B800/B820 (REV. A) Motherboard Settings and Configuration

MECER CORPORATION

B800/B820 (REV. A)

Processor
80386DX/CX486DLC/80486SX/80487SX/80486DX/80486DX2
Processor Speed
20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set
Unidentified
Max. Onboard DRAM
32MB
Cache
64/128/256KB
BIOS
AMI
Dimensions
330mm x 218mm
I/O Options
None
NPU Options
80387DX

CONNECTIONS
Purpose
Location
Purpose
Location
External battery
JP2
Speaker
JP34 pins 6 - 10
External battery
JP31
Turbo LED
JP34 pins 11 - 15
Auxiliary keyboard connector
JP33
Turbo switch
JP34 pins 16 - 17
Power LED & keylock
JP34 pins 1 - 5
Reset switch
JP34 pins 19 - 20

USER CONFIGURABLE SETTINGS
Function
Jumper
Position
»
Monitor type select color
JP3
Open

Monitor type select monochrome
JP3
Closed
»
CMOS memory normal operation
JP6
pins 1 & 2 closed

CMOS memory clear
JP6
pins 2 & 3 closed
»
Factory configured - do not alter
JP20
N/A
»
Internal battery enabled
JP32
Closed

Internal battery disabled
JP32
Open
»
Factory configured - do not alter
JP41
N/A

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) 1M x 9
32MB
(4) 4M x 9
(4) 4M x 9

CACHE CONFIGURATION
Size
Bank 0
Bank 1
TG1
TG2
64KB
(4) 8K x 8
(4) 8K x 8
(1) 8K x 8
NONE
128KB
(4) 32K x 8
NONE
(1) 8K x 8
NONE
256KB
(4) 32K x 8
(4) 32K x 8
(1) 8K x 8
(1) 8K x 8

