MB-84XXUUC
MANUAL FOR MB-84XXUUC MOTHERBOARD FROM BIOSTAR

JP 3 Flash Memory Program Voltage Select

1-2 Closed : +12V Flash memory used

2-3 Closed : +5 V Flash memory used

open : Eprom used (standard on motherboard = EPROM)

JP 6 DS12887A Cleart Select

1-2 Closed : Normal Operation (default)

1-2,3-4 Closed : Clear R.T.C. Module IC

Procedure For clearing bios :

POWER OFF --> JP6 3-4 CLOSED --> Power On --> After MEM count turn off

--> JP6 3-4 OPEN --> POWER ON.

JP 13 : Suspend Mode Toggle Switch

Open : Normal Operation

Closed : Suspend

Intel/AMD : Jp 22 1-2 And jp23 1-2 CLOSED

Cyrix : Jp22 2-3 And Jp 23 1-2 CLOSED

UMC: Jp22 1-2, And Jp 23 2-3 CLOSED

JP 5 ,JP 7 ,JP 8 : CPU Clock Select

20 Mhz : All jumpers OPEN

25 Mhz : JP 5, JP 7 OPEN, JP 8 CLOSED

33 Mhz : All Jumpers CLOSED

40 Mhz : JP 5 OPEN, JP 7 and JP 8 CLOSED

50 Mhz : JP 5 CLOSED, JP 7 and JP 8 OPEN

JP 14,18,19 : CPU Voltage Select

3.3 Volt : JP 14 (1-2) CLOSED, JP 18 (1-2) CLOSED, JP 19 (1-2) CLOSED.

4.0 Volt : JP 14 (2-3) CLOSED, JP 18 (1-2) CLOSED, JP 19 (1-2) CLOSED.

5.0 Volt : JP 14 All OPEN, JP 18 (2-3) CLOSED, JP 19 (2-3) CLOSED.

!!!! NOTE :

1) MB Ver.1/2 provide jumpers jp18/jp19 and support 3.3/5V CPU only

2) MB Ver.3 and afterwards provide also JP 14 and supports also 4V

3) When 3.3 or 4 Voltage CPU is installed you must have a SHARP PQ30RV21 (Regulator) installed on the motherboard.

CPU TYPE SELECTION :

iNTEL 486SL SX :

JP 27 ,30,33,34,35,41 OPEN

JP 28/29/31 CLOSED

JP 32 : (2-3), (4-5) CLOSED

JP 36,39,40 (1-2) CLOSED

JP 37,38,42 (2-3) CLOSED

iNTEL 486SL(DX,DX2,DX4)/DX4 OVERDRIVE CPU

JP 27,33,34,35,41 OPEN

JP 28,29,31 CLOSED

JP 30,40 (3-4) CLOSED

JP 32 (2-3),(4-5) CLOSED

JP 36,39 (1-2) CLOSED

JP 37,38 (2-3) CLOSED

JP 40 (3-4) CLOSED

JP 42 (1-2),(3-4) CLOSED

iNTEL P24T

JP 27,28,29,31,33 OPEN

JP 30,34,37,38 (2-3) CLOSED

JP 32 (2-3),(4-5) CLOSED

JP 35,36,39,41 (1-2) CLOSED

JP 40 (3-4),(5-6) CLOSED

JP 42 (1-2),(3-4) CLOSED

iNTEL 486 DX/DX2

JP 27,33,34,35,41 OPEN

JP 28,29,31 CLOSED

JP 30 (3-4) CLOSED

JP 32 (2-3),(4-5) CLOSED

JP 36,39,40 (1-2) CLOSED

JP 37,38 (2-3) CLOSED

JP 42 (1-2), (3-4) CLOSED

AMD 486 DX/DX2/DX4 (CPU CODE : NV8T)

JP 27,33,34,35,41 OPEN

JP 28,29,31 CLOSED

JP 30 (3-4) CLOSED

JP 32 (2-3),(4-5) CLOSED

JP 36 ,39,40 (1-2) CLOSED

JP 37 (2-3) CLOSED

JP 42 (1-2),(3-4) CLOSED

JP 38 (1-2) CLOSED FOR DX2 CPU USED

JP 38 (2-3) CLOSED FOR DX/DX4 CPU USED

AMD 486 DX2/DX4 ENHANCED (Plus) (CPU CODE : SV8B,SVBT)

JP 27,34,35,41 OPEN

JP 28,29,31 CLOSED

JP 30,40 (3-4) CLOSED

JP 32 (2-3),(4-5) CLOSED

JP 36,39 (1-2) CLOSED

JP 37 (2-3) CLOSED

JP 42 (1-2), (3-4) CLOSED

JP 33 OPEN FOR DX4 CPU USED

JP 33 (2-3) FOR DX2 CPU USED

JP 38 (1-2) CLOSED WHEN CPU INTERNAL CACHE IS WRITE THROUGH

JP 38(2-3) CLOSED WHEN CPU INTERNAL CACHE IS WRITE BACK