Biostar MB-8433UUD Jumper Settings

Biostar MB-8433UUD Jumper Settings

Line drawing of MB-8433UUD
  1. JP1 - Connectors
  2. JP5, JP6, JP7 - Cache RAM Size Select
  3. JP8, JP9 - ECP DMA Channel Select
  4. JP13 - ROM Type Select
  5. JP16 - CPU Clock Select
  6. JP37, JP39 - CPU Voltage Select
  7. JP42 - CMOS Discharge
  8. JP11, JP31, JP45, JP46, RN11-RN15 - CPU Type

Some jumper settings:

JP8, JP9 - ECP DMA Channel Select
DMA Channel JP8 JP9
1 1-2 1-2
3 2-3 2-3

JP13 - ROM Type Select
ROM Type JP13
SSC (+5V) 1-2
Intel (+12V) 2-3
EPROM open

JP42 - CMOS Discharge
Function JP42
Normal 2-3
Discharge 3-4


An external battery may also be attached to JP42. Attach the positive wire (+) to pin 1 and the negative wire (-) to pin 4. I'm not sure of the battery type or voltage to use. Note that my MB8433UUD has no pins for JP42, just solder pads.

JP5, JP6, JP7 - Cache RAM Size Select
SRAM Size JP5 JP6 JP7
128k
(32k x 4) 		1-2 open open
256k
(64k x 4) 		1-2 1-2 1-2
256k
(32k x 8) 		2-3 1-2 open
512k
(64k x 8) 		1-2 closed closed

JP15, JP16 - CPU Clock Select
CPU Clock JP15 JP16
25MHz open open
33MHz closed closed
40MHz open closed

JP36, JP37, JP39 - CPU Voltage Select
CPU Voltage JP36 JP37 JP39
3.45V 2-3 2-3 2-3
4V 2-3 1-2 2-3
5V 1-2 2-3 1-2

JP10, JP11, JP31, JP45, JP46, RN11-RN15 - CPU Type Select
CPU Type JP10 JP31 JP45 JP46 RN12 RN13 RN14 RN15
Intel 486 DX/DX2 1-2 open 2-3 1-2, 4-5 open open closed closed
AMD 486 DX2 1-2 open 2-3, 5-6 1-2, 4-5 open open closed closed
AMD 486 DX/DX4 1-2 open 2-3, 5-6 1-2, 4-5 open open closed closed
AMD Enhanced 486 DX2 1-2 open 1-2, 4-5 1-2, 4-5 open open closed closed
AMD Enhanced 486 DX/DX4 1-2 open 1-2 1-2, 4-5 open open closed closed
AMD 5x86-P75 1-2 open 1-2, 4-5 1-2, 4-5 open open closed closed
Intel P24D 1-2 open 1-2 1-2, 4-5 open open closed closed
Intel Pentium Overdrive P24T 1-2 open 1-2 2-3, 4-5 open open closed closed
Intel 486 DX4-S P24C 1-2 open 1-2 1-2, 4-5 open open closed closed
Cyrix 486 DX/DX2/DX4 M7 2-3 open 1-2 1-2, 4-5 closed closed open open
Cyrix 486 DX4-100 2-3 closed 1-2 1-2, 4-5 open open closed closed
Cyrix 5x86 M1SC 1-2 open 1-2 1-2, 4-5 open open closed closed

Jumper Notes:

CPU Notes:

JP1 - Connectors
Pin 14 15 16 17 18 19 20 21 22 23 24 25 26
Signal + - N/C CTR GND N/C - + N/C CTR GND VCC GND
Wire Green LED N/C Green SW N/C HDD LED N/C Turbo SW Reset

Pin 01 02 03 04 05 06 07 08 09 10 11 12 13
Signal CTR N/C GND VCC + N/C GND CTR GND - + CTR GND
Wire Speaker PWR LED & Key Lock Turbo LED Reset
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Last updated: 11/6/96

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