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LS486/L486

TEXAS MICROSYSTEMS, INC.

LS486/L486

Processor

80486SX/80487SX/80486DX/80486DX2

Processor Speed

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

Chip Set

Unidentified

Video Chip Set

None

Maximum Onboard Memory

32MB

Maximum Video Memory

None

Cache

None

BIOS

Unidentified

Dimensions

Unidentified

I/O Options

Floppy drive interface, IDE interface, SCSI interface, parallel port, serial ports (2), video board connector

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

SCSI interface

J1

Auxiliary keyboard connector

J7

IDE interface

J2

External battery

JP4

Floppy drive interface

J3

Hard drive LED

JP5

Serial port 2

J4

Video board connector

JP9

Serial port 1

J5

Texas Micro keyboard connector

JP11

Parallel port

J6

Video board connector

JP13

USER CONFIGURABLE SETTINGS

Function

Label

Position

Battery type select internal

JP4

Pins 1 & 2 closed

 

Battery type select external

JP4

Closed

Watchdog timer disabled

JP12

Pins 2 & 3 closed

 

Watchdog timer enabled

JP12

Pins 1 & 2 closed

 

On board SCSI enabled

JP15

Pins 1 & 2 closed

 

On board SCSI disabled

JP15

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

I/O address select 270H

SW1/4

Off

 

I/O address select 370H

SW1/4

On

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(1) 256K x 36

None

2MB

(1) 256K x 36

(1) 256K x 36

4MB

(1) 1M x 36

None

5MB

(1) 1M x 36

(1) 256K x 36

8MB

(1) 1M x 36

(1) 1M x 36

16MB

(1) 4M x 36

None

17MB

(1) 4M x 36

(1) 256K x 36

20MB

(1) 4M x 36

(1) 1M x 36

32MB

(1) 4M x 36

(1) 4M x 36

CPU TYPE SELECTION

Type

JP1

JP2

JP3

80486SX

Pins 2 & 3 closed

Pins 1 & 2 closed

Pins 2 & 3 closed

80487SX

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

80486DX

Pins 1 & 2 closed

Pins 2 & 3 closed

Pins 1 & 2 closed

80486DX2

Pins 1 & 2 closed

Pins 2 & 3 closed

Pins 1 & 2 closed

CPU TYPE SELECTION (80486SX ONLY)

Multiplier

JP10

PQFP

Pins 2 & 3 closed

PGA

Pins 1 & 2 closed

SERIAL PORT 2 SELECTION

Setting

JP6

JP7

JP8

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

WATCHDOG TIMER SELECTION

Timer

JP14

1.2 seconds

Pins 1 & 2 closed

 

150ms

Pins 2 & 3 closed

 

600ms

Open