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MGI 486

MYLEX CORPORATION

MGI 486

Processor

80486SX/80486SX2/UMCU5/CX486DX/AM486DX/AM486DXL/80486DX/ CX486DX2/ AM486DX2/AM486DXL2/80486DX2/80486DX4/P24D/Pentium Overdrive

Processor Speed

25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz

Chip Set

SIS

Max. Onboard DRAM

64MB

Cache

64/128/256/512KB

BIOS

Award

Dimensions

250mm x 220mm

I/O Options

32-bit VESA local bus slots (3), green PC connector

NPU Options

None

CONNECTIONS

Purpose

Location

Purpose

Location

Green PC connector

D4

Reset switch

J5

Green PC connector

J1

Turbo switch

J6

Power LED & keylock

J2

Turbo LED

J7

Speaker

J3

Green PC connector

JP13

External battery

J4

32-bit VESA local bus slots

SL1 - SL3

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

Ľ

CMOS memory normal operation

JP11

pins 1 & 2 closed

 

CMOS memory clear

JP11

pins 2 & 3 closed

Ľ

Factory configured - do not alter

RP1

N/A

DRAM CONFIGURATION (OPTION 1)

Size

Bank 0

Bank 1

Bank 2

1MB

(4) 256K x 9

NONE

NONE

4MB

(4) 1M x 9

NONE

NONE

16MB

(4) 4M x 9

NONE

NONE

64MB

(4) 16M x 9

NONE

NONE

DRAM CONFIGURATION (OPTION 2)

Size

Bank 0

Bank 1

Bank 2

1MB

NONE

(1) 256K x 36

NONE

2MB

NONE

(1) 256K x 36

(1) 256K x 36

4MB

NONE

(1) 1M x 36

NONE

5MB

NONE

(1) 256K x 36

(1) 1M x 36

8MB

NONE

(1) 1M x 36

(1) 1M x 36

16MB

NONE

(1) 4M x 36

NONE

20MB

NONE

(1) 1M x 36

(1) 4M x 36

32MB

NONE

(1) 4M x 36

(1) 4M x 36

DRAM CONFIGURATION (OPTION 3)

Size

Bank 0

Bank 1

Bank 2

2MB

NONE

(1) 512K x 36

NONE

8MB

NONE

(1) 2M x 36

NONE

10MB

NONE

(1) 512K x 36

(1) 2M x 36

16MB

NONE

(1) 2M x 36

(1) 2M x 36

32MB

NONE

(1) 8M x 36

NONE

40MB

NONE

(1) 2M x 36

(1) 8M x 36

64MB

NONE

(1) 8M x 36

(1) 8M x 36

DRAM CONFIGURATION (OPTION 4)

Size

Bank 0

Bank 1

Bank 2

2MB

(4) 256K x 9

(1) 256K x 36

NONE

5MB

(4) 256K x 9

(1) 1M x 36

NONE

6MB

(4) 256K x 9

(1) 256K x 36

(1) 1M x 36

8MB

(4) 1M x 9

(1) 1M x 36

NONE

12MB

(4) 1M x 9

(1) 1M x 36

(1) 1M x 36

18MB

(4) 256K x 9

(1) 256K x 36

(1) 4M x 36

20MB

(4) 1M x 9

(1) 4M x 36

NONE

24MB

(4) 1M x 9

(1) 1M x 36

(1) 4M x 36

32MB

(4) 4M x 9

(1) 4M x 36

NONE

36MB

(4) 1M x 9

(1) 4M x 36

(1) 4M x 36

48MB

(4) 4M x 9

(1) 4M x 36

(1) 4M x 36

DRAM CONFIGURATION (OPTION 5)

