JETPRO INFOTECH COMPANY, LTD.

MB-4F

Processor

80386DX/CX486DLC/80486SX/80487SX/80486DX/80486DX2

Processor Speed

20/25/33/40/50(internal)/66(internal)

Chip Set

FOREX

Max. Onboard DRAM

32MB

SRAM Cache

64/128/256KB

BIOS

AMI/AWARD

Dimensions

220mm x 340mm

I/O Options

None

NPU Options

80387

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

JP2

Turbo switch

JP15

Reset switch

JP8

Turbo LED

JP16

Power LED & keylock

JP14

Speaker

JP17

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Parity check enabled

JP5

closed

 

Parity check disabled

JP5

open

»

Monitor type select color

JP6

closed

 

Monitor type select monochrome

JP6

open

»

Factory configured - do not alter

JP19

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 TYPE CONFIGURATION

CPU

JP12

JP13

JP30

W1A-W1G

W2A-W2H

80486DX2

pins 1 & 2

pins 1 & 2

pins 1 & 2

pins 1 & 2

pins 1 & 2

80486DX

pins 1 & 2

pins 1 & 2

pins 1 & 2

pins 1 & 2

pins 1 & 2

80487SX

pins 1 & 2

pins 1 & 2

pins 2 & 3

pins 1 & 2

pins 1 & 2

80486SX

pins 2 & 3

pins 2 & 3

pins 2 & 3

pins 1 & 2

pins 1 & 2

80386DX

N/A

N/A

N/A

pins 2 & 3

pins 2 & 3

Note:Pins designated should be in the closed position.

SRAM CONFIGURATION

Size

Cache SRAM

Location

TAG(U26)

TAG(U42)

64KB

(8) 8K x 8

Banks 0 & 1

(1) 8K x 8

NONE

128KB

(4) 32K x 8

Bank 0

(1) 8K x 8

NONE

256KB

(8) 32K x 8

Banks 0 & 1

(1) 8K x 8

(1) 8K x 8

Note:The exact locations of U26 and U42 are unknown.

SRAM JUMPER CONFIGURATION

Size

JP8A

JP8B

JP8C

JP8D

JP8E

JP8F

64KB

pins 2 & 3

pins 2 & 3

pins 1 & 2

pins 2 & 3

pins 2 & 3

pins 1 & 2

128KB

pins 1 & 2

pins 2 & 3

pins 1 & 2

pins 1 & 2

pins 1 & 2

pins 1 & 2

256KB

pins 2 & 3

pins 1 & 2

pins 2 & 3

pins 2 & 3

pins 1 & 2

pins 2 & 3

Note:Pins designated should be in the closed position.