GIGA-BYTE TECHNOLOGY CO., LTD

GA-386UM 33/40 MAIN BOARD

Processor

80386DX

Processor Speed

33/40MHz

Chip Set

OPTI

Max. Onboard DRAM

32MB

SRAM Cache

64/128/256KB

BIOS

AMI

Dimensions

220mm x 260mm

I/O Options

None

NPU Options

80387/3167

CONNECTIONS

Purpose

Location

Purpose

Location

Power LED & keylock

J1

Turbo switch

J4

Speaker

J2

Turbo LED

J5

Reset switch

J3

External battery

J11

Note:Board may be supplied with either a PGA (socketed) or PQFP (surface mounted) CPU.

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

NPU absent

J7

open

 

NPU present

J7

closed

»

Monitor type select color

J8

closed

 

Monitor type select monochrome

J8

open

»

CMOS memory normal operation

J9

pins 2 & 3 closed

 

CMOS memory clear

J9

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

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

32MB

(4) 4M x 9

(4) 4M x 9

SRAM CONFIGURATION

Size

Cache SRAM

Location

TAG

64KB

(8) 8K x 8

Banks 0 & 1

(1) 8K x 8

128KB

(4) 32K x 8

Bank 0

(1) 8K x 8

256KB

(8) 32K x 8

Banks 0 & 1

(1) 32K x 8

SRAM JUMPER CONFIGURATION

Size

WC1

WC2

WC3

WC4

WC5

64KB

pins 2 & 3 closed

open

open

pins 1 & 2 closed

pins 1 & 2 closed

128KB

pins 1 & 2 closed

open

closed

pins 2 & 3 closed

pins 1 & 2 closed

256KB

pins 2 & 3 closed

closed

closed

pins 2 & 3 closed

pins 2 & 3 closed