BRAVO MT (202528-XXX) Motherboard Settings and Configuration

AST RESEARCH, INC.

BRAVO MT (202528-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
Power LED & keylock
E1
VGA port
J18
Reset switch
E3
VGA feature connector
J19
IDE interface LED
E4
IDE interface
J22
PS/2 mouse port
J12
Floppy drive interface
J24
Parallel port
J13
Chassis fan power
J28
Serial ports (2)
J10 & J44

Note: Serial port J44 is located under J10.

USER CONFIGURABLE SETTINGS
Function
Jumper/Switch
Position
»
CMOS memory normal operation
E5
Open

CMOS memory clear
E5
Closed
»
Factory configured - do not alter
E14
pins 1 & 2 closed
»
Parallel port IRQ select IRQ7
E15
pins 1 & 2 closed

Parallel port IRQ select IRQ5
E15
pins 2 & 3 closed
»
Factory configured - do not alter
E800
pins 1 & 2 closed
»
Factory configured - do not alter
E801
pins 2 & 3 closed
»
Power management enabled
E802
pins 1 & 2 closed

Power management disabled
E802
pins 2 & 3 closed
»
Factory configured - do not alter
E803
pins 1 & 2 closed
»
Factory configured - do not alter
E804
pins 1 & 2 closed
»
On board video enabled
SW1/1
Off

On board video disabled
SW1/1
On
»
POST type select normal
SW1/2
Off

POST type select test loop
SW1/2
On
»
Boot type select normal
SW1/3
Off

Boot type select flash BIOS update
SW1/3
On
»
Password enabled
SW1/4
Off

Password disabled
SW1/4
On
»
Monitor type select color
SW1/5
On

Monitor type select monochrome
SW1/5
Off
»
Factory configured - do not alter
SW1/6
Off
»
Factory configured - do not alter
SW1/7
Off
»
System setup type select allow access
SW1/8
Off

System setup type select deny access
SW1/8
On

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
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
E6
E7
E8
64KB
pins 1 & 2 closed
Open
Open
256KB
pins 2 & 3 closed
Closed
Closed
Note: Some later versions have omitted jumper E6.

CPU UPGRADE CONFIGURATION
Type
E9
E10
E11
E12
E13
None
N/A
N/A
N/A
N/A
2 & 3
80486SX
Open
2 & 3
2 & 3
2 & 3
1 & 2
80487SX
Closed
1 & 2
1 & 2
2 & 3
1 & 2
80486DX/DX2
Closed
2 & 3
1 & 2
2 & 3
2 & 3
Overdrive (ODPR)
Closed
2 & 3
1 & 2
2 & 3
1 & 2
Overdrive (ODP)
Closed
1 & 2
1 & 2
2 & 3
2 & 3
Overdrive (P24T)
Closed
1 & 2
1 & 2
1 & 2
2 & 3
Note: Pins designated should be in the closed position.

CPU SPEED CONFIGURATION
Speed
E16
25MHz
Open
33MHz
Closed
50iMHz
Open
66iMHz
Closed

VIDEO MEMORY CONFIGURATION
Size
Bank 0
Bank 1
Bank 2
512KB
(1) 256K x 16
NONE
NONE
1MB
(1) 256K x 16
(1) 256K x 16
NONE
2MB
(1) 256K x 16
(1) 256K x 16
(2) 256K x 16
Note: Bank 0 is factory installed and is not configurable.

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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
Power LED & keylock	E1	VGA port	J18
Reset switch	E3	VGA feature connector	J19
IDE interface LED	E4	IDE interface	J22
PS/2 mouse port	J12	Floppy drive interface	J24
Parallel port	J13	Chassis fan power	J28
Serial ports (2)	J10 & J44
Note: Serial port J44 is located under J10.

USER CONFIGURABLE SETTINGS
Function		Jumper/Switch	Position
»	CMOS memory normal operation	E5	Open
	CMOS memory clear	E5	Closed
»	Factory configured - do not alter	E14	pins 1 & 2 closed
»	Parallel port IRQ select IRQ7	E15	pins 1 & 2 closed
	Parallel port IRQ select IRQ5	E15	pins 2 & 3 closed
»	Factory configured - do not alter	E800	pins 1 & 2 closed
»	Factory configured - do not alter	E801	pins 2 & 3 closed
»	Power management enabled	E802	pins 1 & 2 closed
	Power management disabled	E802	pins 2 & 3 closed
»	Factory configured - do not alter	E803	pins 1 & 2 closed
»	Factory configured - do not alter	E804	pins 1 & 2 closed
»	On board video enabled	SW1/1	Off
	On board video disabled	SW1/1	On
»	POST type select normal	SW1/2	Off
	POST type select test loop	SW1/2	On
»	Boot type select normal	SW1/3	Off
	Boot type select flash BIOS update	SW1/3	On
»	Password enabled	SW1/4	Off
	Password disabled	SW1/4	On
»	Monitor type select color	SW1/5	On
	Monitor type select monochrome	SW1/5	Off
»	Factory configured - do not alter	SW1/6	Off
»	Factory configured - do not alter	SW1/7	Off
»	System setup type select allow access	SW1/8	Off
	System setup type select deny access	SW1/8	On

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
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	E6	E7	E8
64KB	pins 1 & 2 closed	Open	Open
256KB	pins 2 & 3 closed	Closed	Closed
Note: Some later versions have omitted jumper E6.

CPU UPGRADE CONFIGURATION
Type	E9	E10	E11	E12	E13
None	N/A	N/A	N/A	N/A	2 & 3
80486SX	Open	2 & 3	2 & 3	2 & 3	1 & 2
80487SX	Closed	1 & 2	1 & 2	2 & 3	1 & 2
80486DX/DX2	Closed	2 & 3	1 & 2	2 & 3	2 & 3
Overdrive (ODPR)	Closed	2 & 3	1 & 2	2 & 3	1 & 2
Overdrive (ODP)	Closed	1 & 2	1 & 2	2 & 3	2 & 3
Overdrive (P24T)	Closed	1 & 2	1 & 2	1 & 2	2 & 3
Note: Pins designated should be in the closed position.

CPU SPEED CONFIGURATION
Speed	E16
25MHz	Open
33MHz	Closed
50iMHz	Open
66iMHz	Closed

VIDEO MEMORY CONFIGURATION
Size	Bank 0	Bank 1	Bank 2
512KB	(1) 256K x 16	NONE	NONE
1MB	(1) 256K x 16	(1) 256K x 16	NONE
2MB	(1) 256K x 16	(1) 256K x 16	(2) 256K x 16
Note: Bank 0 is factory installed and is not configurable.