GMB-486UNL Motherboard Settings and Configuration

ROBOTECH, INC.

GMB-486UNL

Processor
80486SX/80487SX/80486DX/80486DX2
Processor Speed
25/33/40/50(internal)/50/66(internal)MHz
Chip Set
Toshiba
Max. Onboard DRAM
32MB
Cache
64/128/256KB
BIOS
AMI
Dimensions
260mm x 220mm
I/O Options
32-bit VESA local bus slots (3)
NPU Options
None

CONNECTIONS
Purpose
Location
Purpose
Location
External battery
J4
Turbo switch
JP17
Power LED & keylock
J5
Reset switch
JP18
Speaker
J6
32-bit VESA local bus slots
SL1 - SL3
Turbo LED
JP16

USER CONFIGURABLE SETTINGS
Function
Jumper
Position
»
Monitor type select color
JP1
Closed

Monitor type select monochrome
JP1
Open
»
CMOS memory normal operation
JP2
pins 2 & 3 closed

CMOS memory clear
JP2
pins 1 & 2 closed

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) 4M x 9
NONE
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

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

CACHE JUMPER CONFIGURATION
Size
JP6
JP7
JP9
JP11
32KB
Open
Open
Open
pins 2 & 3 closed
64KB
Open
Closed
Open
pins 1 & 2 closed
128KB
Open
Closed
Closed
pins 1 & 2, 3 & 4 closed
256KB
Closed
Closed
Closed
pins 1 & 2, 4 & 5 closed

CPU TYPE CONFIGURATION
Type
JP4
80486SX
pins 5 & 6 closed
80487SX
pins 2 & 3, 4 & 5, 6 & 7 closed
80486DX/DX2
pins 1 & 2, 4 & 5, 6 & 7 closed

CPU SPEED CONFIGURATION
Speed
JP29
JP30
JP31
25MHz
Closed
Open
Closed
33MHz
Closed
Closed
Open
40MHz
Open
Open
Closed
50iMHz
Closed
Open
Closed
50MHz
Open
Closed
Open
66iMHz
Closed
Closed
Open

VESA CLOCK SPEED CONFIGURATION
CPU speed
JP43
Same phase as CPU
pins 2 & 3 closed
Same phase as Toshiba U4800 chipset
pins 1 & 2 closed

BUS SPEED CONFIGURATION
CPU speed
JP19
<=33MHz
Open
>33MHz
Closed

VESA WAIT STATE CONFIGURATION
Wait states
JP20
0 wait states
Open
1 wait state
Closed

VESA MASTER/SLAVE CONFIGURATION
Setting
JP40
JP41
JP42
JP44
JP45
PAL/GAL installed
Open
Open
Open
pins 1 & 2 closed
pins 2 & 3 closed
PAL/GAL not installed
Closed
Closed
Closed
pins 2 & 3 closed
pins 2 & 3 closed

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GMB-486UNL Motherboard Settings and Configuration

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Processor	80486SX/80487SX/80486DX/80486DX2
Processor Speed	25/33/40/50(internal)/50/66(internal)MHz
Chip Set	Toshiba
Max. Onboard DRAM	32MB
Cache	64/128/256KB
BIOS	AMI
Dimensions	260mm x 220mm
I/O Options	32-bit VESA local bus slots (3)
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	J4	Turbo switch	JP17
Power LED & keylock	J5	Reset switch	JP18
Speaker	J6	32-bit VESA local bus slots	SL1 - SL3
Turbo LED	JP16

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Monitor type select color	JP1	Closed
	Monitor type select monochrome	JP1	Open
»	CMOS memory normal operation	JP2	pins 2 & 3 closed
	CMOS memory clear	JP2	pins 1 & 2 closed

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) 4M x 9	NONE
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

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

CACHE JUMPER CONFIGURATION
Size	JP6	JP7	JP9	JP11
32KB	Open	Open	Open	pins 2 & 3 closed
64KB	Open	Closed	Open	pins 1 & 2 closed
128KB	Open	Closed	Closed	pins 1 & 2, 3 & 4 closed
256KB	Closed	Closed	Closed	pins 1 & 2, 4 & 5 closed

CPU TYPE CONFIGURATION
Type	JP4
80486SX	pins 5 & 6 closed
80487SX	pins 2 & 3, 4 & 5, 6 & 7 closed
80486DX/DX2	pins 1 & 2, 4 & 5, 6 & 7 closed

CPU SPEED CONFIGURATION
Speed	JP29	JP30	JP31
25MHz	Closed	Open	Closed
33MHz	Closed	Closed	Open
40MHz	Open	Open	Closed
50iMHz	Closed	Open	Closed
50MHz	Open	Closed	Open
66iMHz	Closed	Closed	Open

VESA CLOCK SPEED CONFIGURATION
CPU speed	JP43
Same phase as CPU	pins 2 & 3 closed
Same phase as Toshiba U4800 chipset	pins 1 & 2 closed

BUS SPEED CONFIGURATION
CPU speed	JP19
<=33MHz	Open
>33MHz	Closed

VESA WAIT STATE CONFIGURATION
Wait states	JP20
0 wait states	Open
1 wait state	Closed

VESA MASTER/SLAVE CONFIGURATION
Setting	JP40	JP41	JP42	JP44	JP45
PAL/GAL installed	Open	Open	Open	pins 1 & 2 closed	pins 2 & 3 closed
PAL/GAL not installed	Closed	Closed	Closed	pins 2 & 3 closed	pins 2 & 3 closed