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386C MK III Motherboard Settings and Configuration






ARNOS INSTRUMENTS & COMPUTER SYSTEMS, INC.

386C MK III

Processor

80386DX

Processor Speed

33/40MHz

Chip Set

None

Max. Onboard DRAM

16MB

Cache

64/128/256KB

BIOS

Phoenix

Dimensions

330mm x 218mm

I/O Options

None

NPU Options

80387/3167

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

X4

Turbo switch

X11

Status display

X6

Reset switch

X15

Speaker

X7

Turbo LED

X16

Power LED & keylock

X8

   

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

Battery installed < 5VDC

S1

pins 1 & 2 closed

 

Battery installed > 5VDC

S1

pins 2 & 3 closed

CPU speed select switchable at keyboard

S2

pins 1 & 2 closed

 

CPU speed select switchable at turbo switch

S2

pins 2 & 3 closed

Monitor type select monochrome

S3

Open

 

Monitor type select color

S3

Closed

NPU disabled

SW1/1

Off

 

NPU enabled

SW1/1

On

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

8MB

(4) 1M x 9

(4) 1M x 9

16MB

(4) 4M x 9

NONE

DRAM SWITCH CONFIGURATION

Size

SW1/2

SW1/3

SW1/4

1MB

On

On

On

2MB

On

On

Off

4MB

On

Off

On

8MB

On

Off

Off

16MB

Off

On

On

CACHE CONFIGURATION

Size

Bank 0

Bank 1

TAG (D52)

TAG (D56)

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

(1) 8K x 8

128KB

(4) 32K x 8

NONE

(1) 32K x 8

NONE

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

(1) 32K x 8

Note: Bank 0 = D17, D27, D35, & D39. Bank 1 = D9, D26, D28, & D44.










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