AST Bravo LC 4/66d

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The Bravo LC 4/66d is a PC compatible desktop from AST Research. Based on the 80486 processor.

Gallery

Jumper Settings (94) (202594-XXX)

Processor

80486SX/80486DX/ODP486SX/Pentium Overdrive

Processor Speed

25/33MHz

Chip Set

AST

Max. Onboard DRAM

64MB

Cache

64/256KB

BIOS

AMI

Dimensions

330mm x 218mm

I/O Options

32-bit VESA local bus slot, floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), VGA port, VGA feature connector

NPU Options

None

 

CONNECTIONS

Purpose

Location

Purpose

Location

PS/2 mouse port

J12

IDE interface

J22

Parallel port

J13

Floppy drive interface

J24

Serial port 1

J14

Chassis fan power

J28

VGA port

J18

Front panel LED connector

J29

VGA feature connector

J19

32-bit VESA Local bus slot

SL1

Serial port 2

J20

   

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

VESA cache write through enabled

E1

pins 1 & 2 closed

 

VESA cache write back enabled

E1

pins 2 & 3 closed

»

Parallel port IRQ select IRQ7

E2

pins 1 & 2 closed

 

Parallel port IRQ select IRQ5

E2

pins 2 & 3 closed

»

On board video enabled

E7

Closed

 

On board video disabled

E7

Open

»

Monitor type select color

E8

Closed

 

Monitor type select monochrome

E8

Open

»

Factory configured - do not alter

E9

pins 1 & 2 closed

»

CMOS memory normal operation

E10

Closed

 

CMOS memory clear

E10

Open

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(1) 256K x 36

NONE

NONE

NONE

2MB

(1) 256K x 36

(1) 256K x 36

NONE

NONE

3MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

NONE

4MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

4MB

(1) 1M x 36

NONE

NONE

NONE

5MB

(1) 1M x 36

(1) 256K x 36

NONE

NONE

6MB

(1) 1M x 36

(1) 256K x 36

(1) 256K x 36

NONE

7MB

(1) 1M x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

8MB

(1) 1M x 36

(1) 1M x 36

NONE

NONE

9MB

(1) 1M x 36

(1) 1M x 36

(1) 256K x 36

NONE

10MB

(1) 1M x 36

(1) 1M x 36

(1) 256K x 36

(1) 256K x 36

12MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

NONE

13MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 256K x 36

16MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

16MB

(1) 4M x 36

NONE

NONE

NONE

17MB

(1) 4M x 36

(1) 256K x 36

NONE

NONE

18MB

(1) 4M x 36

(1) 256K x 36

(1) 256K x 36

NONE

19MB

(1) 4M x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

20MB

(1) 4M x 36

(1) 1M x 36

NONE

NONE

21MB

(1) 4M x 36

(1) 1M x 36

(1) 256K x 36

NONE

22MB

(1) 4M x 36

(1) 1M x 36

(1) 256K x 36

(1) 256K x 36

24MB

(1) 4M x 36

(1) 1M x 36

(1) 1M x 36

NONE

25MB

(1) 4M x 36

(1) 1M x 36

(1) 1M x 36

(1) 256K x 36

28MB

(1) 4M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

32MB

(1) 4M x 36

(1) 4M x 36

NONE

NONE

33MB

(1) 4M x 36

(1) 4M x 36

(1) 256K x 36

NONE

34MB

(1) 4M x 36

(1) 4M x 36

(1) 256K x 36

(1) 256K x 36

36MB

(1) 4M x 36

(1) 4M x 36

(1) 1M x 36

NONE

37MB

(1) 4M x 36

(1) 4M x 36

(1) 1M x 36

(1) 256K x 36

40MB

(1) 4M x 36

(1) 4M x 36

(1) 1M x 36

(1) 1M x 36

48MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

NONE

49MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 256K x 36

52MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 1M x 36

64MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

CACHE CONFIGURATION

Size

Bank 0

TAG

64KB

(8) 8K x 8

(1) 8K x 8

256KB

(8) 32K x 8

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

E12

E14

64KB

Open

Open

256KB

Closed

Closed

CPU TYPE CONFIGURATION

Type

E3

E4

E5

E6

E13

80486SX PQFP

2 & 3

2 & 3

2 & 3

1 & 2

Open

80486SX PGA

1 & 2

1 & 2

1 & 2

1 & 2

Closed

80486DX

2 & 3

2 & 3

2 & 3

1 & 2

Closed

ODP80486SX

2 & 3

2 & 3

2 & 3

1 & 2

Closed

Pentium Overdrive

2 & 3

1 & 2

2 & 3

1 & 2

Closed

Note: Jumper E6 set with pins 1 & 2 closed enables write through cache, pins 2 & 3 closed enabled write back cache. If write back is enabled, and pins 2 & 3 closed on jumper E1, write back mode is enabled for SL1.

