ISA-486 Motherboard Settings and Configuration

UNIDENTIFIED

ISA-486

Processor
80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed
16/20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set
Unidentified
Max. Onboard DRAM
32MB
Cache
64/128/256KB
BIOS
AMI
Dimensions
254mm x 220mm
I/O Options
32-bit VESA local bus slots (2)
NPU Options
None

CONNECTIONS
Purpose
Location
Purpose
Location
Turbo LED
JP10
External battery
JP17
Speaker
JP11
Turbo switch
JP32
Power LED & keylock
JP13
32-bit VESA local bus slots
SL1 & SL2
Reset switch
JP15

USER CONFIGURABLE SETTINGS
Function
Jumper
Position
»
Factory configured - do not alter
ID2
Closed
»
Factory configured - do not alter
JP1
Open
»
Factory configured - do not alter
JP9
pins 1 & 2 closed
»
Monitor type select color
JP12
Closed

Monitor type select monochrome
JP12
Open
»
CMOS memory normal operation
JP16
pins 1 & 2 closed

CMOS memory clear
JP16
pins 2 & 3 closed
»
Factory configured - do not alter
JP29
pins 1 & 2 closed
»
Factory configured - do not alter
JP100
Open
»
Factory configured - do not alter
JP101
Open
»
Factory configured - do not alter
JP102
pins 2 & 3 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
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
64KB
pins 2 & 3 closed
pins 2 & 3 closed
pins 2 & 3 closed
128KB
pins 2 & 3 closed
pins 1 & 2 closed
pins 2 & 3 closed
256KB
pins 1 & 2 closed
pins 1 & 2 closed
pins 1 & 2 closed

CPU TYPE CONFIGURATION
Type
JP2
JP3
JP4
JP5
80486SX
pins 1 & 2 closed
Open
Open
Open
80487SX
pins 2 & 3 closed
Closed
pins 1 & 2 closed
Closed
80486DX/DX2
pins 2 & 3 closed
Closed
pins 2 & 3 closed
Open

CPU SPEED CONFIGURATION
Speed
JP30
16MHz
pins 2 & 3 closed
20MHz
pins 2 & 3 closed
25MHz
pins 2 & 3 closed
33MHz
pins 1 & 2 closed
50iMHz
pins 2 & 3 closed
50MHz
pins 1 & 2 closed
66iMHz
pins 1 & 2 closed

BUS SPEED CONFIGURATION
CPU speed
ID3
<= 33MHz
Open
> 33MHz
Closed

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ISA-486 Motherboard Settings and Configuration

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Processor	80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed	16/20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set	Unidentified
Max. Onboard DRAM	32MB
Cache	64/128/256KB
BIOS	AMI
Dimensions	254mm x 220mm
I/O Options	32-bit VESA local bus slots (2)
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
Turbo LED	JP10	External battery	JP17
Speaker	JP11	Turbo switch	JP32
Power LED & keylock	JP13	32-bit VESA local bus slots	SL1 & SL2
Reset switch	JP15

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Factory configured - do not alter	ID2	Closed
»	Factory configured - do not alter	JP1	Open
»	Factory configured - do not alter	JP9	pins 1 & 2 closed
»	Monitor type select color	JP12	Closed
	Monitor type select monochrome	JP12	Open
»	CMOS memory normal operation	JP16	pins 1 & 2 closed
	CMOS memory clear	JP16	pins 2 & 3 closed
»	Factory configured - do not alter	JP29	pins 1 & 2 closed
»	Factory configured - do not alter	JP100	Open
»	Factory configured - do not alter	JP101	Open
»	Factory configured - do not alter	JP102	pins 2 & 3 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
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
64KB	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed
128KB	pins 2 & 3 closed	pins 1 & 2 closed	pins 2 & 3 closed
256KB	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed

CPU TYPE CONFIGURATION
Type	JP2	JP3	JP4	JP5
80486SX	pins 1 & 2 closed	Open	Open	Open
80487SX	pins 2 & 3 closed	Closed	pins 1 & 2 closed	Closed
80486DX/DX2	pins 2 & 3 closed	Closed	pins 2 & 3 closed	Open

CPU SPEED CONFIGURATION
Speed	JP30
16MHz	pins 2 & 3 closed
20MHz	pins 2 & 3 closed
25MHz	pins 2 & 3 closed
33MHz	pins 1 & 2 closed
50iMHz	pins 2 & 3 closed
50MHz	pins 1 & 2 closed
66iMHz	pins 1 & 2 closed

BUS SPEED CONFIGURATION
CPU speed	ID3
<= 33MHz	Open
> 33MHz	Closed