AP55CS Motherboard Settings and Configuration

Device Type	Mainboard
Processor	CX 6X86/Pentium
Processor Speed	75/90/100/120/133/150/166MHz
Chip Set	SIS
Video Chip Set	Unidentified
Maximum Onboard Memory	128MB (EDO supported) Unified Memory Architecture (UMA)
Cache	256KB
BIOS	AMI
Dimensions	280mm x 220mm
I/O Options	32-bit PCI slots (3), floppy drive interface, IDE interfaces (2), parallel port, serial ports (2), VGA feature connector, VGA port, VRM connector
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Serial port 1	CN1	IDE interface LED	JP16
Serial port 2	CN2	Power LED & keylock	JP24/pins 1 – 5
Floppy drive interface	CN3	Speaker	JP24/pins 7 – 10
Parallel port	CN4	Turbo LED	JP24/pins 12 & 13
IDE interface 2	CN5	Turbo switch	JP24/pins 15 – 17
IDE interface 1	CN6	Reset switch	JP24/pins 19 & 20
VGA feature connector	CN7	32-bit PCI slots	PC1 – PC3
VGA port	J3	VRM connector	VRM
CPU fan power	J7

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Factory configured - do not alter	JP2	Unidentified
»	Factory configured - do not alter	JP3	Unidentified
»	Factory configured - do not alter	JP5	Unidentified
»	Factory configured - do not alter	JP8	Unidentified
»	Factory configured - do not alter	JP13	Unidentified
	On board I/O enabled	JP14	Pins 1 & 2 closed
	On board I/O disabled	JP14	Pins 2 & 3 closed
»	Factory configured - do not alter	JP17	Unidentified
»	CMOS memory normal operation	JP19	Pins 1 & 2 closed
	CMOS memory clear	JP19	Pins 2 & 3 closed

SIMM CONFIGURATION
Size	Bank 0	Bank 1
2MB	(2) 256K x 36	None
4MB	(2) 512K x 36	None
4MB	(2) 256K x 36	(2) 256K x 36
6MB	(2) 512K x 36	(2) 256K x 36
8MB	(2) 512K x 36	(2) 512K x 36
8MB	(2) 1M x 36	None
10MB	(2) 1M x 36	(2) 256K x 36
12MB	(2) 1M x 36	(2) 512K x 36
16MB	(2) 2M x 36	None
16MB	(2) 1M x 36	(2) 1M x 36
18MB	(2) 2M x 36	(2) 256K x 36

SIMM CONFIGURATION (CON’T)
Size	Bank 0	Bank 1
20MB	(2) 2M x 36	(2) 512K 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
34MB	(2) 4M x 36	(2) 256K x 36
36MB	(2) 4M x 36	(2) 512K 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
66MB	(2) 8M x 36	(2) 256K x 36
68MB	(2) 8M x 36	(2) 512K 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.

CACHE CONFIGURATION
Size	Bank 0
256KB	(2) 32K x 32

CACHE TYPE CONFIGURATION
Type	JP1
Linear mode	Pins 1 & 2 closed
Interleave mode	Pins 2 & 3 closed

CPU SPEED SELECTION (CX 6X86)
CPU speed	Clock speed	Multiplier	JP9	JP10	JP22	JP23
120MHz	50MHz	2x	2 & 3	2 & 3	Open	Open
150MHz	60MHz	2x	2 & 3	1 & 2	Open	Open
166MHz	66MHz	2x	1 & 2	2 & 3	Open	Open
Note: Pins designated should be in the closed position.

CPU SPEED SELECTION (INTEL)
CPU speed	Clock speed	Multiplier	JP9	JP10	JP22	JP23
75MHz	50MHz	1.5x	2 & 3	2 & 3	2 & 3	2 & 3
90MHz	60MHz	1.5x	2 & 3	1 & 2	2 & 3	2 & 3
100MHz	66MHz	1.5x	1 & 2	2 & 3	2 & 3	2 & 3
120MHz	60MHz	2x	2 & 3	1 & 2	1 & 2	2 & 3
133MHz	66MHz	2x	1 & 2	2 & 3	1 & 2	2 & 3
150MHz	60MHz	2.5x	2 & 3	1 & 2	1 & 2	1 & 2
166MHz	66MHz	2.5x	1 & 2	2 & 3	1 & 2	1 & 2
Note: Pins designated should be in the closed position.

DMA CHANNEL SELECTION
Channel	JP11	JP12
1	Pins 2 & 3 closed	Pins 2 & 3 closed
3	Pins 1 & 2 closed	Pins 1 & 2 closed

ON BOARD VIDEO SELECTION
Setting	JP4	JP6	JP7
Enabled	Closed	Pins 1 & 2 closed	Pins 2 & 3 closed
Disabled	Open	Pins 2 & 3 closed	Pins 3 & 4 closed

FLASH BIOS SELECTION
Setting	JP18
5v	Pins 2 & 3, 5 & 6 closed
12v	Pins 1 & 2, 5 & 6 closed
EEPROM	Pins 2 & 3, 4 & 5 closed