AIR486PI REV. 1 Motherboard Settings and Configuration

Processor	80486SX/80487SX/80486DX/80486DX2/80486DX4/Pentium Overdrive
Processor Speed	25/33/50(internal)/66(internal)MHz
Chip Set	Intel
Max. Onboard DRAM	128MB
Cache	128/256/512KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	32-bit PCI slots (3), 32-bit VESA local bus slots (2), floppy drive interfaces (2), green PC connector, IDE interface, parallel port, serial ports (2)
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Floppy drive interface 2	CN1	External battery	J2
Floppy drive interface 1	CN2	Turbo switch	J3
Parallel port	CN3	Speaker	J4
IDE interface	CN4	IDE interface LED	J5
Green PC connector	CN5	Power LED & keylock	J6
Serial port 1	CN6	Reset switch	J7
Serial port 2	CN7	32-bit PCI slots	PC1 - PC3
Turbo LED	J1	32-bit VESA local bus slots	SL1 & SL2

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Green PC select auto	CN5	Open
	Green PC select forced	CN5	Closed
»	CMOS memory normal operation	JP1	pins 1 & 2 closed
	CMOS memory clear	JP1	pins 2 & 3 closed
»	Factory configured - do not alter	JP2	pins 1 & 2 closed
»	Parallel port IRQ select IRQ7	JP3	pins 1 & 2 closed
	Parallel port IRQ select IRQ5	JP3	pins 2 & 3 closed
»	Monitor type select VGA/EGA/monochrome	JP5	Open
	Monitor type select CGA	JP5	Closed
»	Factory configured - do not alter	JP13	pins 1 & 2 closed
»	Factory configured - do not alter	JP14	pins 1 & 2 closed
»	Factory configured - do not alter	JP17	Closed
»	Factory configured - do not alter	JP18	Open
»	Factory configured - do not alter	JP23	pins 2 & 3 closed
»	Factory configured - do not alter	JP24	Open
»	Factory configured - do not alter	JP26	Closed
»	Factory configured - do not alter	JP27	Open
»	Factory configured - do not alter	JP28	pins 1 & 2 closed
»	Factory configured - do not alter	JP29	Open
»	Factory configured - do not alter	JP30	Open
Note: The location of the factory configured jumpers are unknown.

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
4MB	(1) 1M x 36	NONE	NONE	NONE
8MB	(1) 1M x 36	(1) 1M x 36	NONE	NONE
8MB	(1) 2M x 36	NONE	NONE	NONE
12MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36	NONE
12MB	(1) 2M x 36	(1) 1M x 36	NONE	NONE
16MB	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36	(1) 1M x 36
16MB	(1) 2M x 36	(1) 1M x 36	NONE	(1) 1M x 36
16MB	(1) 2M x 36	(1) 2M x 36	NONE	NONE
16MB	(1) 4M x 36	NONE	NONE	NONE
20MB	(1) 1M x 36	(1) 4M x 36	NONE	NONE
24MB	(1) 1M x 36	(1) 1M x 36	(1) 4M x 36	NONE
24MB	(1) 2M x 36	(1) 4M x 36	NONE	NONE
32MB	(1) 4M x 36	(1) 4M x 36	NONE	NONE
32MB	(1) 8M x 36	NONE	NONE	NONE
36MB	(1) 1M x 36	(1) 4M x 36	(1) 4M x 36	NONE
40MB	(1) 1M x 36	(1) 1M x 36	(1) 4M x 36	(1) 4M x 36
40MB	(1) 2M x 36	(1) 4M x 36	NONE	(1) 4M x 36
40MB	(1) 2M x 36	(1) 8M x 36	NONE	NONE
48MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	NONE
64MB	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36	(1) 4M x 36

DRAM CONFIGURATION (CON’T)
Size	Bank 0	Bank 1	Bank 2	Bank 3
64MB	(1) 8M x 36	(1) 8M x 36	NONE	NONE
68MB	(1) 1M x 36	(1) 16M x 36	NONE	NONE
72MB	(1) 2M x 36	(1) 16M x 36	NONE	NONE
80MB	(1) 4M x 36	(1) 16M x 36	NONE	NONE
96MB	(1) 8M x 36	(1) 16M x 36	NONE	NONE
128MB	(1) 16M x 36	(1) 16M x 36	NONE	NONE

CACHE CONFIGURATION
Size	Bank 0	Bank 1
128KB	(4) 32K x 8	NONE
256KB	(4) 32K x 8	(4) 32K x 8
512KB	(4) 128K x 8	NONE

CACHE JUMPER CONFIGURATION
Size	JP8	JP9	JP10	JP11	JP12
128KB	Closed	Open	Open	Open	Open
256KB	Open	Closed	Closed	Closed	Open
512KB	Closed	Open	Open	Closed	Closed

CPU TYPE CONFIGURATION
Type	JP25
80486SX	pins 2 & 3 closed
80487SX	pins 1 & 2 closed
80486DX/DX2/DX4	pins 1 & 2 closed
Pentium Overdrive	pins 1 & 2 closed

CPU SPEED CONFIGURATION
Speed	JP19	JP20	JP21	JP22
25MHz	Closed	Open	Open	pins 2 & 3 closed
33MHz	Open	Closed	Closed	pins 1 & 2 closed
50iMHz	Closed	Open	Open	pins 2 & 3 closed
66iMHz	Open	Closed	Closed	pins 1 & 2 closed

FLOPPY DRIVE CONFIGURATION
4 floppies used	ECP mode	JP4	JP6	JP7
Yes	Disabled	Open	Open	pins 1 & 2 closed
No	Enabled (DMA 3)	pins 1 & 2 closed	pins 1 & 2 closed	pins 2 & 3 closed
No	Enabled (DMA 1)	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed