GA-486IS Motherboard Settings and Configuration

GIGA-BYTE TECHNOLOGY CO., LTD.

GA-486IS

Processor
80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive
Processor Speed
25/33/50(internal)/66(internal)MHz
Chip Set
Intel
Max. Onboard DRAM
128MB
Cache
64/128/256/512KB
BIOS
AMI
Dimensions
230mm x 218mm
I/O Options
32-bit PCI local bus slots (4)
NPU Options
None

CONNECTIONS
Purpose
Location
Purpose
Location
Power LED & keylock
J1
Power down mode LED
JP27
Speaker
J2
32-bit PCI Local bus slot
S1
Turbo LED
J3
32-bit PCI Local bus slot
S2
External power control port
J5
32-bit PCI Local bus slot
S3
Reset switch
JP9
32-bit PCI Local bus slot
S4
Turbo switch
JP21

USER CONFIGURABLE SETTINGS
Function
Jumper
Position
»
CMOS memory normal operation
J4
Open

CMOS memory clear
J4
Closed

DRAM CONFIGURATION
Size
Bank 0
Bank 3
2MB
(2) 1M x 36
NONE
4MB
(2) 1M x 36
(2) 1M x 36
4MB
(2) 2M x 36
NONE
6MB
(2) 2M x 36
(2) 1M x 36
8MB
(2) 2M x 36
(2) 2M x 36
8MB
(2) 4M x 36
NONE
10MB
(2) 4M x 36
(2) 1M x 36
12MB
(2) 4M x 36
(2) 2M x 36
16MB
(2) 4M x 36
(2) 4M x 36
16MB
(2) 8M x 36
NONE
18MB
(2) 8M x 36
(2) 1M x 36
20MB
(2) 8M x 36
(2) 2M x 36
24MB
(2) 8M x 36
(2) 4M x 36
32MB
(2) 8M x 36
(2) 8M x 36
32MB
(2) 16M x 36
NONE
34MB
(2) 16M x 36
(2) 1M x 36
36MB
(2) 16M x 36
(2) 2M x 36
40MB
(2) 16M x 36
(2) 4M x 36
48MB
(2) 16M x 36
(2) 8M x 36
64MB
(2) 16M x 36
(2) 16M x 36
64MB
(2) 32M x 36
NONE
128MB
(2) 32M x 36
(2) 32M x 36

CACHE CONFIGURATION
Size
Bank 0
Bank 1
TAG
64KB
(4) 8K x 8
(4) 8K x 8
(1) 8K x 8
128KB
(4) 32K x 8
NONE
(1) 8K x 8
256KB
(4) 32K x 8
(4) 32K x 8
(1) 16K x 8
512KB
(4) 128K x 8
NONE
(1) 32K x 8

CACHE JUMPER CONFIGURATION
Size
J6
J7
J9
JP11
JP12
64KB
Open
Open
Open
Closed
Closed
128KB
Open
Closed
Open
Closed
Open
256KB
Closed
Closed
Open
Open
Closed
512KB
Closed
Closed
Closed
Open
Open

CPU TYPE CONFIGURATION
Type
JP10
80486SX
pins 2 & 3 closed
80487SX
pins 2 & 3 closed
80486DX
pins 1 & 2 closed
ODP486SX
pins 1 & 2 closed
80486DX2
pins 1 & 2 closed
Pentium Overdrive
pins 1 & 2 closed

CPU SPEED CONFIGURATION
Speed
JP7
JP18
25MHz
pins 2 & 3 closed
Closed
33MHz
pins 1 & 2 closed
Open
50iMHz
pins 2 & 3 closed
Closed
66iMHz
pins 1 & 2 closed
Open

PCI IRQ INTERRUPT CONFIGURATION
IRQ
JP20
JP21
JP22
JP23
9
Closed
Open
Open
Open
10
Open
Closed
Open
Open
11
Open
Open
Closed
Open
14
Open
Open
Open
Closed

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GA-486IS Motherboard Settings and Configuration

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Processor	80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive
Processor Speed	25/33/50(internal)/66(internal)MHz
Chip Set	Intel
Max. Onboard DRAM	128MB
Cache	64/128/256/512KB
BIOS	AMI
Dimensions	230mm x 218mm
I/O Options	32-bit PCI local bus slots (4)
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Power LED & keylock	J1	Power down mode LED	JP27
Speaker	J2	32-bit PCI Local bus slot	S1
Turbo LED	J3	32-bit PCI Local bus slot	S2
External power control port	J5	32-bit PCI Local bus slot	S3
Reset switch	JP9	32-bit PCI Local bus slot	S4
Turbo switch	JP21

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	CMOS memory normal operation	J4	Open
	CMOS memory clear	J4	Closed

DRAM CONFIGURATION
Size	Bank 0	Bank 3
2MB	(2) 1M x 36	NONE
4MB	(2) 1M x 36	(2) 1M x 36
4MB	(2) 2M x 36	NONE
6MB	(2) 2M x 36	(2) 1M x 36
8MB	(2) 2M x 36	(2) 2M x 36
8MB	(2) 4M x 36	NONE
10MB	(2) 4M x 36	(2) 1M x 36
12MB	(2) 4M x 36	(2) 2M x 36
16MB	(2) 4M x 36	(2) 4M x 36
16MB	(2) 8M x 36	NONE
18MB	(2) 8M x 36	(2) 1M x 36
20MB	(2) 8M x 36	(2) 2M x 36
24MB	(2) 8M x 36	(2) 4M x 36
32MB	(2) 8M x 36	(2) 8M x 36
32MB	(2) 16M x 36	NONE
34MB	(2) 16M x 36	(2) 1M x 36
36MB	(2) 16M x 36	(2) 2M x 36
40MB	(2) 16M x 36	(2) 4M x 36
48MB	(2) 16M x 36	(2) 8M x 36
64MB	(2) 16M x 36	(2) 16M x 36
64MB	(2) 32M x 36	NONE
128MB	(2) 32M x 36	(2) 32M x 36

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TAG
64KB	(4) 8K x 8	(4) 8K x 8	(1) 8K x 8
128KB	(4) 32K x 8	NONE	(1) 8K x 8
256KB	(4) 32K x 8	(4) 32K x 8	(1) 16K x 8
512KB	(4) 128K x 8	NONE	(1) 32K x 8

CACHE JUMPER CONFIGURATION
Size	J6	J7	J9	JP11	JP12
64KB	Open	Open	Open	Closed	Closed
128KB	Open	Closed	Open	Closed	Open
256KB	Closed	Closed	Open	Open	Closed
512KB	Closed	Closed	Closed	Open	Open

CPU TYPE CONFIGURATION
Type	JP10
80486SX	pins 2 & 3 closed
80487SX	pins 2 & 3 closed
80486DX	pins 1 & 2 closed
ODP486SX	pins 1 & 2 closed
80486DX2	pins 1 & 2 closed
Pentium Overdrive	pins 1 & 2 closed

CPU SPEED CONFIGURATION
Speed	JP7	JP18
25MHz	pins 2 & 3 closed	Closed
33MHz	pins 1 & 2 closed	Open
50iMHz	pins 2 & 3 closed	Closed
66iMHz	pins 1 & 2 closed	Open

PCI IRQ INTERRUPT CONFIGURATION
IRQ	JP20	JP21	JP22	JP23
9	Closed	Open	Open	Open
10	Open	Closed	Open	Open
11	Open	Open	Closed	Open
14	Open	Open	Open	Closed