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DS486

TEXAS MICROSYSTEMS, INC.

DS486

Processor

80486SX/80486DX/80486DX2/80486DX4

Processor Speed

33/66(internal)/100(internal)MHz

Chip Set

Intel

Video Chip Set

None

Maximum Onboard Memory

128MB

Maximum Video Memory

None

Cache

256KB

BIOS

Phoenix

Dimensions

337mm x 122mm

I/O Options

Floppy drive interface, IDE interface, SCSI interface, parallel port, PS/2 mouse interface, serial ports (2), PCI video module connector

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

SCSI interface

CN1

Serial port 1

CN6

IDE interface

CN2

Parallel port

CN7

PS/2 mouse & keyboard interface

CN3

PCI video module connector

CN8

Floppy drive interface

CN4

AT keyboard connector

CN9

Serial port 2

CN5

Hard drive LED

JP20

USER CONFIGURABLE SETTINGS

Function

Label

Position

PCI bus speed select 33MHz

JP2

Pins 2 & 3 closed

 

PCI bus speed select 25MHz

JP2

Pins 1 & 2 closed

Factory configured - do not alter

JP4

Pins 1 & 2 closed

Factory configured - do not alter

JP13

Pins 2 & 3 closed

Factory configured - do not alter

JP14

Pins 2 & 3 closed

Factory configured - do not alter

JP17

Unidentified

Factory configured - do not alter

JP19

Unidentified

SCSI speed select 33MHz

JP24

Pins 2 & 3 closed

 

SCSI speed select 40MHz

JP24

Pins 1 & 2 closed

Watchdog timer enabled

JP25

Pins 1 & 2 closed

 

Watchdog timer disabled

JP25

Pins 2 & 3 closed

PS/2 IRQ12 enabled

JP26

Pins 1 & 2 closed

 

Next Step OS used

JP26

Pins 2 & 3 closed

Monitor type select color

SW1/1

On

 

Monitor type select monochrome

SW1/1

Off

Flash BIOS enabled

SW1/2

Off

 

Flash BIOS disabled

SW1/2

On

CMOS memory normal operation

SW1/3

Off

 

CMOS memory clear

SW1/3

On

Factory configured - do not alter

SW1/4

Unidentified

DRAM CONFIGURATION

Size

Bank 0

Bank 1

8MB

(2) 1M x 36

None

16MB

(2) 1M x 36

(2) 1M x 36

24MB

(2) 2M x 36

(2) 1M x 36

32MB

(2) 4M x 36

None

40MB

(2) 4M x 36

(2) 1M x 36

48MB

(2) 4M x 36

(2) 2M x 36

64MB

(2) 8M x 36

None

64MB

(2) 4M x 36

(2) 4M x 36

96MB

(2) 8M x 36

(2) 4M x 36

128MB

(2) 8M x 36

(2) 8M x 36

Note: Board also accepts x 32 SIMMs.

CACHE CONFIGURATION

Note: Bank 0 is factory installed and is not configurable. The location is unidentified.

CACHE JUMPER CONFIGURATION

Size

JP8

JP9

JP16

256KB

Pins 1 & 2 closed

Pins 2 & 3 closed

Pins 5 & 6 closed

CPU TYPE SELECTION

Type

JP3

JP5

80486SX

Pins 1 & 2 closed

Pins 2 & 3 closed

80486DX

Pins 2 & 3 closed

Pins 2 & 3 closed

80486DX2

Pins 2 & 3 closed

Pins 2 & 3 closed

80486DX4

Pins 2 & 3 closed

Pins 1 & 2 closed

CPU MULTIPLIER SELECTION (80486DX4 ONLY)

Multiplier

JP1

 

2x

Pins 1 & 2 closed

 

2.5x

Pins 2 & 3 closed

3x

Open

SERIAL PORT 2 SELECTION

Setting

JP18

JP21

JP22

RS232

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

 

RS422

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

 

RS485

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed