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486 PERSONAL WORKSTATION

INTERCOMP, INC.

486 PERSONAL WORKSTATION

Processor

80486SX/80487SX/80486DX/ODP486SX/80486DX2/80586SX

Processor Speed

20/25/33/50(Internal)/50/66(Internal)MHz

Chip Set

Intercomp/OPTI

Max. onboard DRAM

64MB

SRAM Cache

64/128/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit VESA local bus slots (2), 10 base T ethernet

floppy drive interface, IDE interface, parallel port

serial port (2), VGA port, VGA feature connector

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

P5

VGA feature connector

P21

Serial port (COM2)

P7

Keylock

P31A

Serial port (COM1)

P8

Speaker

P31B

IDE interface

P9

IDE interface LED

P31D

Parallel port

P10

Turbo LED

P31E

Floppy drive interface

P11

Turbo Switch

P31F

10 base T ethernet

P18

Reset

P31G

VGA Port

P20

32-bit VESA local bus slots

S1 & S2

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

CMOS memory normal operation

P3

Open

 

CMOS memory clear

P3

Closed

VESA bus enabled

P13

Pins 1 & 2, 3 & 5, 4 & 6 closed

 

VESA bus disabled

P13

Pins 1 & 2, 5 & 7, 6 & 8 closed

IDE select single mode

P19

Pins 1 & 2 closed

 

IDE select master/slave mode

P19

Pins 1 & 2 open

LPT select output mode

P19

Pins 3 & 4 closed

 

LPT select input/output mode

P19

Pins 3 & 4 closed

Factory configured do not alter

P22

Pins 2 & 3 closed

VESA bus VGA controller enabled

P23

Pins 2 & 3 closed

 

VESA bus VGA controller disabled

P23

Pins 1 & 2 closed

Factory configured do not alter

P24

Pins 2 & 3 closed

Factory configured do not alter

P25

Pins 1 & 2 closed

Factory configured do not alter

P26

Pins 2 & 3 closed

Monitor type select color

P31C

Open

 

Monitor type select monochrome

P31C

Closed

Note: VESA bus should be disabled for 50MHz CPU speed operation.

VESA WAIT STATE (ID2) CONFIGURATION

Wait states

CPU speed

P14 (ID2)

0 wait states

£ 33MHz

Pins 1 & 2 open

1 wait state

> 33MHz

Pins 1 & 2 closed

VESA BUS SPEED (ID3) CONFIGURATION

CPU speed

P14 (ID3)

£ 33MHz

Pins 3 & 4 open

> 33MHz

Pins 3 & 4 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(4) 256K x 9

NONE

NONE

NONE

2MB

(4) 256K x 9

(4) 256K x 9

NONE

NONE

3MB

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

NONE

4MB

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

NONE

NONE

NONE

5MB

(4) 256K x 9

(4) 1M x 9

NONE

NONE

6MB

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

NONE

7MB

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

8MB

(4) 1M x 9

(4) 1M x 9

NONE

NONE

9MB

(4) 256K x 9

(4) 1M x 9

(4) 1M x 9

NONE

10MB

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

(4) 1M x 9

12MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

NONE

13MB

(4) 256K x 9

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

16MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

NONE

NONE

17MB

(4) 256K x 9

(4) 4M x 9

NONE

NONE

18MB

(4) 256K x 9

(4) 256K x 9

(4) 4M x 9

NONE

19MB

(4) 256K x 9

(4) 256K x 9

(4) 256K x 9

(4) 4M x 9

20MB

(4) 1M x 9

(4) 4M x 9

NONE

NONE

21MB

(4) 256K x 9

(4) 1M x 9

(4) 4M x 9

NONE

22MB

(4) 256K x 9

(4) 256K x 9

(4) 1M x 9

(4) 4M x 9

24MB

(4) 1M x 9

(4) 1M x 9

(4) 4M x 9

NONE

25MB

(4) 256K x 9

(4) 1M x 9

(4) 1M x 9

(4) 4M x 9

28MB

(4) 1M x 9

(4) 1M x 9

(4) 1M x 9

(4) 4M x 9

32MB

(4) 4M x 9

(4) 4M x 9

NONE

NONE

33MB

(4) 256K x 9

(4) 4M x 9

(4) 4M x 9

NONE

36MB

(4) 1M x 9

(4) 4M x 9

(4) 4M x 9

NONE

37MB

(4) 256K x 9

(4) 1M x 9

(4) 4M x 9

(4) 4M x 9

40MB

(4) 1M x 9

(4) 1M x 9

(4) 4M x 9

(4) 4M x 9

48MB

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

NONE

49MB

(4) 256K x 9

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

52MB

(4) 1M x 9

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

64MB

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

(4) 4M x 9

CACHE CONFIGURATION

Size

Cache

Location

TAG

64KB

(8) 8K x 8

Banks 0 & 1

(1) 16K x 4

128KB

(4) 32K x 8

Bank 0

(1) 16K x 4

256KB

(8) 32K x 8

Banks 0 & 1

(1) 16K x 4

CACHE JUMPER CONFIGURATION

Size

P15

64KB

Pins 3 & 5, 4 & 6, 7 & 8 closed

128KB

Pins 1 & 3, 2 & 4, 7 & 8, 9 & 10 closed

256KB

Pins 3 & 5, 4 & 6, 7 & 8, 9 & 10, 11 & 12 closed

VIDEO START UP CONFIGURATION

Mode

P27

P28

P29

640 x 480, 60Hz

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

640 x 480, 70Hz

Pins 2 & 3 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

800 x 600, 56Hz

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 2 & 3 closed

800 x 600, 60Hz

Pins 1 & 2 closed

Pins 2 & 3 closed

Pins 1 & 2 closed

800 x 600, 70Hz

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 1 & 2 closed

1024 x 768, 43Hz

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

1024 x 768, 60Hz

Pins 1 & 2 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

1024 x 768, 70Hz

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

I/O BASE ADDRESS AND BASE MEMORY ADDRESS

I/O Address

Base Memory Address

P33

P34

300h

D8000h

Closed

Closed

320h

CC000h

Open

Closed

340h

D0000h

Closed

Open

360h

D4000h

Open

Open

CPU TYPE AND SPEED CONFIGURATION

CPU Type

Speed

P16

P17

P30

80486SX

20MHz

Pins 3 & 4 closed

Pins 3 & 5, 4 & 6 closed

Pins 1 & 2 closed

80486SX

25MHz

Open

Pins 3 & 5, 4 & 6 closed

Pins 1 & 2 closed

80487SX

20MHz

Pins 3 & 4 closed

Pins 3 & 5, 4 & 6 closed

Pins 2 & 3 closed

80487SX

25MHz

Open

Pins 3 & 5, 4 & 6 closed

Pins 2 & 3 closed

80486DX

25MHz

Open

Pins 3 & 5, 4 & 6 closed

Pins 2 & 3 closed

80486DX

33MHz

Pins 1 & 2 closed

Pins 3 & 5, 4 & 6 closed

Pins 2 & 3 closed

80486DX

50MHz

Open

Pins 1 & 3, 2 & 4 closed

Pins 2 & 3 closed

80486DX2

50i MHz

Open

Pins 3 & 5, 4 & 6 closed

Pins 2 & 3 closed

80486DX2

66i MHz

Pins 1 & 2 closed

Pins 3 & 5, 4 & 6 closed

Pins 2 & 3 closed