Size

Bank 0

Bank 1

Bank 2

12MB

(4) 1M x 9

(1) 2M x 36

NONE

16MB

(4) 1M x 9

(1) 2M x 36

(1) 1M x 36

36MB

(4) 1M x 9

(1) 8M x 36

NONE

48MB

(4) 4M x 9

(1) 8M x 36

NONE

64MB

(4) 4M x 9

(1) 8M x 36

(1) 4M x 36

DRAM RESISTOR CONFIGURATION

Setting

RP7

RP8

RP9

RP10

Option 1

Not installed

Not installed

Not installed

Installed

Option 2

Not installed

Installed

Not installed

Not installed

Option 3

Installed

Not installed

Not installed

Not installed

Option 4

Not installed

Not installed

Not installed

Installed

Option 5

Not installed

Not installed

Installed

Not installed

CACHE CONFIGURATION

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) 16K x 8 or (1) 32K x 8

256KB

(4) 64K x 8

NONE

(1) 16K x 8 or (1) 32K x 8

512KB

(4) 64K x 8

(4) 64K x 8

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

JP9

JP20

64KB

pins 1 & 2 closed

pins 1 & 2 closed

128KB

pins 2 & 3 closed

pins 1 & 2 closed

256KB

pins 2 & 3 closed

pins 1 & 2 closed

256KB

pins 2 & 3 closed

pins 1 & 2 closed

512KB

pins 2 & 3 closed

pins 2 & 3 closed

CACHE RESISTOR CONFIGURATION

Size

RP15

RP16

RP17

RP18

RP19

64KB

Installed

Not installed

Not installed

Not installed

Not installed

128KB

Not installed

Installed

Not installed

Not installed

Not installed

256KB

Not installed

Not installed

Installed

Not installed

Not installed

256KB

Not installed

Not installed

Not installed

Installed

Not installed

512KB

Not installed

Not installed

Not installed

Not installed

Installed

CPU TYPE CONFIGURATION

Type

JP3

JP17

JP18

JP21

JP23

80486SX

2 & 3

2 & 3

1 & 2

1 & 2

1 & 2

80486SX2

2 & 3

2 & 3

1 & 2

1 & 2

1 & 2

UMCU5

2 & 3

2 & 3

1 & 2

1 & 2

1 & 2

CX486DX

1 & 2

1 & 2

1 & 2

1 & 2

1 & 2

80486DX

2 & 3

2 & 3

1 & 2

1 & 2

1 & 2

80486DX2

2 & 3

2 & 3

1 & 2

1 & 2

1 & 2

80486DX4

2 & 3

2 & 3

1 & 2

1 & 2

1 & 2

P24D

2 & 3

2 & 3

1 & 2

1 & 2

1 & 2

P24T

2 & 3

2 & 3

1 & 2

1 & 2

2 & 3

Note: Pins designated should be in the closed position.

CPU TYPE CONFIGURATION (CONíT)

Type

RP3

RP4

RP5

RP6

RP30

RP31

80486SX

Not installed

Not installed

Installed

Not installed

Not installed

Installed

80486SX2

Not installed

Not installed

Installed

Not installed

Not installed

Installed

UMCU5

Not installed

Not installed

Installed

Not installed

Not installed

Installed

CX486DX

Installed

Not installed

Not installed

Not installed

Installed

Not installed

80486DX

Installed

Not installed

Not installed

Not installed

Not installed

Installed

80486DX2

Installed

Not installed

Not installed

Not installed

Not installed

Installed

80486DX4

Installed

Not installed

Not installed

Not installed

Not installed

Installed

P24D

Not installed

Installed

Not installed

Installed

Not installed

Not installed

P24T

Installed

Not installed

Not installed

Not installed

Not installed

Installed

CPU SPEED CONFIGURATION (MX8315/UM9515 CLOCK)

Speed

JP5

JP6

JP7

25MHz

Open

Open

Closed

33MHz

Closed

Closed

Closed

40MHz

Open

Closed

Closed

50iMHz

Open

Open

Closed

50MHz

Closed

Open

Open

66iMHz

Closed

Closed

Closed

75iMHz

Open

Open

Closed

100iMHz

Closed

Closed

Closed

CPU SPEED CONFIGURATION (IMI SC466 CLOCK)

Speed

JP5

JP6

JP7

25MHz

Open

Open

Open

33MHz

Closed

Closed

Open

40MHz

Open

Closed

Open

50iMHz

Open

Open

Open

50MHz

Closed

Open

Open

66iMHz

Closed

Closed

Open

75iMHz

Open

Open

Open

100iMHz

Closed

Closed

Open

CPU CORE FREQUENCY CONFIGURATION

CPU

JP22

JP27

Cyrix

pins 1 & 2 closed

Open

AMD486DX2

Open

Closed

Intel 80486DX (3x)

Open

Open

AMD486DX4

Open

Open

Intel 80486DX4 (2x)

pins 2 & 3 closed

Open

CPU VOLTAGE CONFIGURATION

Voltage

JP1

JP2

JP4

JP24

3.3v

Open

Open

Open

pins 1 & 2 closed

4.0v

Open

Open

Open

pins 2 & 3 closed

5.0v

Closed

Closed

Closed

Open

VESA WAIT STATE CONFIGURATION

Wait states

JP15

0 wait states

pins 1 & 2 closed

1 wait state

pins 2 & 3 closed

BUS SPEED CONFIGURATION

CPU speed

JP16

<= 33MHz

pins 1 & 2 closed

> 33MHz

pins 2 & 3 closed