CACHE JUMPER CONFIGURATION (80386DX-40)
Size
JP8A
JP8B
JP8C
JP8E
JP8F
JP12
JP13
64KB
2 & 3
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
1 & 2
128KB
1 & 2
2 & 3
2 & 3
1 & 2
1 & 2
1 & 2
1 & 2
256KB
2 & 3
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80386DX-40 CON’T)
Size
JP30
JP40
W1A
W1B
W1C
W2A
W2C
64KB
1 & 2
1 & 2, 7 & 8
2 & 3
2 & 3
2 & 3
2 & 3
2 & 3
128KB
1 & 2
1 & 2, 7 & 8
2 & 3
2 & 3
2 & 3
2 & 3
2 & 3
256KB
1 & 2
1 & 2, 7 & 8
2 & 3
2 & 3
2 & 3
2 & 3
2 & 3
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80386DX-40 CON’T)
Size
W2D
W2E
W2G
W2H
W3A
W3B
W4
64KB
2 & 3
2 & 3
2 & 3
2 & 3
1 & 2
2 & 3
1 & 2
128KB
2 & 3
2 & 3
2 & 3
2 & 3
1 & 2
2 & 3
1 & 2
256KB
2 & 3
2 & 3
2 & 3
2 & 3
1 & 2
2 & 3
1 & 2
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (CX486DLC-33)
Size
JP8A
JP8B
JP8C
JP8E
JP8F
JP12
JP13
64KB
2 & 3
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
1 & 2
128KB
1 & 2
2 & 3
2 & 3
1 & 2
1 & 2
1 & 2
1 & 2
256KB
2 & 3
2 & 3
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (CX486DLC-33 CON’T)
Size
JP30
JP40
W1A
W1B
W1C
W2A
W2C
64KB
1 & 2
1 & 2, 5 & 6
2 & 3
1 & 2
2 & 3
2 & 3
2 & 3
128KB
1 & 2
1 & 2, 5 & 6
2 & 3
1 & 2
2 & 3
2 & 3
2 & 3
256KB
1 & 2
1 & 2, 5 & 6
2 & 3
1 & 2
2 & 3
2 & 3
2 & 3
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (CX486DLC-33 CON’T)
Size
W2D
W2E
W2G
W2H
W3A
W3B
W4
64KB
2 & 3
2 & 3
2 & 3
2 & 3
1 & 2
1 & 2
2 & 3
128KB
2 & 3
2 & 3
2 & 3
2 & 3
1 & 2
1 & 2
2 & 3
256KB
2 & 3
2 & 3
2 & 3
2 & 3
1 & 2
1 & 2
2 & 3
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80486SX-20)
Size
JP8A
JP8B
JP8C
JP8E
JP8F
JP12
JP13
JP30
64KB
2 & 3
1 & 2
1 & 2
2 & 3
1 & 2
2 & 3
2 & 3
2 & 3
128KB
1 & 2
2 & 3
2 & 3
1 & 2
1 & 2
2 & 3
2 & 3
2 & 3
256KB
2 & 3
1 & 2
1 & 2
1 & 2
2 & 3
2 & 3
2 & 3
2 & 3
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80486SX-20 CON’T)
Size
JP40
W1A
W1B
W1C
W2A
64KB
1 & 2, 3 & 4, 5 & 6, 7 & 8
1 & 2
1 & 2
1 & 2
1 & 2
128KB
1 & 2, 3 & 4, 5 & 6, 7 & 8
1 & 2
1 & 2
1 & 2
1 & 2
256KB
1 & 2, 3 & 4, 5 & 6, 7 & 8
1 & 2
1 & 2
1 & 2
1 & 2
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80486SX-20 CON’T)
Size
W2C
W2D
W2E
W2G
W2H
W3A
W3B
W4
64KB
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
128KB
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
256KB
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80486SX-25)
Size
JP8A
JP8B
JP8C
JP8E
JP8F
JP12
JP13
64KB
2 & 3
1 & 2
1 & 2
2 & 3
1 & 2
2 & 3
2 & 3
128KB
1 & 2
2 & 3
2 & 3
1 & 2
1 & 2
2 & 3
2 & 3
256KB
2 & 3
1 & 2
1 & 2
1 & 2
2 & 3
2 & 3
2 & 3
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80486SX-25 CON’T)
Size
JP30
JP40
W1A
W1B
W1C
W2A
W2C
64KB
2 & 3
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
128KB
2 & 3
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
256KB
2 & 3
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80486SX-25 CON’T)
Size
W2D
W2E
W2G
W2H
W3A
W3B
W4
64KB
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
128KB
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
256KB
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80487SX-20)
Size
JP8A
JP8B
JP8C
JP8E
JP8F
JP12
JP13
JP30
64KB
2 & 3
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
1 & 2
2 & 3
128KB
1 & 2
2 & 3
2 & 3
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
256KB
2 & 3
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
2 & 3
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80487SX-20 CON’T)
Size
JP40
W1A
W1B
W1C
W2A
64KB
1 & 2, 3 & 4, 5 & 6, 7 & 8
1 & 2
1 & 2
1 & 2
1 & 2
128KB
1 & 2, 3 & 4, 5 & 6, 7 & 8
1 & 2
1 & 2
1 & 2
1 & 2
256KB
1 & 2, 3 & 4, 5 & 6, 7 & 8
1 & 2
1 & 2
1 & 2
1 & 2
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80487SX-20 CON’T)
Size
W2C
W2D
W2E
W2G
W2H
W3A
W3B
W4
64KB
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
128KB
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
256KB
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80486DX-33)
Size
JP8A
JP8B
JP8C
JP8E
JP8F
JP12
JP13
64KB
2 & 3
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
1 & 2
128KB
1 & 2
2 & 3
2 & 3
1 & 2
1 & 2
1 & 2
1 & 2
256KB
2 & 3
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80486DX-33 CON’T)
Size
JP30
JP40
W1A
W1B
W1C
W2A
W2C
64KB
1 & 2
5 & 6
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
128KB
1 & 2
5 & 6
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
256KB
1 & 2
5 & 6
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80486DX-33 CON’T)
Size
W2D
W2E
W2G
W2H
W3A
W3B
W4
64KB
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
128KB
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
256KB
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80486DX-50)
Size
JP8A
JP8B
JP8C
JP8E
JP8F
JP12
JP13
64KB
2 & 3
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
1 & 2
128KB
1 & 2
2 & 3
2 & 3
1 & 2
1 & 2
1 & 2
1 & 2
256KB
2 & 3
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80486DX-50 CON’T)
Size
JP30
JP40
W1A
W1B
W1C
W2A
W2C
64KB
1 & 2
Open
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
128KB
1 & 2
Open
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
256KB
1 & 2
Open
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80486DX-50 CON’T)
Size
W2D
W2E
W2G
W2H
W3A
W3B
W4
64KB
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
128KB
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
256KB
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80486DX2-50)
Size
JP8A
JP8B
JP8C
JP8E
JP8F
JP12
JP13
64KB
2 & 3
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
1 & 2
128KB
1 & 2
2 & 3
2 & 3
1 & 2
1 & 2
1 & 2
1 & 2
256KB
2 & 3
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80486DX2-50 CON’T)
Size
JP30
JP40
W1A
W1B
W1C
W2A
W2C
64KB
1 & 2
5 & 6, 7 & 8
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
128KB
1 & 2
5 & 6, 7 & 8
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
256KB
1 & 2
5 & 6, 7 & 8
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80486DX2-50 CON’T)
Size
W2D
W2E
W2G
W2H
W3A
W3B
W4
64KB
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
128KB
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
256KB
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80486DX2-66)
Size
JP8A
JP8B
JP8C
JP8E
JP8F
JP12
JP13
64KB
2 & 3
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
1 & 2
128KB
1 & 2
2 & 3
2 & 3
1 & 2
1 & 2
1 & 2
1 & 2
256KB
2 & 3
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80486DX2-66 CON’T)
Size
JP30
JP40
W1A
W1B
W1C
W2A
W2C
64KB
1 & 2
5 & 6
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
128KB
1 & 2
5 & 6
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
256KB
1 & 2
5 & 6
1 & 2
1 & 2
1 & 2
1 & 2
1 & 2
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80486DX2-66 CON’T)
Size
W2D
W2E
W2G
W2H
W3A
W3B
W4
64KB
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
128KB
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
256KB
1 & 2
1 & 2
1 & 2
1 & 2
2 & 3
1 & 2
1 & 2
Note: Pins designated should be in the closed position.

