486 VESA Motherboard Settings and Configuration

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486 VESA

Processor
80486SX/80487SX/80486DX/80486DX2
Processor Speed
20/25/33/50(internal)/50/66(internal)MHz
Chip Set
UNI
Max. Onboard DRAM
128MB
Cache
32/64/128/256KB
BIOS
AMI
Dimensions
254mm x 218mm
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
32-bit VESA Local bus slots
S1
Speaker
J6
32-bit VESA Local bus slots
S2
Reset switch
JP18
32-bit VESA Local bus slots
S3
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 1 & 2 closed

CMOS memory clear
JP2
pins 2 & 3 closed
»
Factory configured - do not alter
JP20
Closed
»
V-L bus clock select - normal
JP43
pins 2 & 3 closed

V-L bus clock select - adjusted
JP43
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) 1M x 9
(4) 256K x 9
8MB
(4) 1M x 9
(4) 1M x 9
16MB
(4) 4M x 9
NONE
17MB
(4) 4M x 9
(4) 256K x 9
20MB
(4) 4M x 9
(4) 1M x 9
32MB
(4) 4M x 9
(4) 4M x 9
64MB
(4) 16M x 9
NONE
65MB
(4) 16M x 9
(4) 256K x 9
68MB
(4) 16M x 9
(4) 4M x 9
80MB
(4) 16M x 9
(4) 4M x 9
128MB
(4) 16M x 9
(4) 16M x 9

CPU TYPE CONFIGURATION
Type
JP4
JP19
JP44
80486SX
pins 5 & 6 closed
Open
pins 2 & 3 closed
80487SX
pins 2 & 3, 4 & 5, 6 & 7 closed
Open
pins 2 & 3 closed
80486DX/33
pins 1 & 2, 4 & 5, 6 & 7 closed
Open
pins 2 & 3 closed
80486DX/50
pins 1 & 2, 4 & 5, 6 & 7 closed
Closed
pins 1 & 2 closed
80486DX2
pins 1 & 2, 4 & 5, 6 & 7 closed
Open
pins 2 & 3 closed

CPU SPEED CONFIGURATION
Speed
JP29
JP30
JP31
20MHz
Open
Closed
Closed
25Mhz
Closed
Open
Closed
33MHz
Closed
Closed
Open
50i MHz
Open
Closed
Open
50MHz
Closed
Open
Closed
66i MHz
Closed
Closed
Open

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 and 3 & 4 closed
256KB
Closed
Closed
Closed
pins 1 & 2 and 4 & 5 closed

VESA CONFIGURATION
Setting
JP40
JP41
JP42
V-L bus master
Open
Open
Open
V-L bus slave
Closed
Closed
Closed

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486 VESA Motherboard Settings and Configuration

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Processor	80486SX/80487SX/80486DX/80486DX2
Processor Speed	20/25/33/50(internal)/50/66(internal)MHz
Chip Set	UNI
Max. Onboard DRAM	128MB
Cache	32/64/128/256KB
BIOS	AMI
Dimensions	254mm x 218mm
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	32-bit VESA Local bus slots	S1
Speaker	J6	32-bit VESA Local bus slots	S2
Reset switch	JP18	32-bit VESA Local bus slots	S3
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 1 & 2 closed
	CMOS memory clear	JP2	pins 2 & 3 closed
»	Factory configured - do not alter	JP20	Closed
»	V-L bus clock select - normal	JP43	pins 2 & 3 closed
	V-L bus clock select - adjusted	JP43	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) 1M x 9	(4) 256K x 9
8MB	(4) 1M x 9	(4) 1M x 9
16MB	(4) 4M x 9	NONE
17MB	(4) 4M x 9	(4) 256K x 9
20MB	(4) 4M x 9	(4) 1M x 9
32MB	(4) 4M x 9	(4) 4M x 9
64MB	(4) 16M x 9	NONE
65MB	(4) 16M x 9	(4) 256K x 9
68MB	(4) 16M x 9	(4) 4M x 9
80MB	(4) 16M x 9	(4) 4M x 9
128MB	(4) 16M x 9	(4) 16M x 9

CPU TYPE CONFIGURATION
Type	JP4	JP19	JP44
80486SX	pins 5 & 6 closed	Open	pins 2 & 3 closed
80487SX	pins 2 & 3, 4 & 5, 6 & 7 closed	Open	pins 2 & 3 closed
80486DX/33	pins 1 & 2, 4 & 5, 6 & 7 closed	Open	pins 2 & 3 closed
80486DX/50	pins 1 & 2, 4 & 5, 6 & 7 closed	Closed	pins 1 & 2 closed
80486DX2	pins 1 & 2, 4 & 5, 6 & 7 closed	Open	pins 2 & 3 closed

CPU SPEED CONFIGURATION
Speed	JP29	JP30	JP31
20MHz	Open	Closed	Closed
25Mhz	Closed	Open	Closed
33MHz	Closed	Closed	Open
50i MHz	Open	Closed	Open
50MHz	Closed	Open	Closed
66i MHz	Closed	Closed	Open

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 and 3 & 4 closed
256KB	Closed	Closed	Closed	pins 1 & 2 and 4 & 5 closed

VESA CONFIGURATION
Setting	JP40	JP41	JP42
V-L bus master	Open	Open	Open
V-L bus slave	Closed	Closed	Closed