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DT-423S4L (Revision C2 and earlier)

DD & TT ENTERPRISE USA COMPANY

DT-423S4L (Revision C2 and earlier)

Processor

80486SX/80487SX/80486DX

Processor Speed

20/25/33/50MHz

Chip Set

Symphony

Max. Onboard DRAM

32MB

Cache

64/256/1024KB

BIOS

AMI/MR

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

4167

CONNECTIONS

Purpose

Location

Purpose

Location

Speaker

JP17

Turbo switch

JP20

Turbo LED

JP18

Power LED & keylock

JP21

Reset switch

JP19

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Password check disabled

JP2

Open

 

Password check enabled

JP2

Closed

Post-write buffer wait states select zero

JP12

Closed

 

Post-write buffer wait state select one

JP12

Open

Cache burst fill cycle select 2-1-1-1

JP16

Open

 

Cache burst fill cycle select 3-2-2-2

JP16

Closed

Note:The oscillator installed at X1 must match the speed of the CPU installed. (iOSC/1)

DRAM CONFIGURATION

Size

Bank 0

Bank 1

1MB

(4) 256K x 9

NONE

2MB

(4) 256K x 9

(4) 256K x 9

4MB

(4) 1M x 9

NONE

5MB

(4) 1M x 9

(4) 256K x 9

5MB

(4) 256K x 9

(4) 1M x 9

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

17MB

(4) 4M x 9

(4) 256K x 9

20MB

(4) 4M x 9

(4) 1M x 9

20MB

(4) 1M x 9

(4) 4M x 9

32MB

(4) 4M x 9

(4) 4M x 9

CACHE CONFIGURATION

Size

Bank 0

TAG

64KB

(8) 8K x 8

(1) 8K x 8

256KB

(8) 32K x 8

(1) 32K x 8

1024KB

(8) 128K x 8

(1) 128K x 8

CACHE JUMPER CONFIGURATION

Size

JP8

JP9

JP11

JP13

JP14

64KB

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

256KB

2 & 3

2 & 3

2 & 3

1 & 2

1 & 2

1024KB

2 & 3

2 & 3

2 & 3

2 & 3

2 & 3

Note:Pins designated should be in the closed position.

CPU TYPE CONFIGURATION

Type

JP3

JP4

JP5

80486SX

Open

Open

pins 2 & 3 closed

80487SX

Closed

pins 2 & 3 closed

pins 1 & 2 closed

80486DX

Closed

pins 1 & 2 closed

pins 1 & 2 closed

CPU SPEED CONFIGURATION

Speed

JP7

JP10

iOSC/2 (use when CPU speed <= 33MHz)

pins 2 & 3 closed

Open

iOSC/1 (use when CPU speed > 33MHz)

pins 1 & 2 closed

Closed

SYSTEM READY CONFIGURATION

Setting

JP6

JP15

SYSTEM READY signal select extended

pins 2 & 3 closed

Closed

SYSTEM READY signal select non-extended

pins 1 & 2 closed

Open