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E486C

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.