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L386SX CPU (REV. B)

TEXAS MICRO, INC.

L386SX CPU (REV. B)

Device Type

Single board computer

Processor

AM386SX/80386SX

Processor Speed

Unidentified

Chip Set

Unidentified

Video Chip Set

Unidentified

Maximum Onboard Memory

16MB

Maximum Video Memory

Unidentified

Cache

64KB

BIOS

Unidentified

Dimensions

338mm x 122mm

I/O Options

Floppy drive interface, IDE interface, parallel port, serial ports (2)

NPU options

80387SX

CONNECTIONS

Purpose

Location

Purpose

Location

Serial port 1

CN1

External battery

JP1

Parallel port

CN2

IDE interface LED

JP7

Keyboard connector

CN3

Auxiliary keyboard connector

JP12

IDE interface

J1

Video board connector

JP14

Floppy drive interface

J2

Video board connector

JP16

Serial port 2

J3

 

 

USER CONFIGURABLE SETTINGS

Function

Label

Position

 

On board battery enabled

JP1

Pins 1 & 2 closed

 

On board battery disabled

JP1

Pins 2 & 3 closed

 

Watchdog timer enabled

JP13

Pins 1 & 2 closed

 

Watchdog timer disabled

JP13

Pins 2 & 3 closed

Factory configured - do not alter

JP17

Pins 2 & 3 closed

Factory configured - do not alter

JP18

Pins 2 & 3 closed

Factory configured - do not alter

JP19

Open

Factory configured - do not alter

JP20

Pins 1 & 2 closed

Factory configured - do not alter

JP21

Pins 1 & 2 closed

Monitor type select color

SW1/1

On

 

Monitor type select monochrome

SW1/1

Off

 

Flash memory enabled

SW1/2

Off

 

Flash memory 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

Note: The location of JP19, JP20 & JP21 are unidentified.

SIMM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(2) 256K x 9

(2) 256K x 9

2MB

(2) 1M x 9

None

4MB

(2) 1M x 9

(2) 1M x 9

8MB

(2) 4M x 9

None

16MB

(2) 4M x 9

(2) 4M x 9

CACHE CONFIGURATION

Note: The location of the cache is unidentified.

CACHE JUMPER CONFIGURATION

Size

JP2

JP3

JP4

JP5

JP6

64KB

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

VIDEO MEMORY CONFIGURATION

Note: The location of the video memory is unidentified.

SERIAL PORT SELECTION

Setting

JP8

JP9

JP10

RS-232

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

 

RS-422

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

 

RS-485

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

WATCHDOG SELECTION

Seconds

JP15

1.2 seconds

Pins 1 & 2 closed

150ms

Pins 2 & 3 closed

600ms

Open