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HT12HS

UNIDENTIFIED

HT12HS

Processor

80286

Processor Speed

12/16/20MHz

Chip Set

VLSI

Max. Onboard DRAM

4MB

Cache

None

BIOS

AMI/Eurosoft/Quadtel

Dimensions

220mm x 220mm

I/O Options

None

NPU Options

80287

CONNECTIONS

Purpose

Location

Purpose

Location

Auxiliary keyboard connector

JP1

Turbo switch

JP10

External battery

JP2

Reset switch

JP11

Speaker

JP8

Power LED & keylock

JP12

Turbo LED

JP9

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

 

Monitor type select color

JP3

Closed

 

Monitor type select monochrome

JP3

Open

 

CMOS memory normal operation

JP4

Closed

 

CMOS memory clear

JP4

Open

 

BIOS type select 27256

JP5

pins 2 & 3 closed

 

BIOS type select 27128

JP5

pins 1 & 2 closed

 

NPU speed select 4.77MHz

JP6

pins 1 & 2 closed

 

NPU speed select 10.6MHz

JP6

pins 2 & 3 closed

DRAM CONFIGURATION

Size

Bank 0

P 0

Bank 1

P 1

Bank 0A

Bank 1A

512KB

(4) 44256

(2) 41256

NONE

NONE

NONE

NONE

640KB

(4) 44256

(2) 41256

(4) 4464

(2) 4164

NONE

NONE

1MB

(4) 44256

(2) 41256

(4) 44256

(2) 41256

NONE

NONE

2MB

NONE

NONE

NONE

NONE

(2) 1M x 9

NONE

4MB

(4) 441000

(2) 411000

(4) 441000

(2) 411000

NONE

NONE

4MB

NONE

NONE

NONE

NONE

(2) 1M x 9

(2) 1M x 9

CPU SPEED CONFIGURATION

System clock

Bus clock

DRAM speed

JP7

12MHz

8MHz asynch

100ns

Open

12MHz

6MHz synch

100ns

Closed

16MHz

8MHz synch

80ns

Closed

20MHz

8MHz asynch

60/70ns

Open

20MHz

10MHz synch

60/70ns

Closed

MISCELLANEOUS TECHNICAL NOTE

Note: The location of pin 1 is unidentified.