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





486-25C/33C

ARNOS INSTRUMENTS & COMPUTER SYSTEMS COMPANY, INC.

486-25C/33C

Processor

80486DX

Processor Speed

25/33MHz

Chip Set

None

Max. Onboard DRAM

32MB

Cache

128KB

BIOS

Phoenix

Dimensions

355mm x 304mm

I/O Options

None

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

X4

Status display

X15

Turbo switch

X12

Reset switch

X16

Speaker

X13

Power LED & keylock

X17

Turbo LED

X14

 

 

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

Factory configured - do not alter

S1

pins 1 & 2 closed

Battery installed < 5VDC

S2

pins 1 & 2 closed

 

Battery installed > 5VDC

S2

pins 2 & 3 closed

CPU speed select switchable at keyboard

S3

pins 2 & 3 closed

 

CPU speed select switchable at turbo switch

S3

pins 1 & 2 closed

Factory configured - do not alter

SW1/1

N/A

NPU disabled

SW1/2

Off

 

NPU enabled

SW1/2

On

Factory configured - do not alter

SW1/3

N/A

Monitor type select monochrome

SW1/4

Off

 

Monitor type select color

SW1/4

On

Factory configured - do not alter

TP1

Off

Factory configured - do not alter

TP2

Off

Factory configured - do not alter

TP3

Off

Factory configured - do not alter

TP4

Off

Note: The location of S1 is unidentified.

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

4MB 2

(4) 1M x 9

NONE

NONE

NONE

8MB 2

(4) 1M x 9

(4) 1M x 9

NONE

NONE

12MB 2

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

NONE

16MB 1

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

16MB 2

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

16MB 1

(4) 4M x 9

NONE

NONE

NONE

16MB 2

(4) 4M x 9

NONE

NONE

NONE

20MB 2

(4) 4M x 9

(4) 1M x 9

NONE

NONE

24MB 2

(4) 4M x 9

(4) 1M x 9

(4) 1M x 9

NONE

28MB 2

(4) 4M x 9

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

32MB 1

(4) 4M x 9

(4) 4M x 9

NONE

NONE

Note 1: These memory configurations do not utilize 256KB remapping.

Note 2: These memory configurations utilize 256KB memory remapping.

Due to remapping, system memory count on boot-up will reflect 256KB less than actual.

DRAM SWITCH CONFIGURATION

Size

SW1/5

SW1/6

SW1/ 7

SW1/8

4MB 2

On

On

On

On

8MB 2

On

On

On

Off

12MB 2

On

On

Off

On

16MB 1

On

On

Off

Off

16MB 2

On

Off

On

Off

16MB 1

On

Off

Off

On

16MB 2

On

Off

Off

Off

20MB 2

Off

On

On

On

24MB 2

Off

On

Off

On

28MB 2

Off

On

Off

Off

32MB 1

Off

Off

On

On

Note 1: These memory configurations do not utilize 256KB remapping.

Note 2: These memory configurations utilize 256KB-memory remapping.

Due to remapping, system memory count on boot-up will reflect 256KB less than actual.

CACHE CONFIGURATION

Size

Bank 0

TAG

128KB

(16) 8K x 8

(2) 8K x 8