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12MHZ TURBO XT MAINBOARD

UNIDENTIFIED

12MHZ TURBO XT MAINBOARD

Processor

8088

Processor Speed

12MHz

Chip Set

Unidentified

Max. Onboard DRAM

640KB

Cache

None

BIOS

Unidentified

Dimensions

220mm x 220mm

I/O Options

None

NPU Options

8087

CONNECTIONS

Purpose

Location

Purpose

Location

Power LED

CN3

Power LED & keylock

CN6

Reset switch

CN4

Turbo LED

CN7

Speaker

CN5

Turbo switch

CN8

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

Memory wait state select 0 wait states

J6

Open

 

Memory wait state select 1 wait state

J6

Closed

Parity check disabled

SW/1

On

 

Parity check enabled

SW/1

Off

Factory configured - do not alter

SW/2

On

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

256KB

(2) 414256 & (1) 41256

NONE

NONE

512KB

(2) 414256 & (1) 41256

(2) 414256 & (1) 41256

NONE

640KB

(2) 414256 & (1) 41256

(2) 414256 & (1) 41256

(2) 414256 & (1) 41256

DRAM SWITCH CONFIGURATION

Size

SW/3

SW/4

256KB

Off

On

512KB

On

Off

640KB

Off

Off

MONITOR DISPLAY CONFIGURATION

Display

SW/5

SW/6

Color (40 x 25)

Off

On

Color (80 x 25)

On

Off

Monochrome

Off

Off

FLOPPY DRIVE CONFIGURATION

Drives installed

SW/7

SW/8

1

On

On

2

Off

On

3

On

Off

4

Off

Off