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SPECTRUM II 486 PCI/ISA/VESA

FORTRESS SYSTEMS INTERNATIONAL

SPECTRUM II 486 PCI/ISA/VESA

Processor

CX486SX/AM486SX/80486SX/CX486DX/AM486DX/80486DX/ CX486DX2/AM486DX2/80486DX2/CX486DX4/AM486DX4/80486DX4

Processor Speed

25/33/40/50(internal)/66(internal)/75(internal)/100(internal)MHz

Chip Set

Unidentified

Video Chip Set

None

Maximum Onboard Memory

64MB

Maximum Video Memory

None

Cache

128/256/512KB

BIOS

AMI/Award/MR BIOS

Dimensions

254mm x 218mm

I/O Options

32-bit VESA local bus slots (2), 32-bit PCI slots (4)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Turbo switch

J1

Power LED & keylock

J5

Turbo LED

J2

32-bit PCI slots

PC1 – PC4

Speaker

J3

32-bit VESA local bus slots

SL1 & SL2

Reset switch

J4

   

USER CONFIGURABLE SETTINGS

Function

Label

Position

»

CMOS memory normal operation

JP2

Pins 1 & 2 closed

 

CMOS memory clear

JP2

Pins 2 & 3 closed

»

Factory configured - do not alter

JP10A

Open

»

Factory configured - do not alter

JP10B

Pins 1 & 2 closed

»

Factory configured - do not alter

JP10C

Pins 2 & 3 closed

»

Factory configured - do not alter

JP10D

Open

»

Factory configured - do not alter

JP10E

Open

»

Factory configured - do not alter

JP38A

Open

»

Factory configured - do not alter

JP38B

Pins 1 & 2 closed

»

Factory configured - do not alter

JP38C

Pins 2 & 3 closed

 

IDE type select PCI IDE

JP38D

Closed

 

IDE type select VESA IDE

JP38D

Open

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

2MB

(1) 512K x 36

None

None

None

3MB

(1) 256K x 36

(1) 512K 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) 512K x 36

(1) 512K x 36

None

None

4MB

(1) 1M x 36

None

None

None

5MB

(1) 256K x 36

(1) 1M x 36

None

None

5MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

(1) 512K x 36

6MB

(1) 512K x 36

(1) 1M x 36

None

None

8MB

(1) 1M x 36

(1) 1M x 36

None

None

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) 2M x 36

(1) 2M x 36

None

None

DRAM CONFIGURATION (CON’T)

Size

Bank 0

Bank 1

Bank 2

Bank 3

16MB

(1) 4M x 36

None

None

None

32MB

(1) 4M x 36

(1) 4M x 36

None

None

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

Note: Board accepts x 32 SIMMs.

DRAM JUMPER CONFIGURATION

Setting

JP23

1 BK installed

Pins 1 & 2 closed

2 BK installed

Pins 2 & 3 closed

CACHE CONFIGURATION

Size

Bank 0

TAG

128KB

(4) 32K x 8

(1) 8K x 8

256KB

(2) 64K x 32

(1) 32K x 8

512KB

(4) 128K x 8

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP20

128KB

Pins 1 & 2 closed

256KB

Pins 1 & 2 closed

512KB

Pins 2 & 3 closed

CPU SPEED SELECTION

Speed

JP7

JP27

JP28

25MHz

Closed

Pins 1 & 2 closed

Pins 2 & 3 closed

33MHz

Open

Pins 2 & 3 closed

Pins 1 & 2 closed

50iMHz

Closed

Pins 1 & 2 closed

Pins 2 & 3 closed

66iMHz

Open

Pins 2 & 3 closed

Pins 1 & 2 closed

75iMHz

Closed

Pins 1 & 2 closed

Pins 2 & 3 closed

100iMHz

Open

Pins 2 & 3 closed

Pins 1 & 2 closed

CPU TYPE SELECTION

Type

JP11

Cyrix

Pins 2 & 3 closed

AMD

Pins 1 & 2 closed

Intel

Pins 1 & 2 closed

CPU TYPE SELECTION

Type

JP99

All CPU types

Closed

DX4 only

Open

FLASH BIOS VOLTAGE SELECTION

Voltage

JP12

JP80

5v

Pins 1 & 2 closed

Pins 1 & 3, 2 & 4 closed

12v

Pins 2 & 3 closed

Pins 3 & 5, 4 & 6 closed