TEXAS MICRO SYSTEMS, INC.

E486C

Processor

80486DX/80486DX2/80486DX4

Processor Speed

25/33/50(internal)/50/66(internal)/100(internal)MHz

Chip Set

Unidentified

Video Chip Set

None

Maximum Onboard Memory

64MB

Maximum Video Memory

None

Cache

256KB

BIOS

Unidentified

Dimensions

355mm x 304mm

I/O Options

Auxiliary bus slots (6), CPU slot, floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Serial port 2

J1

PS/2 mouse port

J5

IDE interface

J2

Parallel port

J9

Serial port 1

J3

IDE interface LED

JP4

Floppy drive interface

J4

   

USER CONFIGURABLE SETTINGS

Function

Label

Position

»

Factory configured - do not alter

JP6

Pins 1 & 2, 3 & 4 closed

»

Counter timing select free running

JP9

Pins 2 & 3 closed

 

Counter timing select CPU heartbeat (ADS)

JP9

Pins 1 & 2 closed

»

Factory configured - do not alter

JP11

Pins 2 & 3 closed

»

Factory configured - do not alter

JP12

Pins 2 & 3 closed

»

Factory configured - do not alter

JP14

Open

»

PS/2 mouse IRQ 12 unbuffered

JP15

Pins 1 & 2 closed

 

PS/2 mouse IRQ 12 buffered

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 270

SW1/4

Off

 

I/O address select 370

SW1/4

On

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(1) 256K x 36

None

None

None

2MB

(1) 256K x 36

(1) 256K x 36

None

None

3MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

None

4MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

4MB

(1) 1M x 36

None

None

None

8MB

(1) 1M x 36

(1) 1M x 36

None

None

10MB

(1) 1M x 36

(1) 1M x 36

(1) 256K x 36

(1) 256K x 36

12MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

None

16MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

16MB

(1) 4M x 36

None

None

None

32MB

(1) 4M x 36

(1) 4M x 36

None

None

32MB

(1) 2M x 36

(1) 2M x 36

(1) 2M x 36

(1) 2M x 36

48MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

None

64MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

CACHE CONFIGURATION

Note: 256KB cache is factory installed and is not configurable.

CPU SPEED SELECTION

Speed

JP5

25MHz

Pins 5 & 6, 7 & 8 closed

33MHz

Pins 5 & 6 closed

50iMHz

Pins 5 & 6, 7 & 8 closed

50MHz

Pins 1 & 2, 5 & 6 closed

66iMHz

Pins 5 & 6 closed

100iMHz

Pins 5 & 6 closed

CPU TYPE SELECTION

Type

JP17

80486DX

Pins 2 & 3 closed

80486DX2

Pins 2 & 3 closed

80486DX4

Pins 1 & 2 closed

CPU MULTIPLIER SELECTION

Multiplier

JP18

2x

Pins 1 & 2 closed

3x

Pins 2 & 3 closed

SERIAL PORT 2 SELECTION

Setting

JP1

JP2

JP3

»

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

BUS CLOCK BUFFER SELECTION

Setting

JP7

JP16

Unbuffered

Pins 1 & 2 closed

Pins 1 & 2 closed

Buffered

Pins 2 & 3 closed

Pins 2 & 3 closed

CONNECTIONS

Purpose

Location

Purpose

Location

DC power

J20

Front keyboard connector

JP15

DC power

J21

CPU slot

SL1

Rear keyboard connector

JP14

Auxiliary bus slots

SL2 – SL6

USER CONFIGURABLE SETTINGS

Function

Label

Position

»

Slot 7 card type select EISA

JP1

Pins 2 & 3 closed

 

Slot 7 card type select ISA

JP1

Pins 1 & 2 closed

»

Slot 5 card type select EISA

JP2

Pins 2 & 3 closed

 

Slot 5 card type select ISA

JP2

Pins 1 & 2 closed

»

Slot 3 card type select EISA

JP3

Pins 2 & 3 closed

 

Slot 3 card type select ISA

JP3

Pins 1 & 2 closed

»

Slot 1 card type select EISA

JP4

Pins 2 & 3 closed

 

Slot 1 card type select ISA

JP4

Pins 1 & 2 closed

»

Slot 9 card type select EISA

JP5

Pins 2 & 3 closed

 

Slot 9 card type select ISA

JP5

Pins 1 & 2 closed

»

Slot 11 card type select EISA

JP6

Pins 2 & 3 closed

 

Slot 11 card type select ISA

JP6

Pins 1 & 2 closed

»

Slot 13 card type select EISA

JP7

Pins 2 & 3 closed

 

Slot 13 card type select ISA

JP7

Pins 1 & 2 closed

»

Slot 6 card type select EISA

JP8

Pins 2 & 3 closed

 

Slot 6 card type select ISA

JP8

Pins 1 & 2 closed

»

Slot 4 card type select EISA

JP9

Pins 2 & 3 closed

 

Slot 4 card type select ISA

JP9

Pins 1 & 2 closed

»

Slot 2 card type select EISA

JP10

Pins 2 & 3 closed

 

Slot 2 card type select ISA

JP10

Pins 1 & 2 closed

»

Slot 8 card type select EISA

JP11

Pins 2 & 3 closed

 

Slot 8 card type select ISA

JP11

Pins 1 & 2 closed

»

Slot 10 card type select EISA

JP12

Pins 2 & 3 closed

 

Slot 10 card type select ISA

JP12

Pins 1 & 2 closed

»

Slot 12 card type select EISA

JP13

Pins 2 & 3 closed

 

Slot 12 card type select ISA

JP13

Pins 1 & 2 closed

Note: Slot 1 is located at the top of the diagram.