MECER CORPORATION

B830 (REV. B)

Processor	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	32-bit VESA local bus slots (2)
NPU Options	None

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	JP2	Turbo switch	JP15
Reset switch	JP3	Turbo LED	JP16
Power LED & keylock	JP9	Auxiliary keyboard connector	JP104
Speaker	JP10	32-bit VESA local bus slots	SL1 & SL2

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	Factory configured - do not alter	JP5	N/A
»	CMOS memory normal operation	JP6	Open
	CMOS memory clear	JP6	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	JP8A	JP8B	JP8D	JP8E
64KB	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed
128KB	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed
256KB	pins 2 & 3 closed	pins 1 & 2 closed	pins 2 & 3 closed	pins 1 & 2 closed

CPU TYPE CONFIGURATION
Type	JP12	JP13	JP29	JP30
80486SX (PQFP)	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed
80486SX (PGA)	pins 2 & 3 closed	pins 2 & 3 closed	pins 1 & 2 closed	pins 2 & 3 closed
80487SX	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed	pins 2 & 3 closed
80486DX (PQFP)	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed
80486DX (PGA)	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed
80486DX2	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed

CPU SPEED CONFIGURATION
Speed	JP7A	JP8B	JP7C
20MHz	pins 2 & 3 closed	pins 1 & 2 closed	pins 1 & 2 closed
25MHz	pins 1 & 2 closed	pins 2 & 3 closed	pins 1 & 2 closed
33MHz	pins 1 & 2 closed	pins 1 & 2 closed	pins 2 & 3 closed
40MHz	pins 2 & 3 closed	pins 2 & 3 closed	pins 1 & 2 closed
50iMHz	pins 1 & 2 closed	pins 2 & 3 closed	pins 1 & 2 closed
50MHz	pins 2 & 3 closed	pins 1 & 2 closed	pins 2 & 3 closed
66iMHz	pins 1 & 2 closed	pins 1 & 2 closed	pins 2 & 3 closed

VESA WAIT STATE CONFIGURATION
Wait states	JP102
0 wait states	pins 1 & 2 closed
1 wait state	pins 2 & 3 closed

BUS SPEED CONFIGURATION
CPU speed	JP103
<= 33MHz	pins 1 & 2 closed
> 33MHz	pins 2 & 3 closed

VESA BUS DELAY CONFIGURATION
Delay	JP105	JP106	JP107	JP108	JP109
Normal	Open	Open	1 & 2 , 4 & 5	Open	Open
1 delay	1 & 2	Open	2 & 3, 4 & 5	1 & 2	Open
2 delays	2 & 3	1 & 2	1 & 2, 3 & 4	2 & 3	Closed
3 delays	2 & 3	2 & 3	1 & 2, 3 & 4	2 & 3	Closed
Note: Pins designated should be in the closed position.

VESA CARD CONFIGURATION
Speed	JP110	JP111
Normal card installed	Closed	Closed
Weitek card installed	Open	Open

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B830 (REV. B), motherboard, processor, socket, pentium, pentium pro, celeron, powerpc, alpha, 8088, 8086, 286, 386, 486, configuration, RAM, DRAM, floppy, jumper, connections