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PS/1 MT2133A, MT2155A, MT2168A

IBM CORPORATION

PS/1 MT2133A, MT2155A, MT2168A

Processor

80486SX/80487SX/80486DX/80486DX2/P23T/P24T

Processor Speed

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

Chip Set

Unidentified

Video Chip Set

Unidentified

Maximum Onboard Memory

32MB

Maximum Video Memory

1MB

Cache

64/256KB

BIOS

Unidentified

Dimensions

330mm x 218mm

I/O Options

Floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), VGA feature connector, VGA port, riser slot

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

PS/2 mouse port

J2

VGA feature connector

J14

Serial port 1

J3

Power LED

J26 pins 1 & 2

Serial port 2

J4

IDE interface LED

J26 pins 3 & 4

Parallel port

J5

Speaker

J27

VGA port

J6

Power supply

J29

Floppy drive interface

J7

Power supply

J30

IDE interface

J9

Riser slot

SL1

USER CONFIGURABLE SETTINGS

Function

Label

Position

 

Password normal operation

J31

Pins 2 & 3 closed

 

Password clear

J31

Pins 1 & 2 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

2MB

(1) 512K x 36

None

None

None

4MB

(1) 1M x 36

None

None

None

4MB

(1) 512K x 36

(1) 512K x 36

None

None

6MB

(1) 512K x 36

(1) 512K x 36

(1) 512K x 36

None

8MB

(1) 2M x 36

None

None

None

8MB

(1) 1M x 36

(1) 1M x 36

None

None

8MB

(1) 512K x 36

(1) 512K x 36

(1) 512K x 36

(1) 512K x 36

16MB

(1) 4M x 36

None

None

None

16MB

(1) 2M x 36

(1) 2M x 36

None

None

24MB

(1) 2M x 36

(1) 2M x 36

(1) 2M x 36

None

32MB

(1) 4M x 36

(1) 4M x 36

None

None

32MB

(1) 2M x 36

(1) 2M x 36

(1) 2M x 36

(1) 2M x 36

Note: Banks are interchangeable.

CACHE CONFIGURATION

Size

Bank 0

TAG

64KB

(8) 8K x 8

(1) 32K x 8

256KB

(8) 32K x 8

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

J16

J17

J18

J32

64KB

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

Pins 2 & 3 closed

256KB

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

Pins 1 & 2 closed

VIDEO MEMORY CONFIGURATION

Size

CN1

512KB

512KB module installed

1MB

1MB module installed

CPU TYPE SELECTION

Type

J23

80486SX

Pins 2 & 3 closed

80487SX

Pins 2 & 3 closed

80486DX

Pins 1 & 2 closed

80486DX2

Pins 1 & 2 closed

P23T

Pins 2 & 3 closed

P24T

Pins 1 & 2 closed