open	2 & 3
90MHz	60MHz	1.5x	Closed	Closed	Open	Open	2 & 3
100MHz	66MHz	1.5x	Closed	Open	Open	Open	2 & 3
Note: Pins designated should be in the closed position.

CPU SPEED SELECTION (INTEL)
CPU speed	Clock speed	Multiplier	JP6	JP7	JP15	JP16	JP21
75MHz	50MHz	1.5x	Open	Open	Open	Open	1 & 2
90MHz	60MHz	1.5x	Closed	Closed	Open	Open	2 & 3
100MHz	66MHz	1.5x	Closed	Open	Open	Open	2 & 3
120MHz	60MHz	2x	Closed	Closed	Open	Closed	2 & 3
133MHz	66MHz	2x	Closed	Open	Open	Closed	2 & 3
150MHz	60MHz	2.5x	Closed	Closed	Closed	Closed	2 & 3
166MHz	66MHz	2.5x	Closed	Open	Closed	Closed	2 & 3
180MHz	60MHz	3x	Closed	Closed	Closed	Open	2 & 3
200MHz	66MHz	3x	Closed	Open	Closed	Open	2 & 3
Note: Pins designated should be in the closed position.

CPU TYPE SELECTION
Type	JP20	JP23	JP24
CX M1	Open	Pins 1 & 2, 4 & 5 closed	Pins 2 & 3, 4 & 5, 7 & 8, 9 & 10 closed
AM K5	Open	Pins 1 & 2, 4 & 5 closed	Pins 2 & 3, 4 & 5, 7 & 8, 9 & 10 closed
P54C/CQS/CT	Open	Pins 1 & 2, 4 & 5 closed	Pins 2 & 3, 4 & 5, 7 & 8, 9 & 10 closed
P55C/CT	Closed	Pins 2 & 3, 5 & 6 closed	Pins 1 & 2, 3 & 4, 6 & 7, 8 & 9 closed

CPU VOLTAGE SELECTION
Voltage	JP27
3.4v	Closed
3.5v	Open

SERIAL PORT 2 SELECTION
Setting	JP35	JP36
Used as COM2	Pins 1 & 2 closed	Pins 1 & 2 closed
Used as IR connector	Pins 2 & 3 closed	Pins 2 & 3 closed