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640K SYSTEM BOARD Motherboard Settings and Configuration






UNIDENTIFIED

640K SYSTEM BOARD

Processor

8088

Processor Speed

10MHz

Chip Set

Unidentified

Max. Onboard DRAM

640KB

Cache

None

BIOS

Unidentified

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

8087

CONNECTIONS

Purpose

Location

Purpose

Location

Turbo switch

JP1

Speaker

JP2C

Turbo LED

JP2A

Reset switch

JP2D

Power LED & keylock

JP2B

   

USER CONFIGURABLE SETTINGS

Function

Switch

Position

Factory configured - do not alter

SW1/1

Off

NPU disabled

SW1/2

On

 

NPU enabled

SW1/2

Off

Factory configured - do not alter

SW1/3

Off

Factory configured - do not alter

SW1/4

Off

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 2A

Bank 3

Bank 3A

256KB

(9) 41256

NONE

NONE

NONE

NONE

NONE

512KB

(9) 41256

(9) 41256

NONE

NONE

NONE

NONE

576KB

(9) 41256

(9) 41256

(2) 4464

(1) 4164

NONE

NONE

640KB

(9) 41256

(9) 41256

(2) 4464

(1) 4164

(2) 4464

(1) 4164

DISPLAY ADAPTER SWITCH CONFIGURATION

Size

SW1/5

SW1/6

None installed

On

On

Color (40 x 20)

Off

On

Color (80 x 25)

On

Off

Monochrome

Off

Off

FLOPPY DRIVE SWITCH CONFIGURATION

Drives installed

SW1/7

SW1/8

1

On

On

2

Off

On

3

On

Off

4

Off

Off








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