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486DX-25/33, 486SX-20

PEAKTRON COMPUTER, INC.

486DX-25/33, 486SX-20

Processor

80486SX/80486DX

Processor Speed

20/25/33MHz

Chip Set

Peaktron

Max. Onboard DRAM

32MB

Cache

None

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Reset switch

J1

Speaker

J4

Turbo switch

J2

Power LED & Keylock

J5

Turbo LED

J3

External battery

JP4

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

Parity check enabled

J6

Closed

 

Parity check disabled

J6

Open

Factory configured - do not alter

J8

N/A

Monitor type select monochrome

J10

Open

 

Monitor type select color

J10

Closed

CPU speed select switchable at turbo switch

JP1

pins 1 & 2 closed

 

CPU speed select forced fast

JP1

pins 2 & 3 closed

 

CPU speed select forced slow

JP1

Open

Factory configured - do not alter

JP5

N/A

20/25MHz CPU using 70ns DRAM or33MHz CPU using 60ns

JP6

Open

 

20/25MHz CPU using 60ns DRAM

JP6

Closed

Shadow BIOS disabled

SW1/5

Closed

 

Shadow BIOS enabled

SW1/5

Open

Bus speed select ATCLK/3

SW1/6

Open

 

Bus speed select ATCLK/4

SW1/6

Closed

Note:Location of JP6 is unverified. If using 8 bit SIMMs, J6 must be open.

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

32MB

(4) 4M x 9

(4) 4M x 9

DRAM JUMPER CONFIGURATION

Size

SW1/1

SW1/2

SW1/3

SW1/4

1MB

Closed

Open

Open

Closed

2MB

Open

Open

Open

Closed

4MB

Closed

Closed

Open

Open

5MB

Open

Closed

Open

Closed

8MB

Open

Closed

Open

Open

16MB

Closed

Open

Open

Open

20MB

Open

Open

Closed

Open

32MB

Open

Open

Open

Open

CPU TYPE CONFIGURATION

Type

JP2

JP3

80486SX

pins 2 & 3 closed

Open

80486DX

pins 1 & 2 closed

Closed

BIOS CONFIGURATION

Type

J7

J9

27256

Open

pins 1 & 2 closed

27512

Closed

pins 2 & 3 closed