HwMuseum | Index

CSS LABORATORIES, INC.

MINIMAX/LITTLE MAX 486

Processor

80486SX/80486DX/80486DX2/Pentium Overdrive

Processor Speed

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

Chip Set

SIS

Max. Onboard DRAM

16MB

Cache

64/128/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

Floppy drive interface, IDE interface, parallel port, serial ports (2)

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Power LED & keylock

J4

Floppy drive interface

PJ1

Reset switch/Turbo LED

J5

Parallel port

PJ2

Turbo switch (not available on MiniMax)

J6

Serial port 1

PJ3

Speaker

J9

Serial port 2

PJ4

Equipment panel connector

J39

IDE interface

PJ5

IDE interface LED

J40

Riser Card

SL1

IDE interface LED (on board IDE)

LED

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

CPU speed select iOSC/1 (50/66MHz)

J1

pins 1 & 2 closed

 

CPU speed select iOSC/2 (25/33MHz)

J1

pins 2 & 3 closed

»

Ocsillator type select OSC1 (25/50MHz)

J2

pins 1 & 2 closed

 

Ocsillator type select OSC3 (33/66MHz)

J2

pins 2 & 3 closed

»

Monitor type select color

J3

pins 1 & 2 closed

 

Monitor type select monochrome

J3

pins 2 & 3 closed

»

Factory configured - do not alter

J11

Open

»

Floppy drive interface enabled

S4

pins 2 & 3 closed

 

Floppy drive interface disabled

S4

pins 1 & 2 closed

»

IDE interface enabled

S5

pins 2 & 3 closed

 

IDE interface disabled

S5

pins 1 & 2 closed

SERIAL PORT CONFIGURATION (PJ3)

Port 1

IRQ

S0

S1

PJ6

Disabled

N/A

pins 1 & 2 closed

pins 1 & 2 closed

N/A

COM1

IRQ4

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

COM2

IRQ3

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 3 closed

SERIAL PORT CONFIGURATION (PJ4)

Port 2

IRQ

S2

S3

PJ6

Disabled

N/A

pins 1 & 2 closed

pins 1 & 2 closed

N/A

COM1

IRQ4

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 4 closed

COM2

IRQ3

pins 2 & 3 closed

pins 2 & 3 closed

pins 3 & 4 closed

PARALLEL PORT CONFIGURATION

LPT

IRQ

P0

P1

PRT

Disabled

N/A

pins 1 & 2 closed

pins 1 & 2 closed

N/A

LPT 1

IRQ7

pins 2 & 3 closed

pins 1 & 2 closed

pins 2 & 3 closed

LPT 2

IRQ5

pins 2 & 3 closed

pins 2 & 3 closed

pins 1 & 2 closed

LPT 3

IRQ7

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(1) 256K x 36

NONE

2MB

(1) 256K x 36

(1) 256K x 36

2MB

(1) 512K x 36

NONE

4MB

(1) 1M x 36

NONE

5MB

(1) 256K x 36

(1) 1M x 36

6MB

(1) 512K x 36

(1) 1M x 36

8MB

(1) 1M x 36

(1) 1M x 36

8MB

(1) 2M x 36

NONE

10MB

(1) 512K x 36

(1) 2M x 36

16MB

(1) 2M x 36

(1) 2M x 36

DRAM JUMPER CONFIGURATION

Size

J8

J10

1MB

Open

Open

2MB

pins 1 & 2 closed

pins 2 & 3 closed

2MB

pins 2 & 3 closed

Open

4MB

Open

Open

5MB

pins 1 & 2 closed

pins 2 & 3 closed

6MB

pins 2 & 3 closed

pins 1 & 2 closed

8MB

pins 1 & 2 closed

pins 2 & 3 closed

8MB

pins 2 & 3 closed

Open

10MB

pins 2 & 3 closed

pins 1 & 2 closed

16MB

pins 2 & 3 closed

pins 1 & 2 closed

Note: This board accepts 4M x 36 SIMMS, but jumper settings are not identified by the manufacturer.

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

128KB

(4) 32K x 8

NONE

(1) 32K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

W6

W7

W8

W9

64KB

Open

Open

pins 2 & 3 closed

pins 2 & 3 closed

128KB

Open

Closed

pins 1 & 2 closed

pins 1 & 2 closed

256KB

Closed

Closed

pins 2 & 3 closed

pins 2 & 3 closed

CPU TYPE CONFIGURATION

Type

W2

W4

W5

80486SX

pins 1 & 2 closed

pins 1 & 2 closed

Closed

80486DX

pins 2 & 3 closed

pins 2 & 3 closed

Open

CPU TYPE CONFIGURATION (OVERDRIVE)

Type

W1

W3

Overdrive installed

pins 1 & 2 closed

Closed

Overdrive not installed

pins 2 & 3 closed

Open

EQUIPMENT PANEL CONNECTOR PIN OUT

Description

J39

Ground

pin 1

Power

pin 1

Hard drive LED

pin 3

Not used

pin 4

Power

pin 5

Ground

pin 6

Turbo LED

pin 7

Keyboard inhibit

pin 8

Power

pin 9

Reset button

pin 10