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Motherboards

• Biostar 1425/33/40/50 UCV
• Biostar 1425/33/40/50 AEV

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Biostar 1425UCV, 1433UCV, 1440UCV, 1450UCV A-D

• Manufacturer: Biostar
• Manu. Name: MB-1425/33/40/50 UCV
• CPU:
  • Supports 80486 SX/DX/DX2, OverDrive/P24T.
  • Supports 25/33/40/50 MHz CPU clock speed.
• Supports P24T, Cyrix Cx 486S CPU and Cyrix DX 487S
• Provides 238-pin BAZ PGA socket for 486DX/DX2, 487SX, 486Overdrive, P24T and Cx 486S.
• Memory:
  • 4 bank 30-pin 256KB/1/4/16MB SIMM sockets, 8 slots.
  • Supports Page Mode DRAM, 64MB max, 80ns required.
• Cache Memory: 32KB, 64KB, 128KB or 256KB.
• Bus: 3 VL, 6 16-bit ISA, 1 8-bit ISA
• BIOS: AMI Legal BIOS.

INSTALLATION: Jumper Settings

Cache RAM Size Select - JP5, JP6, JP7, JP9, JP10

Cache RAM Size	JP5	JP6	JP7	JP9	JP10	Tag Ram
32K	2-3 Closed	Open	Open	Open	Open	8 x 8K
64 KB	1-2 Closed	Open	Open	Closed	Open	8 x 8K
128 KB	2-3 Closed	2-3 Closed	Closed	Closed	Open	8 x 8K
256 KB	1-2 Closed	1-2 Closed	Closed	Closed	2-3 Closed	32K x 8
256 KB	1-2 Closed	1-2 Closed	Closed	Closed	1-2 Closed	16K x 8

CPU Clock Generator Select - JP21, JP22, JP23, JP27

JP21	JP22	JP23	JP27	CPU Clock
Closed	Open	Closed	Open	25MHz (DX2-50)
Closed	Closed	Open	Open	33MHz (DX2-66)
Open	Open	Closed	Closed	40MHz
Open	Closed	Open	Closed	50MHz

External Battery / CMOS Discharge - JP8

Procedure	Function
2-3 Closed	Maintain setup and extended setup data in CMOS for normal functioning (default)
3-4 Closed	To clear CMOS setup memory
Power off system, take off the cap of JP8 and then connect the external battery to JP8	Install external battery on board

Power Good Select - JP11

Procedure	Function
1-2 Closed	For power supply power good
2-3 Closed	For on board power good

CPU Type Select - JP12

Procedure	Function
1-2 Closed	One CPU on board (PQFP or PGA)
2-3 Closed	Two CPU on board (Enabled PGA and Disabled PQFP)

Monitor Type Select - JP14

Procedure	Function
1-2 Closed	Mono
2-3 Closed	Color

VESA Bus Address Sync/Async Select - JP19

JP19	VESA Bus Address
1-2 Closed	Asynchronous mode (for CPU speed 40/50MHZ only)
2-3 Closed	Synchronous mode

VESA Bus DATA Sync/Async Select - JP20

JP20	VESA Bus DATA
1-2 Closed	Synchronous mode
2-3 Closed	Asynchronous mode

VESA Bus (SLOTV2) Clock Select - JP25

JP25	VESA Bus Clock
1-2 Closed	Synchronous mode
2-3 Closed	Asynchronous mode

VESA Bus (SLOTV1) Clock Select - JP26

JP26	VESA Bus Clock
1-2 Closed	Synchronous mode
2-3 Closed	Asynchronous mode

Add-On Card Select - JP28

JP28	VESA Bus Clock
1-2 Closed	Normal Operation
2-3 Closed	Weitek Power 9000 VGA card

VESA Bus (SLOTV3) Clock Select - JP29

JP29	VESA Bus Clock
1-2 Closed	Synchronous mode
2-3 Closed	Asynchronous mode

VESA Bus (SLOTV2 & SLOTV3) Clock Select - JP30

JP30	VESA Bus Clock
1-2 Closed (NOTE: JP25 must be opened)	Synchronous mode
2-3 Closed	Asynchronous mode

INSTALLATION: Connectors - JP15

Biostar 1425AEV, 1433AEV, 1440AEV, 1450AEV

• Manufacturer: Biostar
• Manu. Name: MB-1425/33/40/50 AEV
• CPU:
  • Supports 80486 SX/DX/DX2, OverDrive/P24T.
  • Supports 25/33/40/50 MHz CPU clock speed.
• Memory:
  • 2 bank 30-pin 256KB/1/4MB SIMM sockets, 8 slots.
  • Supports Page Mode DRAM, 32MB max, 80ns required.
• Cache Memory: 64K, 128K, or 256KB.
• Bus: 2 VL, 5 16-bit ISA
• BIOS: AMI Legal BIOS.

INSTALLATION: Jumper Settings

CPU Clock Select (Engineer Test Pin) - JP4

JP5	CPU Clock Select
2-3 Closed	always set to 2-3

CPU Clock Select - JP5

JP5	CPU Clock Select
1-2 Closed	For 486DX-50MHz only
2-3 Closed	For other CPU Clock type

Tag RAM Size Select - JP6

JP6	Tag RAM Size Select
1-2 Closed	7 Bit Tag RAM
2-3 Closed	8 Bit Tag RAM

CPU Clock Select - JP10

JP10	CPU Clock Select
Closed	For 486DX-50MHz only
Open	For other CPU Clock type

Chip Type Select - JP10

JP10	Chip Type Select
Closed	For Dallas 1287
Open	For Battery & RTC 146818

Cache RAM Size Select - JP12, JP19

Cache RAM Size	JP12	JP19
64KB	Open	1-2 Closed
128 KB	1-2,3-4 Closed	2-3 Closed
256 KB	1-2,3-4,5-6 Closed	1-2 Closed

CPU Type Select - JP13, JP20

JP13	JP20	CPU Type
Open	1-2 Closed	486SX
1-2 Closed	2-3 Closed	487SX/486 OverDrive(TM)
2-3 Closed	2-3 Closed	486DX/486DX2

Monitor Type Select - JP14

Procedure	Function
1-2 Closed	Mono
2-3 Closed	Color

CMOS Discharge - JP16

Procedure	Function
1-2 Closed	To clear CMOS setup memory
2-3 Closed	To maintain setup data (default)

Engineer Test Pin - J01

Bus Wait State - J02

J02	Wait State
1-2 Closed	0 Wait State
2-3 Closed	1 Wait State

INSTALLATION: Connectors - JP15