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UMC-386 (MS-3131 Ver. 1.1)

COMPUTREND SYSTEMS, INC.

UMC-386 (MS-3131 Ver. 1.1)

Processor

80386DX

Processor Speed

33/40MHz

Chip Set

UMC

Max. Onboard DRAM

32MB

SRAM Cache

32/64/128/256KB

BIOS

AMI

Dimensions

220mm x 220mm

I/O Options

Auxiliary keyboard connector

NPU Options

80387

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J1

Turbo switch

J2/15 - 17

Power LED & keylock

J2/1 - 5

Turbo LED

J2/12 & 13

Speaker

J2/7 - 10

Auxiliary keyboard

KB2

Reset switch

J2/19 & 20

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Monitor type select monochrome

JP1

open

 

Monitor type select color

JP1

closed

NPU disabled

JP3

JP9

open

open

 

NPU endabled

JP3

JP9

closed

closed

Battery select internal

J1

pins 2 & 3 closed

 

battery select external

J1

connected

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

32MB

(4) 4M x 9

(4) 4M x 9

CACHE JUMPER CONFIGURATION

Size

JP4

JP5

JP6

JP7

JP8

JP11

JP12

JP13

32KB

open

open

pins 2 & 3

pins 1 & 2

pins 1 & 2

pins 2 & 3

pins 1 & 2

open

64KB

open

open

pins 2 & 3

pins 1 & 2

pins 1 & 2

pins 1 & 2

pins 2 & 3

closed

128KB

closed

open

pins 1 & 2

pins 2 & 3

pins 1 & 2

pins 1 & 2

pins 2 & 3

closed

256KB

closed

closed

pins 2 & 3

pins 2 & 3

pins 2 & 3

pins 1 & 2

pins 2 & 3

closed

Note:Pins designated should be in the closed position.

CACHE CONFIGURATION

Size

Cache SRAM

Location

TAG

32KB

(4) 8K x 8

Bank 0

(1) 8K x 8

64KB

(8) 8K x 8

Banks 0 & 1

(1) 8K x 8

128KB

(4) 32K x 8

Bank 0

(1) 8K x 8

256KB

(8) 32K x 8

Banks 0 & 1

(1) 32K x 8