...because we can't all be on the bleeding edge...





486 LOCAL BUS MAINBOARD

ATEN RESEARCH, INC.

486 LOCAL BUS MAINBOARD

Processor

80486SX/80486DX/80486DX2

Processor Speed

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

Chip Set

OPTI

Max. Onboard DRAM

64MB

Cache

64/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit local bus card slot

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J2 pins 1 & 4

Speaker

J6

Turbo switch

J3

Power LED & keylock

J7

Reset switch

J4

32-bit local bus card

S1

Turbo LED

J5

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Battery type select internal

J2

pins 2 & 3 closed

 

Battery type select external

J2

pins 1 & 4 connected

Monitor type select color

JP1

closed

 

Monitor type select monochrome

JP1

open

CMOS memory normal operation

JP2

pins 1 & 2 closed

 

CMOS memory clear

JP2

pins 2 & 3 closed

VGA card type select ISA

JP3

JP4

pins 1 & 2 closed

pins 1 & 2 closed

 

VGA card type select local bus with ET 4000 chipset

JP3

JP4

pins 2 & 3 closed

pins 2 & 3 closed

 

VGA card type select local bus with S3 chipset

JP3

JP4

pins 2 & 3 closed

pins 1 & 2 closed

I/O Bus speed select ATCLK/4

JP5

open

 

I/O Bus speed select ATCLK/6

JP5

closed

CPU speed select iOSC/2

JP9

pins 2 & 3 closed

 

CPU speed select iOSC/1

JP9

pins 1 & 2 closed

CPU CONFIGURATION

CPU Type

JP6

JP7

JP8

80486DX2

pins 1 & 2 closed

pins 2 & 3 closed

closed

80486DX

pins 1 & 2 closed

pins 2 & 3 closed

closed

80486SX

pins 2 & 3 closed

open

open

SRAM JUMPER CONFIGURATION

Size

JP10

JP11

JP12

JP13

64KB

open

open

open

open

256KB

closed

closed

open

closed

SRAM CONFIGURATION

Size

Cache SRAM

TAG (U46)

TAG (U47)

64KB

(8) 8K x 8

(1) 64K x 1

(1) 8K x 8

256KB

(8) 32K x 8

(1) 64K x 1

(1) 32K x 8

Note:Locations of U46 and U47 are unknown.

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(4) 256K x 9

NONE

NONE

NONE

2MB

(4) 256K x 9

(4) 256K x 9

NONE

NONE

3MB

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

NONE

4MB

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

5MB

(4) 1M x 9

(4) 256K x 9

NONE

NONE

6MB

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

NONE

7MB

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

8MB

(4) 1M x 9

(4) 1M x 9

NONE

NONE

9MB

(4) 256K x 9

(4) 1M x 9

(4) 1M x 9

NONE

10MB

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

(4) 1M x 9

12MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

NONE

13MB

(4) 256K x 9

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

16MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

NONE

NONE

20MB

(4) 1M x 9

(4) 4M x 9

NONE

NONE

24MB

(4) 1M x 9

(4) 1M x 9

(4) 4M x 9

NONE

28MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

(4) 4M x 9

32MB

(4) 4M x 9

(4) 4M x 9

NONE

NONE

36MB

(4) 1M x 9

(4) 4M x 9

(4) 4M x 9

NONE

40MB

(4) 1M x 9

(4) 1M x 9

(4) 4M x 9

(4) 4M x 9

48MB

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

NONE

52MB

(4) 1M x 9

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

64MB

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9