HIGH PERFORMANCE 486 SX/DX (MODEL 2270) Motherboard Settings and Configuration

JC INFORMATION SYSTEMS CORPORATION

HIGH PERFORMANCE 486 SX/DX (MODEL 2270)

Processor
80486SX/80486DX/80486DX2
Processor Speed
25/33/40/50/50(internal)/66(internal)MHz
Chip Set
Unidentified
Video Chip Set
None
Maximum Onboard Memory
64MB
Maximum Video Memory
None
Cache
64/256KB
BIOS
AMI
Dimensions
254mm x 218mm
I/O Options
32-bit VESA local bus slots (2)
NPU Options
None

CONNECTIONS
Purpose
Location
Purpose
Location
External battery
J1
Turbo LED
JP20
Power LED & keylock
J20
Reset switch
S1
Speaker
JP9
32-bit VESA local bus slots
SL1 & SL2
Turbo switch
JP19

USER CONFIGURABLE SETTINGS
Function
Label
Position
»
CMOS memory normal operation
JP1
Pins 2 & 3 closed

CMOS memory clear
JP1
Pins 1 & 2 closed

External battery installed at J1
JP1
Open

Monitor type select monochrome/EGA
JP2
Open

Monitor type select CGA
JP2
Closed
»
Factory configured - do not alter
JP10
Closed

Jumper information unavailable
JP11
Unidentified

Jumper information unavailable
JP12
Unidentified
»
Factory configured - do not alter
JP21
Open
»
Factory configured - do not alter
JP22
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) 1M x 9
(4) 256K x 9
8MB
(4) 1M x 9
(4) 1M x 9
16MB
(4) 4M x 9
None
20MB
(4) 4M x 9
(4) 1M x 9
32MB
(4) 4M x 9
(4) 4M x 9
64MB
(4) 16M x 9
None

CACHE CONFIGURATION
Size
Bank 0
Bank 1
64KB
(4) 8K x 8
(4) 8K x 8
256KB
(4) 32K x 8
(4) 32K x 8
Note: The location of banks 0 & 1 are unidentified.

CACHE JUMPER CONFIGURATION
Size
JP3
JP4
JP17
JP18
64KB
Pins 2 & 3 closed
Pins 2 & 3 closed
Open
Open
128KB
Pins 1 & 2 closed
Pins 1 & 2 closed
Closed
Open
256KB
Pins 2 & 3 closed
Pins 2 & 3 closed
Closed
Closed

CPU SPEED SELECTION
Speed
JP5
JP6
JP7
25MHz
Open
Open
Closed
33MHz
Closed
Open
Open
40MHz
Closed
Closed
Open
50iMHz
Open
Open
Closed
50MHz
Open
Closed
Open
66iMHz
Closed
Open
Open

CPU TYPE SELECTION
Type
JP8
JP13
JP14
JP15
JP16
80486SX
2 & 3
Open
2 & 3
Open
Open
80486DX
2 & 3
1 & 2
1 & 2
Closed
Open
Note: Pins designated should be in the closed position. If PQFP is installed, JP8 must be set to 1 & 2 and JP16 must be closed if an 80486DX or 80486DX2 is installed

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HIGH PERFORMANCE 486 SX/DX (MODEL 2270) Motherboard Settings and Configuration

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Processor	80486SX/80486DX/80486DX2
Processor Speed	25/33/40/50/50(internal)/66(internal)MHz
Chip Set	Unidentified
Video Chip Set	None
Maximum Onboard Memory	64MB
Maximum Video Memory	None
Cache	64/256KB
BIOS	AMI
Dimensions	254mm x 218mm
I/O Options	32-bit VESA local bus slots (2)
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	J1	Turbo LED	JP20
Power LED & keylock	J20	Reset switch	S1
Speaker	JP9	32-bit VESA local bus slots	SL1 & SL2
Turbo switch	JP19

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	CMOS memory normal operation	JP1	Pins 2 & 3 closed
	CMOS memory clear	JP1	Pins 1 & 2 closed
	External battery installed at J1	JP1	Open
	Monitor type select monochrome/EGA	JP2	Open
	Monitor type select CGA	JP2	Closed
»	Factory configured - do not alter	JP10	Closed
	Jumper information unavailable	JP11	Unidentified
	Jumper information unavailable	JP12	Unidentified
»	Factory configured - do not alter	JP21	Open
»	Factory configured - do not alter	JP22	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) 1M x 9	(4) 256K x 9
8MB	(4) 1M x 9	(4) 1M x 9
16MB	(4) 4M x 9	None
20MB	(4) 4M x 9	(4) 1M x 9
32MB	(4) 4M x 9	(4) 4M x 9
64MB	(4) 16M x 9	None

CACHE CONFIGURATION
Size	Bank 0	Bank 1
64KB	(4) 8K x 8	(4) 8K x 8
256KB	(4) 32K x 8	(4) 32K x 8
Note: The location of banks 0 & 1 are unidentified.

CACHE JUMPER CONFIGURATION
Size	JP3	JP4	JP17	JP18
64KB	Pins 2 & 3 closed	Pins 2 & 3 closed	Open	Open
128KB	Pins 1 & 2 closed	Pins 1 & 2 closed	Closed	Open
256KB	Pins 2 & 3 closed	Pins 2 & 3 closed	Closed	Closed

CPU SPEED SELECTION
Speed	JP5	JP6	JP7
25MHz	Open	Open	Closed
33MHz	Closed	Open	Open
40MHz	Closed	Closed	Open
50iMHz	Open	Open	Closed
50MHz	Open	Closed	Open
66iMHz	Closed	Open	Open

CPU TYPE SELECTION
Type	JP8	JP13	JP14	JP15	JP16
80486SX	2 & 3	Open	2 & 3	Open	Open
80486DX	2 & 3	1 & 2	1 & 2	Closed	Open
Note: Pins designated should be in the closed position. If PQFP is installed, JP8 must be set to 1 & 2 and JP16 must be closed if an 80486DX or 80486DX2 is installed