UNIDENTIFIED

TURBO 640

Processor

8088

Processor Speed

8MHz

Chip Set

None

Max. onboard DRAM

640KB

Cache

None

BIOS

Unknown

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

8087

CONNECTIONS

Purpose

Location

Purpose

Location

Turbo switch

JP5

Power/Turbo LED

JP9

Keylock

JP8

Speaker

P4

Note:The exact locations of JP5 and JP8 are unknown.

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

Factory configured - do not alter

JP1

Unknown

Factory configured - do not alter

SW1/switch 1

Off

NPU enabled

SW1/switch 2

Off

 

NPU disabled

SW1/switch 2

On

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

JP3

JP4

256KB

(8) 4164

(8) 4164

(8) 4164

(8) 4164

A & B closed

B closed

256KB

(8) 41256

NONE

NONE

NONE

C & D closed

A closed

512KB

(8) 41256

(8) 41256

NONE

NONE

C & D closed

A closed

640KB

(8) 41256

(8) 41256

(8) 4164KB

(8) 4164KB

C & D closed

A closed

TURBO CONFIGURATION

Mode

JP6

JP7

Software switch

Open

Closed

Hardware switch

Closed

Open

DISPLAY CONFIGURATION

Display Adapter

SW1/5

SW1/6

SW1/7

SW1/8

None

On

On

N/A

N/A

Color/Graphics (40x20)

Off

On

On

On

Color/Graphics (80x25)

On

Off

On

On

Monochrome or Both

Off

Off

On

On

FLOPPY DRIVE CONFIGURATION

Drives Installed

SW1/7

SW1/8

1

On

On

2

Off

On

3

On

Off

4

Off

Off