Processor

80486SX/80487SX/80486DX/80486DX2

Processor Speed

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

Chip Set

VLSI

Max. Onboard DRAM

256MB

SRAM Cache

64/256KB

BIOS

AMI

Dimensions

330.2mm x 218.4mm

I/O Options

32-bit external CPU/NPU card slot, 32-bit external video card slot

NPU Options

4167 (on external CPU/NPU card)

CONNECTIONS

Purpose

Location

Purpose

Location

Reset switch

J1

32-bit external video card

S1

Speaker

J2

32-bit NPU/CPU card

S2

Power LED & keylock

J3

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Factory configured - do not alter

JP1

pins 2 & 3 closed

»

Factory configured - do not alter

JP2

pins 2 & 3 closed

»

Factory configured - do not alter

JP3

open

»

Factory configured - do not alter

JP5

closed

»

Factory configured - do not alter

JP6

closed

»

Monitor type select color

JP7

closed

Monitor type select monochrome

JP7

open

»

Video adapter select normal

JP9

pins 1 & 2 closed

Video adapter select local bus

JP9

pins 2 & 3 closed

»

Factory configured - do not alter

JP11

pins 2 & 3 closed

»

Factory configured - do not alter

JP12

pins 2 & 3 closed

CPU JUMPER CONFIGURATION (MAIN BOARD)

CPU

JP4

JP8

JP10

80486DX2-66

pins 1 & 2 closed

pins 1 & 2 closed

closed

80486DX2-50

pins 1 & 2 closed

pins 2 & 3 closed

closed

ODP487SX-50

pins 1 & 2 closed

pins 2 & 3 closed

closed

80486DX-50

pins 1 & 2 closed

pins 2 & 3 closed

closed

80486DX-33

pins 1 & 2 closed

pins 2 & 3 closed

closed

80486SX-25

pins 1 & 2 closed

pins 2 & 3 closed

closed

80486SX-20

pins 2 & 3 closed

pins 2 & 3 closed

open

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

4MB

(1) 1M x 36

NONE

NONE

NONE

8MB

(1) 1M x 36

(1) 1M x 36

NONE

NONE

12MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

NONE

16MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

16MB

(1) 4M x 36

NONE

NONE

NONE

20MB

(1) 1M x 36

(1) 4M x 36

NONE

NONE

24MB

(1) 1M x 36

(1) 1M x 36

(1) 4M x 36

NONE

32MB

(1) 4M x 36

(1) 4M x 36

NONE

NONE

36MB

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

NONE

40MB

(1) 1M x 36

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

40MB

(1) 1M x 36

(1) 4M x 36

(1) 4M x 36

(1) 1M x 36

64MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

64MB

(1) 16M x 36

NONE

NONE

NONE

128MB

(1) 16M x 36

(1) 16M x 36

NONE

NONE

192MB

(1) 16M x 36

(1) 16M x 36

(1) 16M x 36

NONE

256MB

(1) 16M x 36

(1) 16M x 36

(1) 16M x 36

(1) 16M x 36

CPU JUMPER CONFIGURATION

CPU

JP1

JP2

JP3

JP4

80486DX2-66 1

pins 1 & 2 and 3 & 4 closed

closed

closed

closed

ODP487SX-50 1

pins 2 & 3 closed

open

closed

closed

80486DX-50

pins 1 & 2 and 3 & 4 closed

closed

open

open

80486DX-33

pins 1 & 2 and 3 & 4 closed

closed

closed

closed

80486SX-25

pins 2 & 3 closed

open

closed

closed

80486SX-20

pins 2 & 3 closed

open

closed

closed

Note 1 :Speeds indicated are the internal speeds of the CPU.

CPU SWITCH CONFIGURATION

CPU

SW1/switch 1

SW1/switch 2

SW1/switch 3

SW1/switch 4

80487SX

closed

open

closed

open

ODP487SX

closed

open

closed

open

80486DX2

open

closed

open

closed

SRAM JUMPER CONFIGURATION

Size

JP5

JP6

JP7

JP8

64KB

open

open

open

open

256KB

closed

closed

closed

closed

SRAM CONFIGURATION

Size

Cache SRAM

TAG (U1)

TAG (U9)

64KB

(8) 8K x 8

(1) 16K x 1

(1) 8K x 9

256KB

(8) 32K x 8

(1) 64K x 1

(1) 32K x 9