MANUAIS DE MOTHERBOARDS BIOTEQ

MB-14XXFA
25/33 mhz zero-wait 80486 Turbo Main Board

MAINBOARD LAYOUT

JP E : Fuse Enable/Disable Select
open : Fuse Enable
close : Fuse Disable

JP 3 : 8042 TURBO Control Pin Select
1-3 Closed : 8042 Pin 23
2-4 Closed : 8042 Pin 30

JP 4 : MONITOR TYPE SELECTION
open : Mono
Closed : Color

JP 7 : CHIP TYPE SELECTION
open : 146818 used
closed : Dallas used

JP 10 CPU Type Selection

80486DX2

80486DX

80486SX

80487SX

1-12 Closed
2-11 Closed
4-9 Closed

1-12 Closed
2-11 Closed
4-9 Closed

3-10 Closed

1-12 Closed
2-11 Closed
5-8 Closed

JP 11 CMOS DISCHARGE
1-3 Closed Clear Cmos Setup Memory
2-4 Closed Keep Cmos Data (Default)
Afer clearing cmos put the jumper back on 2-4 else the system doesn't boot up.

JP 15 : 3.6 V Battery Enable/Disable
open : External battery enable
closed : 3.6 Internal battery enable

CONNECTORS :

JP 17 External 6 Volt battery
1 : +
2 : NC
3 : NC
4 : Ground

CPU SPEED / OSC COMBINATION :
When using 486 25/50 Mhz Install 25Mhz Oscillator
When using 486 33/66 Mhz Install 33Mhz Oscillator