CPU SPEED CONFIGURATION

Speed

E15

25MHz

Closed

33MHz

Open

VIDEO MEMORY CONFIGURATION

Size

Bank 0

Bank 1

512KB

(4) 256K x 4

NONE

1MB

(4) 256K x 4

(4) 256K x 4

Note: Bank O is factory installed and is not configurable.

Jumper Settings (LC2) (202560-XXX)

Processor

80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive

Processor Speed

25/33/50(internal)/66(internal)MHz

Chip Set

AST

Max. Onboard DRAM

64MB

Cache

64/256KB

BIOS

AST

Dimensions

330mm x 218mm

I/O Options

Floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), VGA feature connector, VGA port

NPU Options

None

 

CONNECTIONS

Purpose

Location

Purpose

Location

PS/2 mouse port

J12

Serial port 2

J20

Parallel port

J13

IDE interface

J22

Serial port 1

J14

Floppy drive interface

J24

VGA port

J18

Chassis fan power

J28

VGA feature connector

J19

Front panel connector

J29

USER CONFIGURABLE SETTINGS

Function

Jumper

Position

»

Monitor type select color

E4

Closed

 

Monitor type select monochrome

E4

Open

»

Video adapter enabled

E5

Closed

 

Video adapter disabled

E5

Open

»

CMOS memory normal operation

E6

Closed

 

CMOS memory clear

E6

Open

»

Parallel port IRQ select IRQ7

E12

pins 1 & 2 closed

 

Parallel port IRQ select IRQ5

E12

pins 2 & 3 closed

»

Factory configured - do not alter

E17

pins 1 & 2 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

1MB

(1) 256K x 36

NONE

NONE

NONE

2MB

(1) 256K x 36

(1) 256K x 36

NONE

NONE

3MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

NONE

4MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

4MB

(1) 1M x 36

NONE

NONE

NONE

5MB

(1) 1M x 36

(1) 256K x 36

NONE

NONE

6MB

(1) 1M x 36

(1) 256K x 36

(1) 256K x 36

NONE

7MB

(1) 1M x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

8MB

(1) 1M x 36

(1) 1M x 36

NONE

NONE

9MB

(1) 1M x 36

(1) 1M x 36

(1) 256K x 36

NONE

10MB

(1) 1M x 36

(1) 1M x 36

(1) 256K x 36

(1) 256K x 36

12MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

NONE

13MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 256K x 36

16MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

16MB

(1) 4M x 36

NONE

NONE

NONE

17MB

(1) 4M x 36

(1) 256K x 36

NONE

NONE

18MB

(1) 4M x 36

(1) 256K x 36

(1) 256K x 36

NONE

19MB

(1) 4M x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

20MB

(1) 4M x 36

(1) 1M x 36

NONE

NONE

21MB

(1) 4M x 36

(1) 1M x 36

(1) 256K x 36

NONE

22MB

(1) 4M x 36

(1) 1M x 36

(1) 256K x 36

(1) 256K x 36

24MB

(1) 4M x 36

(1) 1M x 36

(1) 1M x 36

NONE

25MB

(1) 4M x 36

(1) 1M x 36

(1) 1M x 36

(1) 256K x 36

DRAM CONFIGURATION (CON’T)

28MB

(1) 4M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

32MB

(1) 4M x 36

(1) 4M x 36

NONE

NONE

33MB

(1) 4M x 36

(1) 4M x 36

(1) 256K x 36

NONE

34MB

(1) 4M x 36

(1) 4M x 36

(1) 256K x 36

(1) 256K x 36

36MB

(1) 4M x 36

(1) 4M x 36

(1) 1M x 36

NONE

37MB

(1) 4M x 36

(1) 4M x 36

(1) 1M x 36

(1) 256K x 36

40MB

(1) 4M x 36

(1) 4M x 36

(1) 1M x 36

(1) 1M x 36

48MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

NONE

49MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 256K x 36

52MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 1M x 36

64MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

CACHE CONFIGURATION

Size

Bank 0

TAG

64KB

(8) 8K x 8

(1) 8K x 8

256KB

(8) 32K x 8

(1) 32K x 8

CACHE JUMPER CONFIGURATION

Size

E1

E2

E3

64KB

Open

Open

Open

256KB

Closed

Closed

Closed

CPU UPGRADE CONFIGURATION

Type

E11

E13

E14

E15

E16

None

Open

Open

1 & 2

1 & 2

1 & 2

80846SX

Closed

Open

1 & 2

1 & 2

1 & 2

80487SX

Closed

Closed

1 & 2

1 & 2

2 & 3

80486DX/DX2

Closed

Closed

2 & 3

1 & 2

2 & 3

Overdrive (ODPR)

