486SX/DX/DX2-MAINBOARD Motherboard Settings and Configuration

UNIDENTIFIED

486SX/DX/DX2-MAINBOARD

Processor
80486SX/80486DX/80486DX2
Processor Speed
20/25/33/50(internal)/50/66(internal)MHz
Chip Set
UNI
Video Chip Set
None
Maximum Onboard Memory
32MB
Maximum Video Memory
None
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
Turbo switch
H1
Reset switch
H5
Turbo LED
H2
External battery
J1
Power LED & keylock
H3
32-bit VESA local bus slots
SL1 - SL3
Speaker
H4

USER CONFIGURABLE SETTINGS
Function
Label
Position
»
Turbo enabled
H1
Closed

Turbo enabled through keyboard (CTRL, ALT, +)
H1
Open

Turbo disabled through keyboard (CTRL, ALT, -)
H1
Open
»
CMOS memory normal operation
J1
Pins 2 & 3 closed

CMOS memory clear
J1
Pins 3 & 4 closed

Battery type select external
J1
Closed
»
Monitor type select color
J3
Closed

Monitor type select monochrome
J3
Open
»
VL-BUS clock normal operation
JP43
Pins 2 & 3 closed

VL-BUS clock 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) 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
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
JP8
JP9
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 SPEED SELECTION
Speed
JP29
JP30
JP31
20MHz
Open
Closed
Open
25MHz
Closed
Open
Closed
33MHz
Closed
Closed
Open
50iMHz
Closed
Open
Closed
50MHz
Open
Closed
Open
66iMHz
Closed
Closed
Open

CPU TYPE SELECTION
Type
JP4
80486SX
Pins 5 & 6 closed
80486DX
Pins 1 & 2, 4 & 5, 6 & 7 closed
80486DX2
Pins 1 & 2, 4 & 5, 6 & 7 closed

VL BUS WAIT STATE SELECTION
Setting
JP20

0
Open
»
1
Closed

VL BUS SPEED SELECTION
Speed
JP19

<= 33MHz
Open
»
>33 MHz
Closed

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486SX/DX/DX2-MAINBOARD Motherboard Settings and Configuration

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Processor	80486SX/80486DX/80486DX2
Processor Speed	20/25/33/50(internal)/50/66(internal)MHz
Chip Set	UNI
Video Chip Set	None
Maximum Onboard Memory	32MB
Maximum Video Memory	None
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
Turbo switch	H1	Reset switch	H5
Turbo LED	H2	External battery	J1
Power LED & keylock	H3	32-bit VESA local bus slots	SL1 - SL3
Speaker	H4

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Turbo enabled	H1	Closed
	Turbo enabled through keyboard (CTRL, ALT, +)	H1	Open
	Turbo disabled through keyboard (CTRL, ALT, -)	H1	Open
»	CMOS memory normal operation	J1	Pins 2 & 3 closed
	CMOS memory clear	J1	Pins 3 & 4 closed
	Battery type select external	J1	Closed
»	Monitor type select color	J3	Closed
	Monitor type select monochrome	J3	Open
»	VL-BUS clock normal operation	JP43	Pins 2 & 3 closed
	VL-BUS clock 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) 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
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	JP8	JP9
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 SPEED SELECTION
Speed	JP29	JP30	JP31
20MHz	Open	Closed	Open
25MHz	Closed	Open	Closed
33MHz	Closed	Closed	Open
50iMHz	Closed	Open	Closed
50MHz	Open	Closed	Open
66iMHz	Closed	Closed	Open

CPU TYPE SELECTION
Type	JP4
80486SX	Pins 5 & 6 closed
80486DX	Pins 1 & 2, 4 & 5, 6 & 7 closed
80486DX2	Pins 1 & 2, 4 & 5, 6 & 7 closed

VL BUS WAIT STATE SELECTION
Setting		JP20
	0	Open
»	1	Closed

VL BUS SPEED SELECTION
Speed		JP19
	<= 33MHz	Open
»	>33 MHz	Closed