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80486-33B

UNIDENTIFIED

80486-33B

Processor

80486SX/80487SX/80486DX

Processor Speed

33MHz

Chip Set

OPTI

Max. Onboard DRAM

32MB

SRAM Cache

64/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J11

Turbo LED

JP11

Power LED & keylock

J20

Reset switch

SW1

Speaker

J21

Turbo switch

SW2

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

 

CMOS memory normal operation

JP1

pins 2 & 3 closed

 

CMOS memory clear

JP1

pins 1 & 2 closed

Monitor type select color

JP2

closed

 

Monitor type select monochrome

JP2

open

 

Factory configured - do not alter

JP6

closed

CPU speed select iOSC(Y2)/2

JP7

pins 2 & 3 closed

 

CPU speed select iOSC(Y2)/1

JP7

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

SRAM CONFIGURATION

Size

Cache SRAM

TAG

JP9

JP10

JP12

64KB

(8) 8K x 8

(1) 8K x 8

open

open

open

256KB

(8) 32K x 8

(1) 32K x 8

closed

closed

closed

CPU JUMPER CONFIGURATION

CPU

JP3

JP4

JP5

80486DX

pins 2 & 3 closed

closed

pins 1 & 2 closed

80487SX

pins 1 & 2 closed

closed

pins 1 & 2 closed

80486SX

open

open

pins 2 & 3 closed