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