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GMB-486UNL

ROBOTECH, INC.

GMB-486UNL

Processor

80486SX/80487SX/80486DX/80486DX2

Processor Speed

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

Chip Set

Toshiba

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

260mm x 220mm

I/O Options

32-bit VESA local bus slots (3)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J4

Turbo switch

JP17

Power LED & keylock

J5

Reset switch

JP18

Speaker

J6

32-bit VESA local bus slots

SL1 - SL3

Turbo LED

JP16

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Monitor type select color

JP1

Closed

 

Monitor type select monochrome

JP1

Open

CMOS memory normal operation

JP2

pins 2 & 3 closed

 

CMOS memory clear

JP2

pins 1 & 2 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

20MB

(4) 4M x 9

(4) 1M x 9

32MB

(4) 4M x 9

(4) 4M x 9

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

32KB

(4) 8K x 8

NONE

(1) 8K x 8

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

JP6

JP7

JP9

JP11

32KB

Open

Open

Open

pins 2 & 3 closed

64KB

Open

Closed

Open

pins 1 & 2 closed

128KB

Open

Closed

Closed

pins 1 & 2, 3 & 4 closed

256KB

Closed

Closed

Closed

pins 1 & 2, 4 & 5 closed

CPU TYPE CONFIGURATION

Type

JP4

80486SX

pins 5 & 6 closed

80487SX

pins 2 & 3, 4 & 5, 6 & 7 closed

80486DX/DX2

pins 1 & 2, 4 & 5, 6 & 7 closed

CPU SPEED CONFIGURATION

Speed

JP29

JP30

JP31

25MHz

Closed

Open

Closed

33MHz

Closed

Closed

Open

40MHz

Open

Open

Closed

50iMHz

Closed

Open

Closed

50MHz

Open

Closed

Open

66iMHz

Closed

Closed

Open

VESA CLOCK SPEED CONFIGURATION

CPU speed

JP43

Same phase as CPU

pins 2 & 3 closed

Same phase as Toshiba U4800 chipset

pins 1 & 2 closed

BUS SPEED CONFIGURATION

CPU speed

JP19

<=33MHz

Open

>33MHz

Closed

VESA WAIT STATE CONFIGURATION

Wait states

JP20

0 wait states

Open

1 wait state

Closed

VESA MASTER/SLAVE CONFIGURATION

Setting

JP40

JP41

JP42

JP44

JP45

PAL/GAL installed

Open

Open

Open

pins 1 & 2 closed

pins 2 & 3 closed

PAL/GAL not installed

Closed

Closed

Closed

pins 2 & 3 closed

pins 2 & 3 closed