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DC 386 WB WRITE BACK-CACHE

DASH COMPUTER, INC.

DC 386 WB WRITE BACK-CACHE

Processor

80386DX

Processor Speed

25/33/40MHz

Chip Set

OPTI

Max. Onboard DRAM

32MB

Cache

32/64/128/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit external memory card slot

NPU Options

80387

CONNECTIONS

Purpose

Location

Purpose

Location

Power LED & keylock

J23

Reset switch

SW1

Speaker

J24

Turbo switch

SW2

32-bit external memeory card

S1

Turbo LED

SW3

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Monitor type select monochrome

JP1

open

 

Monitor type select color

JP1

closed

CMOS memory normal operation

JP2

pins 2 & 3 closed

 

CMOS memory clear

JP2

pins 1 & 2 closed

Bus speed select ATCLK/6

JP3

pins 1 & 2 closed

 

Bus speed select ATCLK/8

JP3

open

Note:Pins 3 and 4 on JP3 are not used

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) 256K x 9

(4) 1M x 9

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

20MB

(4) 1M x 9

(4) 4M x 9

32MB

(4) 4M x 9

(4) 4M x 9

CACHE JUMPER CONFIGURATION

Size

JP5

JP6

JP7

JP8

JP9

JP10

32KB

pins 1 & 2

pins 1 & 2

pins 1 & 2

open

pins 2 & 3

pins 2 & 3

64KB

pins 2 & 3

pins 1 & 2

pins 1 & 2

open

pins 2 & 3

pins 1 & 2

128KB

pins 2 & 3

pins 1 & 2

pins 2 & 3

closed

pins 2 & 3

pins 1 & 2

256KB

pins 2 & 3

pins 2 & 3

pins 2 & 3

closed

pins 1 & 2

pins 1 & 2

Note:Pins designated should be in the closed position

CACHE CONFIGURATION

Size

Cache SRAM

Location

TAG (U32 & U33)

Dirty Bit (U42)

32KB

(4) 8K x 8

Bank 0

(2) 4K x 4

(1) 4K x 4

64KB

(8) 8K x 8

Banks 0 & 1

(2) 4K x 4

(1) 4K x 4

128KB

(4) 32K x 8

Bank 0

(2) 16K x 4

(1) 16K x 1

256KB

(8) 32K x 8

Banks 0 & 1

(2) 16K x 4

(1) 16K x 1