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





A486-25/33/50C

ARNOS INSTRUMENTS & COMPUTER SYSTEMS, INC.

A486-25/33/50C

Processor

80486SX/80487SX/80486DX/80486DX2

Processor Speed

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

Chip Set

AIC

Max. Onboard DRAM

64MB

Cache

64/128/256/512/1024KB

BIOS

AMI/Phoenix

Dimensions

264mm x 219mm

I/O Options

None

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

X8

Turbo switch

X15

Reset switch

X13

Speaker

X16

Turbo LED

X14

Power LED & keylock

X17

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Battery select internal

S3

pins 1 & 2 closed

 

Battery select external

S3

pins 2 & 3 closed

Battery type select 5VDC or less

S4

pins 1 & 2 closed

 

Battery type select greater than 5VDC

S4

pins 2 & 3 closed

External cache enabled

S5

open

 

External cache disabled

S5

closed

CPU speed select iOSC/2

S7

pins 1 & 2 closed

 

CPU speed select iOSC/1

S7

pins 2 & 3 closed

Monitor type select color

S8

closed

 

Monitor type select monochrome

S8

open

CPU TYPE CONFIGURATION

CPU Type

S6

S9

80486DX2

pins 1 & 2 closed

pins 1 & 2 and 3 & 4 closed

80486DX

pins 1 & 2 closed

pins 1 & 2 and 3 & 4 closed

80487SX

pins 2 & 3 closed

pins 1 & 2 and 3 & 4 closed

80486SX

open

pins 2 & 3 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

64MB

(4) 16M x 9

NONE

CACHE JUMPER CONFIGURATION

Size

S1

S2

S10

S12

S13

64KB

pins 1 & 2

pins 1 & 2

pins 1 & 2

pins 1 & 2

pins 1 & 2

128KB

pins 2 & 3

pins 1 & 2

pins 2 & 3

pins 1 & 2

pins 2 & 3

256KB

pins 2 & 3

pins 1 & 2

pins 2 & 3

pins 2 & 3

pins 1 & 2

512KB

pins 2 & 3

pins 2 & 3

pins 2 & 3

pins 2 & 3

pins 1 & 2

1024KB

pins 2 & 3

pins 2 & 3

pins 2 & 3

pins 2 & 3

pins 2 & 3

Note:Pins designated should be in the closed position.

CACHE CONFIGURATION

Size

Cache

Location

TAG

64KB

(8) 8K x 8

Banks 0 & 1

(2) 8K x 8

128KB

(4) 32K x 8

Bank 0

(2) 8K x 8

256KB

(8) 32K x 8

Banks 0 & 1

(2) 32K x 8

512KB

(4) 128K x 8

Bank 0

(2) 32K x 8

1024KB

(8) 128K x 8

Banks 0 & 1

(2) 128K x 8