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M4-4X/M4-6X/PCS4XX (BA204X)

OLIVETTI

M4-4X/M4-6X/PCS4XX (BA204X)

Processor

80486SX/80487SX/80486DX/80486DX2

Processor Speed

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

Chip Set

Unidentified

Maximum Onboard Memory

36MB

Cache

None

BIOS

Unidentified

Dimensions

254mm x 218mm

I/O Options

Floppy drive interfaces (2), IDE interface, parallel port, PS/2 mouse port, serial ports (2), VGA port, riser slot, CD-ROM connector

NPU Options

None

CONNECTIONS

Function

Label

Function

Label

PS/2 mouse port

CN1

CD -ROM connector

CN6

Parallel port

CN2

IDE interface

CN7

Serial port 2

CN3

Floppy drive interface

CN8

Serial port 1

CN4

Floppy drive interface

CN9

VGA port

CN5

Riser slot

SL1

USER CONFIGURABLE SETTINGS

Setting

Label

Position

Factory configured - do not alter

F1

N/A

 

Hard drives installed 1

J2

Closed

 

Hard drives installed 2

J2

Open

Setup access disabled

J12

Pins 2 & 3 closed

 

Setup access enabled

J12

Pins 1 & 2 closed

Mouse IRQ12 enabled

J13

Pins 2 & 3 closed

 

Mouse IRQ12 disabled

J13

Pins 1 & 2 closed

Serial port 1 bootstrap enabled

J21

Pins 2 & 3 closed

 

Serial port 1 bootstrap disabled

J21

Pins 1 & 2 closed

Serial port 2 bootstrap enabled

J25

Pins 2 & 3 closed

 

Serial port 2 bootstrap disabled

J25

Pins 1 & 2 closed

Floppy drives not write protected

J33

Pins 2 & 3 closed

 

Floppy drives write protected

J33

Pins 1 & 2 closed

Factory configured - do not alter

J45

N/A

DRAM

Size

Bank 0

Bank 1

4MB

4MB

None

8MB

4MB

(1) 1M x 36

12MB

4MB

(1) 2M x 36

20MB

4MB

(1) 4M x 36

36MB

4MB

(1) 8M x 36

Note: Bank 0 is factory configured and is not configurable.

CPU TYPE

Setting

J28

J29

80486SX (PQFP)

Pins 1 & 2 closed

Pins 1 & 2 closed

80486SX (PQFP)/80487SX

Pins 1 & 2 closed

Pins 1 & 2 closed

80486SX (PQFP)/80486DX2

Pins 1 & 2 closed

Pins 1 & 2 closed

80486SX (PGA)

Pins 2 & 3 closed

Pins 1 & 2 closed

80487SX

Pins 1 & 2 closed

Pins 1 & 2 closed

80486DX

Pins 1 & 2 closed

Pins 2 & 3 closed

80486DX2

Pins 1 & 2 closed

Pins 2 & 3 closed

CPU SPEED

Setting

J44

25MHz

Closed

33MHz

Open

50iMHz

Closed

66iMHz

Open

VIDEO MEMORY

Size

Bank 0

Bank 1

512KB

512KB

None

1MB

512KB

512KB

Note: Bank 0 is factory installed and is not configurable. The chip sizes are unidentified.

MISCELLANEOUS TECHNICAL NOTE

The location of pin 1 is unidentified.