Closed

Closed

2 & 3

1 & 2

2 & 3

Overdrive (ODP)

Closed

Closed

1 & 2

1 & 2

2 & 3

Overdrive (DX2)

Closed

Closed

1 & 2

2 & 3

2 & 3

CPU SPEED CONFIGURATION

Speed

E9

E10

25MHz

Closed

Closed

33MHz

Open

Closed

50iMHz

Closed

Closed

66iMHz

Open

Closed

VIDEO MEMORY CONFIGURATION

Size

Bank 0

Bank 1

512KB

(4) 256KB x 4

NONE

1MB

(4) 256KB x 4

(4) 256KB x 4

Note: Bank O is factory installed and is not configurable.

Jumper Settings

Processor

80486SX/80486DX2 (on external CPU/Cache module)

Processor Speed

25/66I MHz (only with external CPU/Cache module)

Chip Set

AST

Max. Onboard DRAM

64MB

SRAM Cache

256KB (on external CPU/Cache module)

BIOS

AST

Dimensions

254mm x 338mm

I/O Options

Bus mouse port, CPU/Cache upgrade module, floppy drive interface, IDE interface, LAN module, parallel port, serial port (2), VGA port

NPU Options

None

 

CONNECTIONS

Purpose

Location

Purpose

Location

Serial port 2 (COM2)

J12

Floppy drive interface

J24

Parallel port

J13

External speaker

J27

Bus mouse port

J14

Fan power

J28

LAN module

J15 & J16

Front panel switches & LEDs

J29

Serial port 1 (COM1)

J17

Feature connector

J46

VGA port

J18

CPU/Cache upgrade module

J50, J51, J52, J53

VGA pass-through

J19

IDE interface LED

J100

IDE interface

J22

 

 

USER CONFIGURABLE SETTINGS

Function

Jumper/Switch

Position

»

Factory configured - do not alter

E1

open

»

Factory configured - do not alter

E2

pins 2 & 3 closed

»

Parallel port interrupt select IRQ7

E5

pins 2 & 3 closed

 

Parallel port interrupt select IRQ5

E5

pins 1 & 2 closed

»

CMOS memory normal operation

E6

open

 

CMOS memory clear

E6

closed

»

VGA port enabled

SW1/switch 1

closed

 

VGA port disabled

SW1/switch 1

open

»

Password check enabled

SW1/switch 2

open

 

Password check disabled

SW1/switch 2

closed

»

Factory configured - do not alter

SW1/switch 3

open

»

Factory configured - do not alter

SW1/switch 4

open

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

2MB

(1) 256K x 36

(1) 256K x 36

NONE

NONE

4MB

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

(1) 256K x 36

4MB

(1) 1M x 36

NONE

NONE

NONE

8MB

(1) 1M x 36

(1) 1M x 36

NONE

NONE

16MB

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

(1) 1M x 36

16MB

(1) 4M x 36

NONE

NONE

NONE

32MB

(1) 4M x 36

(1) 4M x 36

NONE

NONE

64MB

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

(1) 4M x 36

VRAM CONFIGURATION

Size

VRAM

512KB

(4) 44256

 

PROCESSOR/CACHE MODULE

CONNECTIONS

Purpose

Location

CPU/Cache upgrade module

J50, J51, J52, J53

Note: Connections are on the back side of the module and correspond to the connector with the same label on the motherboard.

CACHE CONFIGURATION

Size

Cache SRAM

256KB

(8) 256K x 1

CPU/CACHE MODULE TYPE CONFIGURATION

Module Type

Jumper E4

Jumper E5

Jumper E7

Jumper E8

 

CPU only

open

closed

closed

closed

 

Cache only

closed

open

open

open

»

CPU and Cache

closed

closed

open

open

Note:These settings are given for information only and should not be changed.

CPU SPEED CONFIGURATION

Internal

External

Jumper E1

Jumper E3

Jumper E6

 

25MHz

25MHz

closed

closed

open

 

33MHz

33MHz

open

closed

open

 

50MHz

25MHz

closed

closed

open

»

66MHz

33MHz

open

closed

open

Note:These settings are given for information only and should not be changed.

CPU TYPE CONFIGURATION

CPU Type

Jumper E2

Jumper E9

Jumper E10

Jumper E11

»

80486DX2

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

closed

 

ODP486SX

pins 1 & 2 closed

pins 2 & 3 closed

pins 1 & 2 closed

closed

 

80486DX

pins 2 & 3 closed

pins 2 & 3 closed

pins 2 & 3 closed

closed

 

80487SX

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

closed

 

80486SX

pins 1 & 2 closed

pins 2 & 3 closed

pins 2 & 3 closed

open

 

None

open

open

open

open

Note:These settings are given for information only and should not be changed.

See Also