Intel MB886 user manual JP4 IDE DMA Mode Setting, JP6 Clear CMOS Contents

INSTALLATIONS

JP1, JP2, JP3: RS232/422/485 (COM2) Selection COM1 is fixed for RS-232 use only.

COM2 is selectable for RS232, RS-422 and RS-485. COM3 and COM4 are fixed for RS-232 use only. The following table describes the jumper settings for COM2 selection.

COM2	RS-232
Function
	JP1:
Jumper	1-2
Setting	JP2:
(pin closed)	3-5 & 4-6
	JP3:
	3-5 & 4-6

RS-422

JP1:

3-4

JP2:

1-3 & 2-4

JP3:

1-3 & 2-4

RS-485

JP1:

5-6

JP2:

1-3 & 2-4

JP3:

1-3 & 2-4

JP4: IDE DMA Mode Setting

JP4

Setting

Function

Pin 1-2	UDMA66 (default)
Short/Closed
Pin 2-3	Forced UDMA33
Short/Closed

JP6: Clear CMOS Contents

Use JP6, a 3-pin header, to clear the CMOS contents. Note that the ATX-power connector should be disconnected from the motherboard before clearing CMOS.

JP6

Setting

Function

Pin 1-2	Normal
Short/Closed
Pin 2-3	Clear CMOS
Short/Closed

10 MB886 User’s Manual