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





JET-486DX/SX 20/25 NON-CACHE

J-MARK COMPUTER CORPORATION

JET-486DX/SX 20/25 NON-CACHE

Processor

80486SX/80486DX

Processor Speed

20/25/33MHz

Chip Set

ETEQ

Max. Onboard DRAM

32MB

Cache

None

BIOS

AMI

Dimensions

220mm x 220mm

I/O Options

None

NPU Options

80487SX

CONNECTIONS

Purpose

Location

Purpose

Location

Reset switch

J1

Turbo switch

J4

Power LED & keylock

J2

External battery

JP1

Speaker

J3

Turbo LED

JP5

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Monitor type select color

JP2

Closed

 

Monitor type select monochrome

JP2

Open

CMOS memory normal operation

JP3

Closed

 

CMOS memory clear

JP3

Open

Factory configured - do not alter

JP12

Closed

Oscillator speed select 25MHz

JP13

pins 1 & 2 closed

 

Oscillator speed select 20MHz

JP13

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

5MB

(4) 256K x 9

(4) 1 M x 9

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

32MB

(4) 4M x 9

(4) 4M x 9

CPU TYPE CONFIGURATION

Type

JP8

JP9

JP10

JP11

80486SX

Open

Open

pins 1 & 2 closed

pins 1 & 2 closed

80487SX

Closed

Open

Open

pins 2 & 3 closed

80486DX

Closed

Closed

pins 2 & 3 closed

pins 1 & 2 closed

CHIPSET TYPE CONFIGURATION

Type

JP6

JP7

JP14

JP15

82C493

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

82C492

pins 2 & 3 closed

pins 1 & 2 closed

pins 1 & 2 closed

pins 2 & 3 closed