MB-6U(MB-450CBU) Motherboard Settings and Configuration

JETPRO INFOTECH COMPANY, LTD.

MB-6U(MB-450CBU)

Processor
80386DX/80486SX/80487SX/80486DX/80486DX2
Processor Speed
20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set
UMC
Max. Onboard DRAM
64MB
SRAM Cache
64/256KB
BIOS
AMI
Dimensions
330mm x 218mm
I/O Options
32-bit proprietary local bus card
NPU Options
80387/3167

CONNECTIONS
Purpose
Location
Purpose
Location
Reset switch
J5
Power LED & keylock
J9
Turbo LED
J6
External battery
J11
Turbo switch
J7
32-bit proprietary local bus card
S1
Speaker
J8

USER CONFIGURABLE SETTINGS
Function
Jumper
Position
»
CMOS memory normal operation
W1
closed

CMOS memory clear
W1
open
»
Monitor type select color
W2
closed

Monitor type select monochrome
W2
open
»
Factory configured-do not alter
W3
open
»
Tag mode select write back enabled (tag installed at U45)
W15
open

Tag mode select write back disabled (tag not installed at U45)
W15
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) 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

CPU JUMPER CONFIGURATION
Size
OSC2
W5
W10
W11
W19
W22
80386DX/25
50MHz
open
N/A
N/A
open
N/A
80386DX/33
66MHz
open
N/A
N/A
open
N/A
80386DX/40
80MHz
open
N/A
N/A
open
N/A
80486SX/20
20MHz
open
open
pins 1 & 2
closed
1 & 2 and 3 & 4
80486SX/20
40MHz
open
open
pins 2 & 3
closed
1 & 2 and 3 & 4
80487SX/20
20MHz
closed
pins 2 & 3
pins 1 & 2
closed
1 & 2 and 3 & 4
80487SX/20
40MHz
closed
pins 2 & 3
pins 2 & 3
closed
1 & 2 and 3 & 4
80486DX/25
25MHz
open
pins 1 & 2
pins 1 & 2
closed
1 & 2 and 3 & 4
80486DX/25
50MHz
open
pins 1 & 2
pins 2 & 3
closed
1 & 2 and 3 & 4
80486DX/33
33MHz
open
pins 1 & 2
pins 1 & 2
closed
1 & 2 and 3 & 4
80486DX/33
66MHz
open
pins 1 & 2
pins 2 & 3
closed
1 & 2 and 3 & 4
80486DX/50
50MHz
open
pins 1 & 2
pins 1 & 2
closed
1 & 2 and 3 & 4
Note:Pins designated should be in the closed position

NPU JUMPER CONFIGURATION
Size
W8
W20
80387
closed
closed
3167
open
open

SRAM JUMPER CONFIGURATION
Jumper
32KB
64KB
128KB
256KB
W12
pins 1 & 2 closed
pins 2 & 3 closed
pins 2 & 3 closed
pins 2 & 3 closed
W13
pins 1 & 2 closed
pins 1 & 2 closed
pins 2 & 3 closed
pins 2 & 3 closed
W14
pins 1 & 2 closed
pins 1 & 2 closed
pins 1 & 2 closed
pins 2 & 3 closed
W15
open
open
open
open
W17
pins 2 & 3 closed
pins 1 & 2 closed
pins 2 & 3 closed
pins 1 & 2 closed
W18
N/A
N/A
pins 1 & 2 closed
pins 2 & 3 closed

SRAM CONFIGURATION
Size
Cache
Locations
TAG
32KB
(4) 8K x 8
Bank 0
(4) 16K x 4
64KB
(8) 8K x 8
Banks 0 & 1
(4) 16K x 4
128KB
(4) 32K x 8
Bank 0
(4) 16K x 4
256KB
(8) 32K x 8
Banks 0 & 1
(4) 16K x 4

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Processor	80386DX/80486SX/80487SX/80486DX/80486DX2
Processor Speed	20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set	UMC
Max. Onboard DRAM	64MB
SRAM Cache	64/256KB
BIOS	AMI
Dimensions	330mm x 218mm
I/O Options	32-bit proprietary local bus card
NPU Options	80387/3167

CONNECTIONS
Purpose	Location	Purpose	Location
Reset switch	J5	Power LED & keylock	J9
Turbo LED	J6	External battery	J11
Turbo switch	J7	32-bit proprietary local bus card	S1
Speaker	J8

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	CMOS memory normal operation	W1	closed
	CMOS memory clear	W1	open
»	Monitor type select color	W2	closed
	Monitor type select monochrome	W2	open
»	Factory configured-do not alter	W3	open
»	Tag mode select write back enabled (tag installed at U45)	W15	open
	Tag mode select write back disabled (tag not installed at U45)	W15	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) 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

CPU JUMPER CONFIGURATION
Size	OSC2	W5	W10	W11	W19	W22
80386DX/25	50MHz	open	N/A	N/A	open	N/A
80386DX/33	66MHz	open	N/A	N/A	open	N/A
80386DX/40	80MHz	open	N/A	N/A	open	N/A
80486SX/20	20MHz	open	open	pins 1 & 2	closed	1 & 2 and 3 & 4
80486SX/20	40MHz	open	open	pins 2 & 3	closed	1 & 2 and 3 & 4
80487SX/20	20MHz	closed	pins 2 & 3	pins 1 & 2	closed	1 & 2 and 3 & 4
80487SX/20	40MHz	closed	pins 2 & 3	pins 2 & 3	closed	1 & 2 and 3 & 4
80486DX/25	25MHz	open	pins 1 & 2	pins 1 & 2	closed	1 & 2 and 3 & 4
80486DX/25	50MHz	open	pins 1 & 2	pins 2 & 3	closed	1 & 2 and 3 & 4
80486DX/33	33MHz	open	pins 1 & 2	pins 1 & 2	closed	1 & 2 and 3 & 4
80486DX/33	66MHz	open	pins 1 & 2	pins 2 & 3	closed	1 & 2 and 3 & 4
80486DX/50	50MHz	open	pins 1 & 2	pins 1 & 2	closed	1 & 2 and 3 & 4
Note:Pins designated should be in the closed position

NPU JUMPER CONFIGURATION
Size	W8	W20
80387	closed	closed
3167	open	open

SRAM JUMPER CONFIGURATION
Jumper	32KB	64KB	128KB	256KB
W12	pins 1 & 2 closed	pins 2 & 3 closed	pins 2 & 3 closed	pins 2 & 3 closed
W13	pins 1 & 2 closed	pins 1 & 2 closed	pins 2 & 3 closed	pins 2 & 3 closed
W14	pins 1 & 2 closed	pins 1 & 2 closed	pins 1 & 2 closed	pins 2 & 3 closed
W15	open	open	open	open
W17	pins 2 & 3 closed	pins 1 & 2 closed	pins 2 & 3 closed	pins 1 & 2 closed
W18	N/A	N/A	pins 1 & 2 closed	pins 2 & 3 closed

SRAM CONFIGURATION
Size	Cache	Locations	TAG
32KB	(4) 8K x 8	Bank 0	(4) 16K x 4
64KB	(8) 8K x 8	Banks 0 & 1	(4) 16K x 4
128KB	(4) 32K x 8	Bank 0	(4) 16K x 4
256KB	(8) 32K x 8	Banks 0 & 1	(4) 16K x 4