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B800/B820 (REV. A) Motherboard Settings and Configuration

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Processor	80386DX/CX486DLC/80486SX/80487SX/80486DX/80486DX2
Processor Speed	20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set	Unidentified
Max. Onboard DRAM	32MB
Cache	64/128/256KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	None
NPU Options	80387DX

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	JP2	Speaker	JP34 pins 6 - 10
External battery	JP31	Turbo LED	JP34 pins 11 - 15
Auxiliary keyboard connector	JP33	Turbo switch	JP34 pins 16 - 17
Power LED & keylock	JP34 pins 1 - 5	Reset switch	JP34 pins 19 - 20

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Monitor type select color	JP3	Open
	Monitor type select monochrome	JP3	Closed
»	CMOS memory normal operation	JP6	pins 1 & 2 closed
	CMOS memory clear	JP6	pins 2 & 3 closed
»	Factory configured - do not alter	JP20	N/A
»	Internal battery enabled	JP32	Closed
	Internal battery disabled	JP32	Open
»	Factory configured - do not alter	JP41	N/A

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) 1M x 9
32MB	(4) 4M x 9	(4) 4M x 9

CACHE CONFIGURATION
Size	Bank 0	Bank 1	TG1	TG2
64KB	(4) 8K x 8	(4) 8K x 8	(1) 8K x 8	NONE
128KB	(4) 32K x 8	NONE	(1) 8K x 8	NONE
256KB	(4) 32K x 8	(4) 32K x 8	(1) 8K x 8	(1) 8K x 8

CACHE JUMPER CONFIGURATION (80386DX-40)
Size	JP8A	JP8B	JP8C	JP8E	JP8F	JP12	JP13
64KB	2 & 3	1 & 2	1 & 2	2 & 3	1 & 2	1 & 2	1 & 2
128KB	1 & 2	2 & 3	2 & 3	1 & 2	1 & 2	1 & 2	1 & 2
256KB	2 & 3	1 & 2	1 & 2	1 & 2	2 & 3	1 & 2	1 & 2
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80386DX-40 CON’T)
Size	JP30	JP40	W1A	W1B	W1C	W2A	W2C
64KB	1 & 2	1 & 2, 7 & 8	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
128KB	1 & 2	1 & 2, 7 & 8	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
256KB	1 & 2	1 & 2, 7 & 8	2 & 3	2 & 3	2 & 3	2 & 3	2 & 3
Note: Pins designated should be in the closed position.

CACHE JUMPER CONFIGURATION (80386DX-40 CON’T)
Size	W2D	W2E	W2G	W2H	W3A	W3B	W4
64KB	2 & 3	2 & 3	2 & 3	2 & 3	1 & 2	2 & 3	1 & 2
128KB	2 & 3	2 & 3	2 & 3	2 & 3	1 & 2	2 & 3	1 & 2
256KB	2 & 3	2 & 3	2 & 3	2 & 3	1 & 2	2 & 3	1 & 2
Note: Pins designated should be in the closed position.