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PS/2 MODEL 70 486/25 Motherboard Settings and Configuration






IBM CORPORATION

PS/2 MODEL 70 486/25

Processor

80486DX

Processor Speed

25MHz

Chip Set

IBM

Max. Onboard DRAM

8MB

Cache

None

BIOS

IBM

Dimensions

355.6mm x 304.8mm

I/O Options

Serial port, parallel port, pointing device connector, proprietary hard/floppy drive controller slot, proprietary 16-bit MCA video adapter slot, VGA port

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Battery/speaker

J1

Keyboard

J5

Serial port

J2

Proprietary hard/floppy drive controller

J6

Parallel port

J3

Proprietary 16-bit MCA video adaptor

J7

Pointing device

J4

VGA port

J8

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) 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

5MB

(1) 256K x 36

(1) 512K x 36

(1) 512K x 36

NONE

6MB

(1) 256K x 36

(1) 256K x 36

(1) 512K x 36

(1) 512K x 36

6MB

(1) 512K x 36

(1) 512K x 36

(1) 512K x 36

NONE

7MB

(1) 256K x 36

(1) 512K x 36

(1) 512K x 36

(1) 512K x 36

8MB

(1) 512K x 36

(1) 512K x 36

(1) 512K x 36

(1) 512K x 36

Notes:SIMMs are a proprietary IBM design, standard 36-bit SIMMs can not be used.

Onboard memory does not need to be totally populated in order to use memory expansion cards.








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