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486SX-16/20/25UCE Motherboard Settings and Configuration






DIAMOND FLOWER, INC.

486SX-16/20/25UCE

Processor

80486SX/80487SX

Processor Speed

16/20/25MHz

Chip Set

UMC

Max. Onboard DRAM

32MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

330mm x 220mm

I/O OPTIONS

32-bit external memory card slot

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Keyboard connector

J1

Turbo switch

J8 and J17

Speaker

J2

Power LED & Keylock

J9

Turbo LED

J3

External battery

J18

Reset switch

J5 and J14

32-bit external memory card

S1

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Factory configured - do not alter

J4

open

Factory configured - do not alter

J6

pins 2 & 3 closed

 

CPU speed select 16/25MHz

J7

open

 

CPU speed select 20MHz

J7

closed

Battery select internal

J16

pins 2 & 3 closed

 

Battery select external

J16

pins 1 & 2 closed

Factory configured - do not alter

J19

open

Monitor type select color

J20

closed

 

Monitor type select monochrome

J20

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

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

Jumper

64KB

128KB

256KB

W1

open

closed

closed

W2

open

closed

closed

W3

closed

closed

closed

W4

open

open

closed

W5

open

open

closed

J10

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

J11

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

J12

open

pins 1 & 2 closed

pins 2 & 3 closed

J13

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed

J15

closed

closed

closed








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