GMB-486UN Motherboard Settings and Configuration

ROBOTECH, INC.

GMB-486UN

Processor
80486SX/80486DX/80486DX2
Processor Speed
25/33/50/66MHz
Chip Set
UMC
Max. onboard DRAM
32MB
Cache
32/64/128/256KB
BIOS
AMI
Dimensions
254mm x 218mm
I/O Options
None
NPU Options
None

CONNECTIONS
Purpose
Location
Purpose
Location
External battery
CN1
Reset switch
CN6
Turbo LED
CN4
Speaker
CN7
Turbo switch
CN5
Power LED & keylock
CN8

USER CONFIGURABLE SETTINGS
Function
Switch
Setting
»
CMOS memory normal operation
JP2
1 & 2 closed

CMOS memory clear
JP2
2 & 3 closed
»
Hardware Emulate KBGA20
JP10
1 & 2 closed

Keyboard controller 8042
JP10
2 & 3 closed
»
Monitor type select color
JP12
Closed

Monitor type select monochrome
JP12
Open

DRAM CONFIGURATION
Size
Bank 0
Bank 1
1MB
(4) 256K x 9
NONE
2MB
(4) 256K x 9
(4) 256K x 9
4MB
(4) 1M x 9
NONE
5MB
(4) 256K x 9
(4) 1M x 9
8MB
(4) 1M x 9
(4) 1M x 9
16MB
(4) 1M x 9
(4) 1M x 9
20MB
(4) 1M x 9
(4) 4M x 9
20MB
(4) 4M x 9
(4) 1M x 9
32MB
(4) 4M x 9
(4) 4M x 9

EPROM TYPE CONFIGURATION
CPU
JP3
JP7
JP9
JP13
80486SX-25
2 & 3
Open
2 & 3
2 & 3
80486DX-33
1 & 2
1 & 2
1 & 2, 3 & 4
1 & 2
80486DX-50
2 & 3
1 & 2
1 & 2, 3 & 4
1 & 2
80486DX2-50
1 & 2
1 & 2
1 & 2, 3 & 4
1 & 2
80486DX2-66
1 & 2
1 & 2
1 & 2, 3 & 4
1 & 2
Note: Pins designated should be in the closed position.

CACHE TYPE CONFIGURATION
Size
Bank 0
Bank 1
TAG
32KB
(4) 8K x 8
NONE
(1) 8K x 8
64KB
(4) 8K x 8
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) 32K x 8

CACHE SIZE CONFIGURATION
Size
JP22
JP23
JP25
JP26
32KB
2 & 3
Open
2 & 3
2 & 3
64KB
1 & 2
1 & 2
1 & 2, 3 & 4
1 & 2
128KB
2 & 3
1 & 2
1 & 2, 3 & 4
1 & 2
256KB
1 & 2
1 & 2
1 & 2, 3 & 4
1 & 2
Note: Pins designated should be in the closed position.

CACHE SIZE CONFIGURATION (CON’T)
Size
JP27
JP28
32KB
1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 & 10
Open
64KB
Open
1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 & 10
128KB
Open
Open
256KB
Open
Open
Note: Pins designated should be in the closed position.

CACHE SIZE CONFIGURATION (CON’T)
Size
JP29
JP30
32KB
Open
Open
64KB
Open
Open
128KB
1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 & 10
Open
256KB
Open
1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 & 10
Note: Pins designated should be in the closed position.

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GMB-486UN Motherboard Settings and Configuration

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Processor	80486SX/80486DX/80486DX2
Processor Speed	25/33/50/66MHz
Chip Set	UMC
Max. onboard DRAM	32MB
Cache	32/64/128/256KB
BIOS	AMI
Dimensions	254mm x 218mm
I/O Options	None
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	CN1	Reset switch	CN6
Turbo LED	CN4	Speaker	CN7
Turbo switch	CN5	Power LED & keylock	CN8

USER CONFIGURABLE SETTINGS
Function		Switch	Setting
»	CMOS memory normal operation	JP2	1 & 2 closed
	CMOS memory clear	JP2	2 & 3 closed
»	Hardware Emulate KBGA20	JP10	1 & 2 closed
	Keyboard controller 8042	JP10	2 & 3 closed
»	Monitor type select color	JP12	Closed
	Monitor type select monochrome	JP12	Open

DRAM CONFIGURATION
Size	Bank 0	Bank 1
1MB	(4) 256K x 9	NONE
2MB	(4) 256K x 9	(4) 256K x 9
4MB	(4) 1M x 9	NONE
5MB	(4) 256K x 9	(4) 1M x 9
8MB	(4) 1M x 9	(4) 1M x 9
16MB	(4) 1M x 9	(4) 1M x 9
20MB	(4) 1M x 9	(4) 4M x 9
20MB	(4) 4M x 9	(4) 1M x 9
32MB	(4) 4M x 9	(4) 4M x 9

EPROM TYPE CONFIGURATION
CPU	JP3	JP7	JP9	JP13
80486SX-25	2 & 3	Open	2 & 3	2 & 3
80486DX-33	1 & 2	1 & 2	1 & 2, 3 & 4	1 & 2
80486DX-50	2 & 3	1 & 2	1 & 2, 3 & 4	1 & 2
80486DX2-50	1 & 2	1 & 2	1 & 2, 3 & 4	1 & 2
80486DX2-66	1 & 2	1 & 2	1 & 2, 3 & 4	1 & 2
Note: Pins designated should be in the closed position.

CACHE TYPE CONFIGURATION
Size	Bank 0	Bank 1	TAG
32KB	(4) 8K x 8	NONE	(1) 8K x 8
64KB	(4) 8K x 8	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) 32K x 8

CACHE SIZE CONFIGURATION
Size	JP22	JP23	JP25	JP26
32KB	2 & 3	Open	2 & 3	2 & 3
64KB	1 & 2	1 & 2	1 & 2, 3 & 4	1 & 2
128KB	2 & 3	1 & 2	1 & 2, 3 & 4	1 & 2
256KB	1 & 2	1 & 2	1 & 2, 3 & 4	1 & 2
Note: Pins designated should be in the closed position.

CACHE SIZE CONFIGURATION (CON’T)
Size	JP27	JP28
32KB	1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 & 10	Open
64KB	Open	1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 & 10
128KB	Open	Open
256KB	Open	Open
Note: Pins designated should be in the closed position.

CACHE SIZE CONFIGURATION (CON’T)
Size	JP29	JP30
32KB	Open	Open
64KB	Open	Open
128KB	1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 & 10	Open
256KB	Open	1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 & 10
Note: Pins designated should be in the closed position.