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U486 (ML-U486DX50/33HS/V1)

UNIDENTIFIED

U486 (ML-U486DX50/33HS/V1)

Processor

80486SX/80487SX/80486DX

Processor Speed

33/50MHz

Chip Set

UMC

Video Chip Set

None

Maximum Onboard Memory

32MB

Maximum Video Memory

None

Cache

64/128/256KB

BIOS

AMI

Dimensions

254mm x 218mm

I/O Options

None

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

External battery

J3

Turbo LED

J11

Speaker

J8

Reset switch

J12

Power LED & keylock

J9

Turbo switch

JP1

Turbo switch

J10

   

USER CONFIGURABLE SETTINGS

Function

Label

Position

Battery type select internal

J1

Closed

 

Battery type select external

J1

Open

NPU synchronous with CPU

J5

Pins 2 & 3 closed

 

NPU asynchronous with CPU

J5

Pins 1 & 2 closed

Monitor type select color

J6

Closed

 

Monitor type select monochrome

J6

Open

Factory configured - do not alter

J7

Unidentified

CMOS memory normal operation

J13

Pins 1 & 2 closed

 

CMOS memory clear

J13

Pins 2 & 3 closed

Factory configured - do not alter

W4

Unidentified

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 CONFIGURATION (33MHZ CPU)

Size

Bank 0

Bank 1

TAG

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

128KB

(4) 32K x 8

None

(1) 8K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

Note: The location of banks 0 & 1 are unidentified. The speed for the cache is 15ns and 25ns for the TAG.

CACHE CONFIGURATION (50MHZ CPU)

Size

Bank 0

Bank 1

TAG

64KB

(4) 8K x 8

(4) 8K x 8

(1) 8K x 8

128KB

(4) 32K x 8

None

(1) 8K x 8

256KB

(4) 32K x 8

(4) 32K x 8

(1) 32K x 8

Note: The location of banks 0 & 1 are unidentified. The speed for the cache is 15ns and 20ns for the TAG.

CACHE JUMPER CONFIGURATION

Size

W1

W2

W3

W5

W6

W7

W8

W9

64KB

1 & 2

Open

1 & 2

1 & 2

Open

Open

Open

Open

128KB

2 & 3

1 & 2

1 & 2

2 & 3

Closed

Open

Open

Closed

256KB

1 & 2

2 & 3

2 & 3

2 & 3

Closed

Closed

Closed

Closed

Note: Pins designated should be in the closed position.

CPU CLOCK SELECTION

Setting

W10

1x

Open

2x

Closed

CPU TYPE SELECTION

Type

W11

W12

80486SX

Pins 2 & 3 closed

Open

80487SX

Pins 1 & 2, 3 & 4 closed

Pins 2 & 3 closed

80486DX

Pins 1 & 2, 3 & 4 closed

Pins 1 & 2 closed

TURBO SELECTION

Setting

J10

JP1

Enabled

Closed

Open

Disabled

Open

Closed