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ATLAS PCI PENTIUM ISA

AMERICAN MEGATRENDS, INC.

ATLAS PCI PENTIUM ISA

Processor

Pentium

Processor Speed

90/100MHz

Chip Set

American Megatrends

Max. Onboard DRAM

128MB

Cache

256/512KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit PCI bus slots (4), floppy drive interface, IDE interface (2), green PC feature, parallel port, PS/2 mouse port, serial ports (2), green PC monitor connector

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Green PC power connector

J1

Power LED & keylock

J15

Serial port 1

J4

Speaker

J17

Serial port 2

J5

Reset switch

J18

Parallel port

J7

Turbo switch

J20

Floppy drive interface

J8

Turbo LED

J24

IDE interface (secondary)

J10

Green PC monitor connector

J25

IDE interface (primary)

J11

IDE interface IDE

J28

PS/2 mouse port

J13

32-bit PCI bus slots

SL1 - SL4

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Cache memory type select write back

J29

Open

 

Cache memory type select write through

J29

Closed

Parallel port IRQ select IRQ7

J37

pins 1 & 2 closed

 

Parallel port IRQ select IRQ5

J37

pins 2 & 3 closed

Serial port 2 IRQ select IRQ3

J38

pins 1 & 2 closed

 

Serial port 2 IRQ select IRQ4

J38

pins 2 & 3 closed

Serial port 1 IRQ select IRQ4

J39

pins 1 & 2 closed

 

Serial port 1 IRQ select IRQ3

J39

pins 2 & 3 closed

Onboard mouse IRQ12 enabled

J40

pins 1 & 2 closed

 

Bus mouse IRQ12 enabled

J40

pins 2 & 3 closed

Factory configured - do not alter

J47

Open

CMOS memory normal operation

J48

Open

 

CMOS memory clear

J48

Closed

Factory configured - do not alter

J51

Open

DRAM CONFIGURATION

Size

Bank 0

Bank 1

2MB

(2) 256K x 36

NONE

4MB

(2) 256K x 36

(2) 256K x 36

4MB

(2) 512K x 36

NONE

8MB

(2) 512K x 36

(2) 512K x 36

8MB

(2) 1M x 36

NONE

16MB

(2) 1M x 36

(2) 1M x 36

16MB

(2) 2M x 36

NONE

20MB

(2) 512K x 36

(2) 2M x 36

32MB

(2) 2M x 36

(2) 2M x 36

32MB

(2) 4M x 36

NONE

36MB

(2) 512K x 36

(2) 4M x 36

40MB

(2) 1M x 36

(2) 4M x 36

48MB

(2) 2M x 36

(2) 4M x 36

64MB

(2) 4M x 36

(2) 4M x 36

64MB

(2) 8M x 36

NONE

80MB

(2) 2M x 36

(2) 8M x 36

128MB

(2) 8M x 36

(2) 8M x 36

128MB

(2) 16M x 36

NONE

CACHE CONFIGURATION

Size

Bank 0

256KB

(8) 32K x 8

512KB

(8) 64K x 8

CACHE JUMPER CONFIGURATION

Size

J21

J22

J23

256KB

pins 1 & 2 closed

pins 1 & 2 closed

pins 1 & 2 closed

512KB

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

CPU OUTPUT SIGNAL BUFFER CONFIGURATION

Output signal buffer

J30

J32

Normal system

Open

Open

Loaded system

Closed

Open

Extra loaded system

Closed

Closed

CPU SPEED CONFIGURATION

Speed

JP33

60/66/90i/100iMHz

Closed

50/100iMHz

Open

3.3 VOLT POWER SOURCE CONFIGURATION (INTERNAL)

J3

J34

P3 & P4

Open

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

Open

3.3 VOLT POWER SOURCE CONFIGURATION (EXTERNAL)

J3

J34

P3 & P4

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

Open

Closed

PARALLEL PORT DMA CONFIGURATION

DMA channel

J43

J44

None

Open

Open

DRQ0

pins 1 & 2 closed

pins 1 & 2 closed

DRQ1

pins 3 & 4 closed

pins 3 & 4 closed

DRQ3

pins 5 & 6 closed

pins 5 & 6 closed